Creation of degraded wiretap channel through deliberate noise in block ciphered systems

In this paper we propose an encoding-encryption approach to take advantage of intentional noise introduced in ciphertexts for DES based block ciphers working in CFB mode. Despite Eve's efforts in modifying her linear crytanalysis given the intercepted noisy ciphertexts, there is still a non-negligible probability of having either a crypto-analysis failure… (More)