Pompiliu Donescu

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We present the eXtended Ciphertext Block Chaining (XCBC) schemes or modes of encryption that can detect encrypted-message forgeries with high probability even when used with typical noncryptographic Manipulation Detection Code (MDC) functions (e.g., bitwise exclusive-or and cyclic redundancy code (CRC) functions). These modes detect encrypted-message(More)
We show that both variants of the Dual Counter Mode of encryption (DCM) submitted for consideration as an AES mode of operation to NIST by M. Boyle and C. Salter of the NSA are insecure with respect to both secrecy and integrity in the face of chosen-plaintext attacks. We argue that DCM cannot be easily changed to satisfy its stated performance goal and be(More)
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