Classic Cryptography Algorithms

1. Bahasa Indonesia

Instalation

Gradle

Always check the latest version

allprojects {
  repositories {
   ...
   maven { url 'https://jitpack.io' }
  }
 }

dependencies {
    implementation 'com.github.MuhammadIqbalAfandi:Classic-Cryptography-Algorithm:0.2.0-alpha'
}

Customization & Samples

APIs for Atbash Cipher Encryption and Decryption

Class	Method	Description
VigenereCipher	encryption(plaintext: String, key: String): String	A function that produces text encryption.
VigenereCipher	decryption(ciphertext: String, key: String): String	Function that returns the original text.

APIs for Vigenere Cipher Encryption and Decryption

Class	Method	Description
AtbashCipher	encryption(plaintext: String): String	A function that produces text encryption.
AtbashCipher	decryption(ciphertext: String): String	Function that returns the original text.

APIs for Helpers

Class	Method	Description
Helpers	changeStringToAscii(string: String): MutableList	Change the string value to ascii value.
Helpers	changeAsciiToString(asciiArray: MutableList): String	Change the ascii value to string value.
Helpers	checkAsciiCharacterSupported(ascii: Int): Boolean	Check whether the ascii value is the same as the supported ascii value.
Helpers	getCharacterValue(index: Int): Int	Retrieve character values based on index value.
Helpers	getIndexValue(ascii: Int): Int	Take the character index value.
Helpers	removeSpace(string: String): String	Removes spaces in the text.
Helpers	repeatKeyWithKey(key: String, plaintext: String): String	Repeat the key as much as the text to be encrypted.
Helpers	repeatKeyWithPlaintext(key: String, plaintext: String): String	Repeat the key as much as the text to be encrypted by adding the plaintext value to the key.
Helpers	modulus(n: Int, m: Int): Int	Modulus

Samples

Kotlin:

val plaintext = "ATTACKATDAWN"
val key = "LEMONLEMONLE"
val vigenereEncryptionResult = VigenereCipher.encryption(plaintext, key)
val vigenereDecryptionResult = VigenereCipher.decryption(vigenereEncryptionResult, key)
println("Encryption ->")
println(vigenereEncryptionResult)
println("Decryption ->")
println(vigenereDecryptionResult)

val atbashEncryptionResult = AtbashCipher.encryption(plaintext)
val atbashDecryptionResult = AtbashCipher.decryption(atbashEncryptionResult)
println("Encryption ->")
println(atbashEncryptionResult)
println("Decryption ->")
println(atbashDecryptionResult)

kotlin:

val text = "Kotlin Awesome"
val asciiValue = Helpers.changeStringToAscii(text)
println(asciiValue)

List Of Character Supported

"!\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\ ^_`abcdefghijklmnopqrstuvwxyz{|}~"

Supported Character Index Values

!  "  #  $  %  &  '  (  )  *  +   ,   -   .   /   0   1   2   3   4   5   6   7   8   9   :   ;   <   =   >   ?   @   A   B   C   D   E

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F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z  [  \  ]  ^  _  `  a  b  c  d  e  f  g

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h  i  j  k  l  m  n  o  p  q  r  s  t  u  v  w  x  y  z  {  |  }  ~

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How to Process Encryption and Decryption of Vigenere Cipher and Atbash Cipher in Applications

1. Check each plaintext character (original text), what is the plaintext character included in the characters that are supported for encryption, please see here what characters can be encrypted.

2. Encrypt every supported plaintext character, by searching the index value of each plaintext character please see here to see values index of each character, after getting the character index value input into the formula we get the character index value already in encryption, because the value is still in the form of an index take the character value based on the index you can see here. The same thing applies to decryption.