Cryptanalysis of the DIZY Stream Cipher With Provable Security
Summary
Researchers found security weaknesses in DIZY, an ultra-lightweight stream cipher (an encryption method designed for devices with limited computing power) designed to protect resource-constrained devices like RFID tags. The attacks show that DIZY-80 and DIZY-128 provide weaker security (65/86-bit levels) than claimed (80/112-bit levels) by exploiting how the cipher initializes. The researchers proposed an improved version called DIZYa that resists these attacks while maintaining the original design's advantages.
Solution / Mitigation
An improved variant of DIZY, called DIZYa, is proposed. The analysis on DIZYa shows that the improved variant can provide better security resistance against all known attacks including the attacks on DIZY, while maintaining the commendable characteristics of DIZY.
Classification
Original source: http://ieeexplore.ieee.org/document/11534496
First tracked: June 8, 2026 at 02:01 AM
Classified by LLM (prompt v3) · confidence: 95%