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 idea of exploiting the structure of a cryptosystem for error correction 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 conventional error-correcting-code 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 Assistant Prof. Alejandro Cohen and Assistant Prof. Rafael G. L. D’Oliveira.
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