Security Analysis of WG-7 Lightweight Stream Cipher against Cube Attack. (arXiv:2306.04352v1 [cs.CR])

Welch--Gong (WG) is a hardware-oriented LFSR-based stream cipher. WG-7 is a
version of the eStream submission Welch--Gong, used for RFID encryption and
authentication purposes. It offers 80-bit cryptographic security. In modern
days, almost all ciphers achieve the security by exploiting the nonlinear
feedback structure. In this paper, we investigate the security of the nonlinear
feedback-based initialization phase of the WG-7 stream cipher using the
conventional bit-based division property of cube attack, by considering the
cipher in a non-blackbox polynomial setting. …

analysis attack authentication cipher ciphers cryptographic security cube encryption exploiting feedback hardware rfid security security analysis stream stream cipher version