In this article, I will guide you to create enemies for our characters with Godot game programmer. Enemies will cause the character to lose blood or you have to fight the enemy. And this part has some parts that can be very difficult and unsuccessful, so be prepared.

And let’s get started.

Creating Enemies in Godot

First we will create a button KinematicBody2D change name to enemy. LIVE enemy > more AnimatedSprite because it is of form 1 and Collision gives it as normal.

If you are using anonyviet’s assets, there are enemy assets at: asset-player > NPC > enemy assets

Asset download link

You can choose any one.

Create SpriteFrame new

Create Animation is move

Here is the blurry picture, please re-import it

I have re-imported it and it looks better

Next set collision for it, here I set below not set above so that the upper part can let the character jump up and destroy it.

Lock it and create a new script and this script will be named enemy

We will create the following variables

const vitri = 1
const chuyendong = vector2
const tocdo = tùy bạn
const trongluc = tùy bạn
const  FLOOR = Vector2(0,-1)

here const is the statement used to lock the number, that is, when you declare a variable with const, it will lock that number and never be able to edit its value.

Physical motion code

Next we will create a physical motion function

And will code like this

Assign change the x-axis = with tocdo * with vitri (* leave positive speed on the right and negative speed on the left)

Call the animation just created above: $AnimatedSprite.play(“tênanmation’)

Assign chuyendong trục y += trongluc

And call the move_and_slide command so that the enemy can move.

And here we will need a function for the enemy to detect the wall and it will move in reverse.

For example: The enemy moves to the wall, then detects that wall and then it will move back. It’s like when you reach the wall, you will simply turn around.

And we will use the if statement to check the wall: if is_on_wall():

inside if wall would be: vitri = vitri * -1

Above you have seen tocdo * vitri then positive speed is on the right and negative speed will be on the left when vitri * with -1 then it will reverse and the enemy will move in reverse when hitting the wall and right again vice versa.

And it was successful, but you notice that our enemy doesn’t change direction but stays in one direction and now we will correct it.

You code like this

if vitri == 1: (vitri = 1 = positive number where positive = move to the right)

$AnimatedSprite.flip_h = false (flip_h is the command used to rotate the sprite to the right or left)

else: (opposite of above)

$AnimatedSprite.flip_h = true (flip_h = false is it won’t rotate will stay the same,true = vice versa)

And it moved backwards

Ok so that’s the end of part 1, creating enemies for the character. Part 2 will help you code the enemy to move back and forth on the map as shown below

When you make those blocks the enemies won’t move back and forth and that’s why there will be Part 2

And Part 3 will help you create, hp, damage for the enemy ^^.

In this article, I will guide you to create enemies for our characters with Godot game programmer. Enemies will cause the character to lose blood or you have to fight the enemy. And this part has some parts that can be very difficult and unsuccessful, so be prepared.

And let’s get started.

Create an enemy

First create a new Sense and include the 2D kinematicbody the child node is AnimatedSprite and CollsionShape2D then press Ctrl + WILL save.

If you are using anonyviet’s assets, there are enemy assets at: asset-player > NPC > enemy assets

Asset download link

You can choose any one.

Create a new SpriteFrame

Creating Animation is a move

If the photo is blurry, you guys Import come back

Next set collision for it, here I set the lower part not the upper one so that the upper part can let the character jump and destroy it

Lock it and create a new script and this script will be named enemy

We will create the following variables

var Vitri = 1
var  vantoc = Vector2.ZERO //hoặc Vector2() đều giống như nhau
var  Tocdo = tùy bạn
var Trongluc = tùy bạn
var  FLOOR = Vector2(0,-1)

here const is the statement used to lock the number, that is, when you declare a variable with const, it will lock the number and never be able to modify its value.

