Statistical Characterization of Decryption Errors in Block-Ciphered Systems


It's well-known that avalanche impact errors in received noisy ciphertexts can cause severe error propagation in block-ciphered encryption systems, therefore resulting during a large reduction in the achievable throughput. However, very little is known concerning the statistical properties of the underlying error sequences in decrypted plaintexts in block-ciphered systems when channel errors are present. A rigorous study of the statistical properties of the errors in block-ciphered crypto-systems operating in cipher block chaining (CBC) mode is provided. The equivalent channel transition chance is obtained and then used to derive error statistics as well as each error weight possibilities and gap distributions. The validity of the theoretical analyses is confirmed by the excellent match with results obtained by simulated information encryption customary (DES)-primarily based and advanced encryption customary (AES)-primarily based crypto-systems operating in CBC mode. The error statistics will be valuable in the design and performance evaluation of communication protocols, plus in error-management schemes for block-ciphered crypto-systems within the presence of erroneous ciphertexts, where errors are intentionally left to reinforce security against passive eavesdroppers.

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