uglycry
A small dependencyless library that provides only a special class for encrypting and decrypting arbitrary files using PNG images as cryptographic keys in place of typical password strings. It provides both AES-GCM and Vigenère encryption/decription method
vigenere
npm package for basic encoding and decoding
cipherjs
Javascript implementation of simple ciphers
text-ciphers
Monoalphabetic substitution and Vigenere ciphers