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Carlisle Adams and Stafford Tavares (CAST)

CAST (Carlisle Adams and Stafford Tavares) is a symmetric block cipher

with a

block length of 64 bits and a variable key length

from 40 bits to 128 bits (CAST-128), selectable in 8-bit increments.In CAST, a block of data is encrypted in 16 rounds. For each round, a key pair is generated which is used for addition, subtraction and XORing. During decryption, the keys

are processed in reverse order. TheCAST algorithm is considered very secure and is described

inRFC

2144.The encryption method was developed in Canada in 1996 by Carlisle Adams and Stafford Tavares and is named after them. In the enhanced version CAST-256, the block length is 128 bits and the key length is 256 bits. The block cipher CAST-256 was one of the Advanced Encryption Standard

(AES) tested encryption methods. CAST works very fast and is not subject to patent protection.

It is described in RFC 2144.

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Englisch: Carlisle Adams and Stafford Tavares - CAST
Updated at: 20.07.2016
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Translations: DE