# encrypt-me

> Contains function for encryption and decryption using techniques

Latest version **1.0.0** (published 2021-01-23) · ISC license · 0 weekly downloads

## Install

```sh
npm install encrypt-me
pnpm add encrypt-me
yarn add encrypt-me
bun add encrypt-me
```

## Health

**Score 15/100 (F)** — status: abandoned.

Positive: no vulnerabilities.

Warnings: low downloads; no types; no esm support.

Negative: abandoned; low maintenance score.

## Facts

| | |
|---|---|
| Version | 1.0.0 |
| Published | 2021-01-23 |
| First published | 2021-01-23 |
| Weekly downloads | 0 |
| License | ISC |
| TypeScript types | none |
| Module format | CommonJS |
| Dependencies | 1 |
| Unpacked size | 35.4 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| GitHub stars | 0 |
| Author | Dev Baweja |
| Maintainers | devbaweja |
| Keywords | encrypt, decrypt, encryption, decryption |

## Links

- npm: https://www.npmjs.com/package/encrypt-me
- Repository: https://github.com/DevBaweja/Encrypt-Me
- Homepage: https://github.com/DevBaweja/Encrypt-Me#readme
- Issues: https://github.com/DevBaweja/Encrypt-Me/issues
- npm.io page: https://npm.io/package/encrypt-me

## Dependencies (1)

- [ascii-table](https://npm.io/package/ascii-table.md) 0.0.9

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## Recent versions

- 1.0.0 (latest) — 2021-01-23

## README

# Encrypt-Me

### Abbr:

```
PT - Plain Text
CT - Cipher Text
Ek - Encryption Function
Dk - Decryption Function
k - Key
```

### Encryption and Decryption

```
CT = Ek(PT)
PT = Dk(CT)
```

# 1. Mono Alphabetic Cipher -

A monoalphabetic cipher is any cipher in which the letters of the plain text are mapped to cipher text letters based on a single alphabetic key.
One to One Mapping

-   ## Additional Cipher

src/additional-cipher.js

### Functions:

    encrypt(plain,key):cipher
    CT = (PT + k) mod 26
    decrypt(cipher,key):plain
    PT = (CT - k) mod 26

### Requirements:

    Key must have additional inverse

### Key Domain : [0-25] ie 26

    k - 26 keys only
    including zero as key in that case we will have
    same plain and cipher text

-   ## Multiplication Cipher

src/multiplication-cipher.js

### Functions:

    encrypt(plain,key):cipher
    CT = (PT x k) mod 26
    decrypt(cipher,key):plain
    PT = (CT x inv(k)) mod 26

### Requirements:

    k x inv(k) mod 26 = 1
    Key inverse must exists

### Key Domain : 12

    k - 12 Keys only with Key inverse
    including one as key in that case we will have
    same plain and cipher text

## 3. Affine Cipher

src/multiplication-cipher.js

### Functions:

    encrypt(plain, key: {kadd, kmul}):cipher
    CT = ((PT x kmul) + kadd) mod 26

    decrypt(cipher, key: {kadd, kmul}):plain
    PT = ((CT - kadd) x inv(kmul)) mod 26

### Requirements:

    kadd - Additional Cipher Key
    kmul - Multiplication Cipher Key
    kmul x inv(kmul) mod 26 = 1
    Key inverse must exists

### Key Domain : 26 x 12 = 312

    kadd - 26 values
    kmul - 12 values

## 4. Monoalphabetic Cipher

src/monoalphabetic-cipher.js

### Functions:

    encrypt(plain, key):cipher
    CT = key[PT]

    decrypt(cipher, key):plain
    PT = inv(key)[CT]

### Requirements:

    key - Key of length 26 containing all the alphabetic only once
    ie It is mapping of between plain characters and cipher characters

### Key Domain : 26!

    Quite large key domain, so brute force attack is not feasible.

## 5. Autokey Cipher

src/autokey-cipher.js

### Functions:

    encrypt(plain, primer): cipher
    CT(i) = (PT(i) + key(i)) mod 26

    decrypt(cipher, primer): plain
    PT(i) = (CT(i) - key(i)) mod 26

### Requirements:

    key - Key is any alphabetic character.
    Encryption - New Key is generated by primer at its initial and merging the plain text stream. 
    Decryption - New Key is generated by primer at its initial and from tabula rectat stream continues. 


### Key Domain : Depends upon primer size n ^ size of primer

    Since only initial primer is to guessed.

## 5. Playfair Cipher

src/playfair-cipher.js

### Functions:

    encrypt(plain, primer): cipher
    CT(i) = (PT(i) + key(i)) mod 26

    decrypt(cipher, primer): plain
    PT(i) = (CT(i) - key(i)) mod 26

### Requirements:

    key - Key is any alphabetic character.
    Encryption - New Key is generated by primer at its initial and merging the plain text stream. 
    Decryption - New Key is generated by primer at its initial and from tabula rectat stream continues. 


### Key Domain : Depends upon primer size n ^ size of primer

    Since only initial primer is to guessed.

---
_Source: https://npm.io/package/encrypt-me · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._