Tool for encryption/decryption in BasE91, an encoding based on 91 ASCII characters that limits the size of the encoded data.
Base91 Encoding - dCode
Tag(s) : Character Encoding
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Encryption uses a method similar to base64 but with an expanded alphabet to 91 characters: the 94 printable ASCII characters (from 0x21 to 0x7E) omitting -: dash (0x2D), \: backslash (0x5C) and ': apostrophe (0x27).
To simplify, the data is divided into 13-bit binary packets (ie 2 ^ 13 = 8192 values) which are then encoded in 2 letters of the alphabet (which contains 91 characters and 91 ^ 2 = 8281).
Example: DCODE is coded xJ,Jc,A in BasE91
Joachim Henke claim it was invented in 2005, see here (link)