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Base91 Cipher

Tool for encryption/decryption in Base91. BasE91 is an encoding method that uses ASCII characters. Similar to base64, it has the advantage of limiting the size of the encoded data.

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Base91 Cipher -

Tag(s) : Cryptography, Substitution Cipher

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# Base91 Cipher

## Base 91 Encoder

Tool for encryption/decryption in Base91. BasE91 is an encoding method that uses ASCII characters. Similar to base64, it has the advantage of limiting the size of the encoded data.

### How to encrypt using Base91 cipher?

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 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

### How to decrypt Base91 cipher?

The decryption performs the inverse conversion to base 91.

To simplify, the message is split into groups of 2 letters which are converted into 13-bit data.

Example: The message encoded in Base 91 xJ,Jc,A is decoded in DCODE.

### How to recognize BasE91 ciphertext?

The message is composed only of printable ASCII characters (except dash, backslash and apostrophe) that is 91 characters maximum.

### When Base91 have been invented ?

Joachim Henke claim it was invented in 2005, see http://base91.sourceforge.net/