https://github.com/maximan3000/caesarcipher

Java library that implements Caesar Cipher (Keyed Caesar)
https://github.com/maximan3000/caesarcipher

caesar-cipher caesar-cipher-algorithm encryption java java-library maven

Last synced: about 1 month ago
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Java library that implements Caesar Cipher (Keyed Caesar)

• Host: GitHub
• URL: https://github.com/maximan3000/caesarcipher
• Owner: maximan3000
• License: mit
• Created: 2018-09-09T20:42:48.000Z (about 6 years ago)
• Default Branch: master
• Last Pushed: 2020-10-13T12:32:49.000Z (about 4 years ago)
• Last Synced: 2024-10-12T09:20:26.878Z (about 1 month ago)
• Topics: caesar-cipher, caesar-cipher-algorithm, encryption, java, java-library, maven
• Language: Java
• Homepage:
• Size: 3.68 MB
• Stars: 3
• Watchers: 1
• Forks: 2
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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# Caesar Cipher (Keyed Caesar) java library

Java library for Ceasar Cipher (Keyed Caesar) that can:

1. Encrypt & decrypt english text using keyword and keyword offset (shift)

2. Hack encrypted english text using frequency of letters and dictionary of words

## Requirements

* Java JDK 1.8 or later

## Installation

#### Maven users

```

  com.github.maximan3000

  caesar-cipher

  1.0.0

```

#### Gradle Groovy DSL

```

implementation 'com.github.maximan3000:caesar-cipher:1.0.0'

```

## Algorithm

* [Read it on wikipedia.org](https://en.wikipedia.org/wiki/Caesar_cipher)

## Usage

#### Encrypt/Decrypt text

Create an encryption system instance

```java

import com.grayen.encryption.caesar.algorithm.Caesar;

import com.grayen.encryption.caesar.algorithm.implementation.CaesarFabric;

Caesar encryption = CaesarFabric.getEncryptionSystem();

```

Encrypt text using your keywords and offset or it's default values

```java

String textToEncrypt = "Text need to encrypt";

String encryptedText = encryption.encrypt(textToEncrypt, "keyword", 5);

```

Decrypt with the same way

```java

String textToDecrypt = "Xcyx pccb xq cpauwsx";

String decryptedText = encryption.decrypt(textToDecrypt, "keyword", 5);

```

#### Hack text

Hack system uses dictioanry with english words to improve hacking quality.

So you need to create string array with many words.

To do that, download large book with .txt extention and parse it to string[].

```java

import java.nio.file.FileSystems;

import java.nio.charset.StandardCharsets;

import java.nio.file.Path;

import java.nio.file.Files;

Path sourceFile = FileSystems.getDefault().getPath("BigBook.txt");

List fileLines = Files.readAllLines(sourceFile, StandardCharsets.UTF_8);

String[] dictionary = fileLines.toArray(new String[0]);

```

Create hack system instance. 

* Note 1: successful hack depends on encrypted text size

* Note 2: text for dictionary should be large

```java

import com.grayen.encryption.caesar.hack.Hack;

import com.grayen.encryption.caesar.hack.implementation.HackFactory;

Hack hack = HackFactory.getCaesarEncryptionHack(encryptedText, dictionary);

```

Hack encrypted text

```java

String hackedText = hack.hack();

```

If it's need, correct hacked text with hands and hack the text again

```java

hack.correctEncryptionTableWithHand("a", "x");

String hackedText = hack.hack();

```