[Resource Topic] 2000/039: Encryption Modes with Almost Free Message Integrity

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Encryption Modes with Almost Free Message Integrity

Authors: Charanjit S. Jutla


We define a new mode of operation for block ciphers which in addition to providing confidentiality also ensures message integrity. In contrast, previously for message integrity a separate pass was required to compute a cryptographic message authentication code (MAC). The new mode of operation, called Integrity Aware Parallelizable Mode (IAPM),
requires a total of m+1 block cipher evaluations on a plain-text of length m blocks. For comparison, the well known CBC (cipher block chaining) encryption mode requires m block cipher evaluations, and the second pass of computing the CBC-MAC essentially requires additional m+1 block cipher evaluations. As the name suggests, the new mode is also highly parallelizable.

ePrint: https://eprint.iacr.org/2000/039

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