Next we will create a physical motion function

And will code like this

Assign gravity to it

vantoc.y  =  trongluc

Assign speed to it

vantoc.x  += tocdo * delta * vitri (Here * delta to reduce enemy speed)

Add move_and_slide statement to be able to move

vantoc = move_and_slide(vantoc)

Next you will instance it outside of our sence:

And instance it out

Run the game and you will see it move

Here, I set the collection mode to see it, so there’s nothing wrong

Next we will code so it can move left, and animation

And here I will have 1 command is:

if is_on_wall() : is_on_wall() is a statement that returns true if the Body is on the Wall, and it only executes when called with move_and_slide

And next below if is_on_wall() we will add one more line of code:

vitri = vitri * -1 and this line when touching something vitri is 1 then it will * -1 and it will move backwards

Oh and if you run the game and see that the character is running slowly, check if move_and_slide has FLOOR, if not, add it if it is but still slow, adjust the speed to about 20-30

And next we will code the animation for it

if vitri == 1:
$AnimatedSprite.flip_h = false
else:
$AnimatedSprite.flip_h = true

The above 2 lines are the 2 lines that will change the image of the enemy, flip_h = false the picture will flip to the right flip_h = true is to the left

if vitri == 1 : means that the position is equal to 1 but = 1, it will move to the right but our enemy moves to the right first, so flip_h will = false

And vice versa

Then please call animation move for me

$AnimatedSprite.play("Move")

Mine is fine after running the game

And in the next post, I will guide you to create raycast so that the enemy can move on the tilemap as shown below without dropping.

In this article, I will guide you to create raycast2D so that the enemy can move on the terrain as shown below without falling down. And let’s get started

RAYCAST2D EASY

Here Raycast 2D is 1 node: Query object intersecting ray means Raycast 2D is 1 ray and this ray is used to query object when intersecting ray

ENEMY

Next is the enemy you enter the enemy’s sence

Find yourself raycast2D

And be like this

Here you do not use the mouse but use the right arrow key to move it to the edge collsionshape

And almost as open as me

On the side of the nature, pay attention to yourself Enable and Cast to

live Enabled you click for yourself and raycast will turn blue

LIVE cast to part y you cast it close under the enemy

Like the picture, this enemy is too small so I’ll adjust the scale raycast wall 0.5, 0.5

And after adjusting the scale, you also have to adjust the other part

Next we will code it

And Coding for me

Below if is_on_wall

You add yourself as

if $Raycast2D.is_collding == false:

vitri = vitri * -1

Here $Raycat2D is called raycast2d || is_collecting is the command: Returns whether any object is intersecting the vector ray which here we attach = false means it will not intersect at all.

And vitri = vitri * -1 here means the enemy will move in reverse when on the terrain that I mentioned at the beginning of the article

And you notice when it has moved back but this raycast2D it doesn’t move back anymore so we need to adjust it.

You add $RayCast2D.position.x *= -1 into the if is_on_wall and raycast collecting Please

This is the help command Raycast 2D can change direction and you can apply to other nodes like collsionshape etc

It is done

And remember to delete *delta let’s go

If the code does not run, the code is as below

1. Brute Force Attack

This is a type of attack where you will “find” all possible combinations of characters until there is a combination of characters that matches the character combination used as the password. This attack method helps us to see clearly the core strength of the password.

2. Dictionary Attack
The problem with Brute Force Attack is that “finding” all “all” combinations takes me “time”. So the Dictionary Attack technique was born. This technique replaces the bluffing act of “guessing” with the calculated “guessing” action.
You can get a rough understanding of this attack method based on its own name “Dictionary” or “dictionary”, or in short you have a list of combinations of characters that are “highly likely” to be a password. Then check to see if there is a password in that list.

3. Hacker, Attacker, Script Kiddies and Cracker
– Hackers: People who perform intrusion and hack, People who are very good at Technology, Lun wants to follow a new path, Infiltrate the system and modify the nature and working state of the system.
– Attackers: People who use hacker inventions and attack the system
– Script Kiddies: People who want to attack the system or secure it, but only know how to use tools or the above 2 types to detect it without caring what their nature is.
– Crackers: WOMENpeople who belong to a school of hacking, specialized in cracking and knowledgeable about cryptography

4. Bugs, exploits
– Bug: is roughly understood as a hole
– exploit: For simplicity, an Exploit is a program that will exploit a bug (vulnerability) in a certain software. All exploits are different, they do different things with different bugs, that’s why exploits are always certain programs.
Exploits will give you the opportunity to gain root privileges on different operating systems (Windows/Linux…) by exploiting a vulnerability in the software when the software runs as root.

