Encoding and Decoding with Clojure

Projects that use a range of ciphers, from simple to more complex, to encode and decode text.

A common approach to encoding and decoding text is to use a dictionary lookup, defined in Clojure as a hash-map. Each key-value pair provides a mapping for encoding and decoding. Looking up a a character as a key in the map provides a value that is the encrypted character.

These projects show several ways to transform data in Clojure.

Project	Topics	Description
Boolean names to 0 or 1	hash-map get	Convert boolean values to classic 1 or 0 values
Caesar cipher - ROT13	seq cycle zipmap	A simple alphabet rotation cipher
RNA / DNA converter		Convert between DNA and RNA
Clacks telegram		Encoding and decoding messages with Clacks

Examples of Encoding

• Portable Network Graphics for image compression
• Vorbis for music and video compression plus several commercial compression encoders
• Enigma machine - encrypted communications