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2018/1127 (PDF) Last updated: 2018-11-29
Freestyle, a randomized version of ChaCha for resisting offline brute-force and dictionary attacks
P. Arun Babu, Jithin Jose Thomas
Secret-key cryptography

This paper introduces Freestyle, a randomized, and variable round version of the ChaCha cipher. Freestyle demonstrates the concept of hash based halting condition, where a decryption attempt with an incorrect key is likely to take longer time to halt. This makes it resistant to key-guessing attacks i.e. brute-force and dictionary based attacks. Freestyle uses a novel approach for ciphertext randomization by using random number of rounds for each block of message, where the exact number of...

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