*** Surely among us, many people have heard no less than 1 time the concept of “Keylogger”. Although it can be vaguely perceived as dangerous, a powerful tool can help bad guys steal the information we enter from the keyboard. But can you confidently say that you completely understand this tool?
Let’s take a look at learning about Keyloggger, from which to draw the most effective self-protection experience.

How does the keylogger penetrate the machine?

A keylogger is usually a small piece of software (a form of covert channel for Trojans) – or sometimes more dangerous even a hardware device – with the ability to record every keystroke the user presses on the keyboard. Combining the results of these keystrokes, the keylogger installer can obtain private messages, email content, credit card numbers and, most dangerously, any type of user password.

In most cases, keyloggers are “silently installed” by malware on users’ computers after successfully infiltrating them. Some other less common cases are when parents want to control the access of their children, when the managers of a company want to check the working attitude of employees or … couples want to monitor each other. . In Vietnam, we sometimes hear about keyloggers lying in the machines of the net stores – not because the machine is infected with malware, but because someone wants to “test their skills”, some people even let them know. that it is the innkeepers who direct this. The truth of the rumors as well as the legitimacy of cases that touch personal privacy – even when parents want to spy on their children is still a matter of debate. But the need to manage employees of large organizations through keyloggers is real, and there are even lines of specialized hardware products for this job.

As mentioned above, most keyloggers on popular computers are distributed through malware. If the user’s computer has been compromised, this piece of malicious code can have the function of a compact keylogger software – or it can act as a Trojan, downloading and installing the keylogger package. silently, even with many other malicious software. Often the malware will also automatically set up a channel to send the information that the keylogger collects to the “owner”. It can be said that keyloggers are one of the most popular tools for hackers because they can obtain all kinds of user information using this method.

In addition to the malware intrusion channel, most of the remaining keylogger infections come from our relatives. The two most easily related subjects, as mentioned earlier, are of course parents and… lovers (or spouses). Parents who feel the need to carefully control their child’s access to the vast Internet of the world often use packages of parental controls, where it’s usually not difficult to find functionality similar to keyloggers. . And of course, in today’s online world, a jealous girl with a little English will take less than 30 minutes for Google to release a keylogger (or even more multifunctional software) to monitor. See if you can sneakily “eat pho” outside.

And in the case of bosses who direct the installation of keyloggers on employees’ machines, it should be remembered that analyzing the results obtained by keyloggers, especially with a large number of machines, is not a small effort and resource. . In most cases, if you find that you are “in the spotlight”, check yourself to see if you have done anything to be placed in the category of “suspect” to disclose information of the company or not. The laws related to this tracking also vary by country and geographic region. At the same time, some companies also require employees not to work personally in an office environment, so such tracking is still considered by some to be legal and reasonable – because, anyway, if you enter individuals on these machines means that the employee himself has violated the regulations, can not blame anyone else.

Hardware keylogger (see illustration)

With the advancement of technology today, creating a keylogger in the form of a hardware device is no longer too difficult. As we all know, the PC keyboard is usually connected to the case via a USB cable (or some models still use the PS2 port). Connecting dedicated keylogger hardware is as simple as disconnecting the keyboard from the case, plugging in the compact keylogger device. This device is of course then serialized to the case to ensure that the user can still enter data normally without any detection, especially in some office environments where the case is normally closed. It’s closed and sometimes only IT staff have the key to access. Even in the net shop, or for careless users who never touch the dusty case under their desk, this method is still very effective. With this approach, no security software installed on the computer can help us detect that the input data from the keyboard is being recorded silently, because this device does not notify the operating system. about its presence.

Although usually does not have the advantage of software installed by malware that can send data obtained over the network. But the person who installs the keylogger device just needs to come back for a few days, unplug the device and plug the keyboard back in to have a relatively large amount of user data in hand. The most important thing is that it does not leave any “soft” traces that security software, connection analysis, etc. can detect.

Sometimes, these devices can even be disguised as adapters that look very “gentle” like in the photo above.

