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Cryptanalysis of the DIZY Stream Cipher With Provable Security
- Published
- Record updated
Summary
Researchers present key recovery attacks on DIZY-80 and DIZY-128, a small-state stream cipher from 2023. The attacks exploit reaching a weak state mid-initialization via chosen IVs and use Hellman tables. They show DIZY-80 and DIZY-128 offer only 65 and 86-bit security, versus the 80 and 112-bit claimed by the designers. The paper also proposes DIZYa, an improved variant.
Mitigation
The source proposes an improved variant, DIZYa, which it says provides better resistance to all known attacks, including those on DIZY, while keeping DIZY's characteristics. The source does not describe a patch or configuration change for existing DIZY deployments.