סמינר: Graduate Seminar
R-OCB: Reliable Offset Codebook
| In this research, we study a block-cipher mode of operation for joint encryption and error correction over noisy communication channels. Motivated by the cryptosystem-as-error-correction paradigm, structured redundancy is introduced before encryption and later exploited by the receiver during decoding.
We propose Reliable Offset Codebook (R-OCB), a redundancy-based adaptation of the Offset Codebook (OCB) mode for multi-block messages. Each information block is extended with structured redundancy before encryption. At the receiver, this redundancy is used as a validity condition while candidate channel-noise patterns are tested, allowing error correction to be incorporated into the decryption process. R-OCB is evaluated over binary symmetric channels (BSC) and additive white Gaussian noise (AWGN) channels using bit-error rate (BER) and block-error rate (BLER). For a block length of 128 bits and tested payload lengths of 112, 116, and 120 bits, the simulation results show performance comparable to the evaluated coding baselines. Overall, the results demonstrate that redundancy embedded within a block-cipher mode can support reliable communication over noisy channels and provide a framework for potentially combining encryption and error correction within a unified construction. M.Sc. student under the supervision of Prof. Alejandro Cohen.
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