How it works

Keylogger in the form of software often runs in the background on the computer, recording every keystroke that the user enters. Sometimes to avoid sending data so often that tracking is “noticed” by the user, these software packages can be designed to send only strings of data that appear useful – such as a string The number “looks” like a credit card code.

To increase efficiency, keyloggers are also often combined with some other type of tracking software, so that an intruder can distinguish the information that the user enters when chatting nonsense from the information entered. while logged in to your online banking account. The first string of characters a user enters after starting a “chat program, email client or online game” is also important – because this is usually the username and password string used to log into that service’s account. .

For cases that need to be “taken care of” more meticulously, the keylogger installer will often have to use a tool to scan through the entire log file to record everything the user has entered during the time being monitored. , from which to filter out information such as Google search content, comment in a certain topic … on the internet. Often, the monitoring software packages provided for parents and offices also include a screen capture utility. Thereby providing full information and evidence of what the “victim” did during the use of the machine.

Protect yourself against keyloggers (see illustration)

At its core, keylogger software has always been classified as malicious code – malware. So we can detect keyloggers on the machine with commonly used scanning tools. Most importantly, choose the right security software – it doesn’t have to be powerful and expensive, it just needs to have a clear name and reputation. Avast, AVG, Avira all have free and effective solutions for general users. If you are not careful, it is possible that the software that assigns “anti-virus” or “anti-malware” that you indiscriminately downloaded from some source on the network is the culprit to install the keylogger on your computer, or more gently. then it will bring tons of bloatware – unwanted software – as well as annoying ads onto the device.

Avoid Keyloggers

first). If you are really worried and unsure about the existence of keyloggers or beyond, the management software installed on your computer by others, it is best to always take advantage of the virtual keyboard function available on the services. banking services, online payment channels or online games. Don’t let a beautiful day after logging into the game be indignant to realize that your character has been “undressed”, while the culprit is not a stranger but the parents…
2). Here is a trick to break “Keylogger” in Windows 10 (Disable KeyLogger on Windows 10)
1. Run CMD with Admin rights
2. Enter the following commands in turn:

sc delete DiagTrack
sc delete dmwappushservice
echo "" > C:\ProgramData\Microsoft\Diagnosis\ETLLogs\AutoLogger\AutoLogger-Diagtrack-Listener.etl

Trojans and Backdoors are two methods that hackers use to illegally infiltrate the target system. They have different states, but have one thing in common: The hacker must install another program on the target computer, or the user is tricked into installing a Trojan or Backdoor program on their computer. .

1. Trojan
Trojan A type of malicious code named after the legend of “Trojan Horse”. A Trojan is a program which contains dangerous and malicious code hidden in the form of good data but the program appears to be innocuous as far as this feature it can control and cause harm, for example opening a distribute files in your hard disk.

2. Backdoors
A backdoor is a program (program) or related to a program, used by a hacker to install on the target system, in order to give him back access to the system at a later time. The purpose of the backdoor is to verifiably remove the logging system. It also helps hackers to stay in access status when detected by the administrator and find a way to fix it.

3. The purpose of the trojan
• Steal information such as passwords, credit card security code information using keylogers
• Using the victim’s computer to create a botnet (ghost computer network) to perform DDOS attacks
• Delete or replace important system files
• Create a fake connection to attack DOS
• Download Spyware Adwares and Malicious Files
• Disable firewalls and anti-virus software
• Screen capture, audio recording, screen recording of the victim’s device
• infect the victim’s PC as a proxy server for relay attacks
• Using the victim’s computer to spread spam and mail bombs

4. Recognizing a Trojan Attack

5. Ports used by popular trojans

How to use netstat -an command in CMD mode to see the status of ports?

6. How are Trojans deployed?

7. How does the Trojan infect?

8. Classification of trojans

a. Command shell Trojan

• The Trojan Shell command allows remote control of the shell command on the victim’s computer

• The Trojan server is installed on the victim’s machine, in which it opens a port for the Attacker to connect to.

