Joint security and channel coding for OFDM communications

In this paper we propose an algorithm for joint authentication, integrity verification and channel coding, optimized for OFDM based communication systems. Joint security and channel coding is performed by means of a Shannon's substitution-permutation scheme and a pseudo-random punctured Turbo Code, whose actual parameters are set in accordance to a private session key. User authenticity and message integrity are verified comparing the log-likelihood of the decoded ciphertext with a threshold, adapted to actual channel condition.