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This paper demonstrates analysis of well known block cipher CAST-128 and its modified version using avalanche criterion and other tests namely encryption quality, correlation coefficient, histogram analysis and key sensitivity tests.CAST-128 is a design procedure for symmetric encryption algorithm developed by Carlisle Adams and Stafford Tavares. CAST has a classical Feistel network consisting of 16 rounds and operating on 64-bit blocks of plaintext to produce 64-bit blocks of cipher text. The key size varies from 40 bits to 128 bits in 8-bit increments.
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