A workstation is on the Attacker’s machine, where it is used to run shell commands on the victim’s computer

b. Email Trojans

• Attacker remotely controls the victim’s computer by sending an email

• Attacker can get files or folders by sending commands via email

• Attacker opens SMTP relay server and spoofs email from a field to hide the origin

c. Botnet Trojans

• The botnet Trojan infects a large number of computers over a large geographical area, creating a network of bots controlled through a central Command and Control (C&C)

• Botnets are used to launch a variety of attacks on a victim including denial of service attacks, spamming, click fraud and financial information theft

d. Proxy server Trojans

• Trojan Proxy is commonly used as an application that allows a remote attacker to use the victim’s computer as a proxy to connect to the Internet.

• Proxy server Trojan, when infected, starts hiding a Proxy server on the victim’s computer

• Thousands of computers on the Internet are infected with Proxy servers using this technique

e. FTP Trojans

• FTP Trojans install FTP server on victim machine, it opens FTP port

• Attacker can connect to the victim’s machine using the FTP port to download any file that exists on the victim’s computer.

f. VNC Trojans

The VNC Trojan starts a VNC Server daemon on the infected system. It connects to the victim using any VNC viewer with the password “secret”. When the VNC program is scrutinized, the Trojan will never be detected by the anti-virus.

g. HTTP/HTTPS Trojans

• HTTP Trojan can bypass any firewall and work under the reverse of an HTTP tunnel

• They are executed on the local host and then self-replicate in a pre-calculated cycle

• Subroutine appears to the firewall user thus allowing Internet access

H. Remote Access Trojan

The Trojan works like accessing Remote Desktop. Hacker takes over all GUI to access remote system

• Infects computer(Rebecca’s) with server.exe and back-connecting Trojan

• Trojan connects to port 80 so that the Russian attacker establishes a reverse connection

• Jason, the attacker, has full control of Rebecca’s machine

i. . E-banking Trojans

E-Banking Trojan Intercepts the victim’s account information before it is encrypted and sends Trojan commands to the attacker’s control center.

k. Destructive Trojans

• This is a dangerous and destructive type of Trojans

• When executed this Trojans destroy the operating system

• Trojans format all local and network drives

• User will not be able to boot the operating system

l. Encryption Trojans

• Encryption Trojan: encrypts data files in the victim’s system and makes the information unusable

• Attackers ask for a ransom or manpower to make purchases from their online drug stores in return for the password to unlock

9. Detect trojans

10. Countermeasures against Trojan

• Avoid downloading and executing applications from untrusted sources

• Avoid opening email attachments received from unknown senders

• Install patches and security updates for operating systems and applications

• Scan CDs and floppy disks with anti-virus software before use

• Avoid accepting instant messaging schemes

• Block all unnecessary ports at servers and firewalls

• When hardware is weak, Set default configuration

• Disable unused functions including protocols and services

• Avoid typing commands blindly and execute pre-made programs or scripts

• Monitor intranet traffic for odd ports or encrypt traffic

• Workstation local file integrity management through checksums, audits, and port scans

• Run versions of anti-virus, firewall, and intrusion detection software

• Restrict access in the desktop environment to prevent malicious applications from installingat on

11. Countermeasures against backdoors

12. Penetration testing

UG is Under Ground, only those who specialize in stealing other people’s bank cards for personal use (purchases, top-ups, …..). At that time, the bank cards they stole were called CC temple

What is CC temple?

As I said above, cc is a bank card that hackers can steal for personal use

Eg: A certain Mr. A has stolen Mr. B’s bank card to buy things at store C. When paying, Mr. A will use Mr. B’s bank card. As a result, Mr. A can buy goods without losing VND. Come on, and Mr. B has both lost money and gained nothing

How to distinguish?

Information of 1 cc includes:

• CC number: Includes 16 digits (Only American Express has 15 digits)
• If the first number is 4 -> visa card
• If the first number is 5 -> Mastercard
• If the first number is 6 -> Discover card (I see very little of this type)
• CVN (short for Card Verification Number) consists of 3 digits
• Zip Code: In the US there will be 5 digits. In other countries, you can go online

Payment gateways can only check CC number, CVN and Zip Code, the rest you can make up

Other parameters:
Name on card : cardholder’s name
Expired date: expiration date
Address: address
City: city
State: bang
Country: country
Telephone number: phone number

I checked this pile of cc 2, 3 days ago, I don’t know if any of them are still alive.

Note: View information for research purposes only. Please do not use other people’s money for personal purposes

Live |> |United States|43885761909466|09|2019|430|Joseph|Nunes||14718 Sutton Street|Sherman Oaks|California|91403|||jnunes@marshall.usc.edu|
Live |> |United States|4847187409691064|10|2023|127|Elsy|Gutierrez||1200 woods chapel road|Greer|South Carolina|29334|||Ateamer@lear.com|
Live |> |United States|4388576022170677|03|2019|748|Christine|Rush||9 Donnybrook Rd|Montvale|New Jersey|07645|||crush@movadogroup.com|
Live |> |United States|4266841477443350|06|2019|592|Katherine|McLaughlin||PO BOX 959|Marysville|Washington|98270|||mclaughlin.k@frontier.com|
Live |> |United States|5172790021674335|07|2019|835|Cieada|Russell||885 Douhet dr box 18|Barksdale AFB|Louisiana|71110|||ciciruss22@gmail.com|
Live |> |United States|4266841493834624|10|2019|521|Hannah|Smith||29825 Grand Blvd.|Wickliffe|Ohio|44092|||Moomoo1of7@yahoo.com|
Live |> |United States|4147400156676072|04|2019|973|Garcia|Smith||8049 Pantano Place|Alexandria|Virginia|22309|||GarciaCSmith@Hotmail.Com|
Live |> |United States|4388576092714883|12|2018|479|Kelly|Marsh||1521 Crestline Drive|Santa Barbara|California|93105|+1 805-563-1100||
Live |> |United States|4147098852142793|12|17|835|Glenn|Backes||2916 FRANKLIN BLVD|SACRAMENTO|California|95818-3516|9162022538|||

In part 2, I will show you how to read, hack, and check cc

I have met a lot of people who have just started hearing about hacking, so I find it interesting and interesting. Someone asked me how to hack. The important thing here is that you need to learn general knowledge about hacking. You need to know the acronyms, the keywords that the seniors before them use, then you will gradually understand.

Here, I will share with you the basics of hacking for those of you who want to start the path of hacking, knowledge for beginners to learn. Note that I will not take any responsibility or bad things that you do.

This article is intended as a guide and reference for newbies. If you have experience, please try to help others. Do not quarrel, deliberately cause trouble to cause discord with brothers.

What do we need to start learning about hacking?

I’m sure many of you will disagree with me. But I advise you the best way is to use 9X operating system first. Then move on to the more powerful operating systems Linux and Unix respectively.

Here are the ones you should have:

• An OS, be it DOS, Windows 9X, Linux or Unix, etc.
• Find a good site.
• Should have a good web browser.
• Get a good chat tool.
• Telnet.
• The most important thing here is that you must know about programming languages ​​like C, C++, etc.

What is an IP address?

You can understand it like this: IP address is divided into 4 numbers limited from 0 – 255. Each number is stored by 1 byte so IP is 4 bytes in size. And IP is divided into address classes.

There are 3 classes, A, B and C. If in class A, we can have 16 million won address, in class B there are 65536 address. Eg: In class B with 132.25we have all the addresses from 132.25.0.0 arrive 132.25.255.255. Most Class A addresses are owned by companies or organizations.

An ISP usually owns several class B or C addresses. For example, if your IP address is 132.25.23.24 then you can identify your ISP (whose IP is 135.25.x.)

IP is an acronym for Internet Protocol. Each person will have a private IP address and it is unique on the Internet and it will represent that person. Furthermore, IP addresses are used by different computers and are used to identify computers connecting between them. This is the main reason you get banned by IRC and how people find out your IP.

Your IP address can be easily discovered by others in the following ways:

• Your IP will be logged when you surf a website.
• On IRC, anyone can detect your IP.
• If you chose ” Don’t show IP ” on ICQ and you think your IP will not be detected, you are wrong.
• When you are connecting to someone else, they can type “ systat -n ” and can always see who is connecting to them.
• They can get your IP by sending an email with a code that gets the IP.

How to find out my IP

• With Windows you just need to do the following: enter Command Prompttype ipconfig.
• LIVE mIRC: you need to connect to the server and type the command /dns.
• Alternatively, you can go through some websites that display IP

What is IP Spoofing?

There are several IPs used to uniquely identify a device in the world. From there a server can allow another device to exchange data back and forth without checking the server.

However it is possible to change your IP. That is, you send a fake information to another computer and that machine thinks that the information has just been received from a certain machine (not your machine). You can also bypass the server without having to have control over it.

You will have a problem that the response from the server will be sent to the device with the IP that we have spoofed. So you may not get the information you want back. Perhaps, Spoof IP is effective when you need to bypass firewalls, steal accounts and hide personal information.

Here is the Bonus part

Download

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AnonyViet-HanPhu

Coming to the next part of the series “Basic hacking knowledge should know”. In this part 2, I will share some more hacking knowledge for everyone. Hope these knowledge will help you learn more good things.

If you forgot some knowledge in the previous section, you can click Part 1 to read it again.

Basic knowledge of Trojan, worm, virus, logicbomb?

First of all, I want to briefly explain about these types. These are the same viruses that made history back in the day. You should find out if you don’t know yet! We will talk about them one by one to make it easier for you to imagine.

What are Trojans?

You can briefly understand this is a spy program that is installed on your computer to steal information. Then send everything back to its owner. Here, what it targets is stealing accounts, passwords or cookies, etc.

In general, it will give full control of the computer to its owner. They can gain access to control your computer or steal anything they want.

Talking about Viruses

A program that contains special code that is installed or spread from other computers to the victim’s computer. It is responsible for fulfilling the requirements of the code that its owner wrote. Often viruses will be used to destroy data and computers.

Worms are… ?

In short, a worm is a standalone program. It can replicate itself and spread throughout the network. Worms are also often used for the same purpose as viruses. It destroys data, destroys inside the network and more dangerously can bring down the entire network.

Finally, LogicBomb

A program that sends multiple packets of data at the same time to the same address. It will “fatigue” the system, block the transmission. Moreover, it is used as a tool to “terrorize” the enemy (bomb mail).

What is PGP?

” Pretty Good Privacy “also known as PGP for short. This is a tool that uses public key encryption to protect email data and records. PGP is a highly secure form of encryption that uses software for MS_DOS, VAX/VMS, Unix and for other forms

What are proxies?

In simple terms, a proxy is an Internet server that relays information and controls the security of Internet access, also known as Internet service clients. Proxy server is the installation station of the proxy. Proxy or proxy installation station has an IP address and a fixed access port.

You can understand is another computer that is responsible for processing data. It is like an information converter of the Internet signal. With the connection through 1 or more servers as above. Initially, the user’s computer sends the request signal through the proxy server. Here, that information will be processed and sent back to what you see every time you access the Internet.

Proxy allows users to access services on the Internet in a direct sense. With dual host homed, you need to login to the host before using a service on the Internet. Because proxies allow users to access Internet services from their personal systems. Therefore, it does not allow packets to go directly between the user system and the Internet. The path is either indirect through the dual homed host or through a combination of the Bastion host and the screening router.

What is Unix?

Unix is ​​a Windows-like operating system. It can run on many different computers including personal computers or service servers. It is a multitasking operating system and is written in the C programming language. And Unix is ​​also the operating system that hackers often use.

What is Telnet?

Telnet is a program that allows us to connect to another machine through a port (also called a port). Every computer or server has ports, here are some common ones:

• Port 21: FTP
• Port 23: Telnet

Eg: You can call Telnet to connect to mail.virgin.net on port 25 .

How do I know I have Telnet to the Unix system?

I will tell you how a Unix system can greet you when you connect to it. When you call Unix, it will normally appear with the line : ” Log in: “, (but with that alone, this is not necessarily Unix except they appear before the word “log in”)

We are now at the prompt.” log in: “, you need to enter a valid account. A normal account has 8 or more properties, after you enter the account you will see a password, please try to enter Default Password Try the following table:

What is a shell account?

A shell account allows you to use your home computer as a terminal with which you can type commands to another computer running Unix. “Shell” is the program that translates the characters you send and will be put into the execution of the Unix program’s command. With a correct shell account you can use a workstation far more powerful than you could ever imagine.

Here is the Bonus part

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