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A Single-Key Domain Extender for Privacy-Preserving MACs and PRFs

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Information Security and Cryptology – ICISC 2008 (ICISC 2008)

Part of the book series: Lecture Notes in Computer Science ((LNSC,volume 5461))

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Abstract

We present a CBC (cipher block chaining)-like mode of operation for MACs (message authentication codes) using a hash function. The new construction iCBC (imbalanced CBC) does not follow the Merkle-Damgård design but rather iterates the underlying compression function directly in a CBC-like manner. Many of the prior MAC constructions, including HMAC, assume PRF (pseudo-random function) properties of the underlying primitive. In contrast, our iCBC-MAC makes only a PP-MAC (privacy-preserving MAC) assumption about the compression function. Despite the fact that PP-MAC is a strictly weaker requirement than PRF, iCBC-MAC works with a single key like HMAC and runs as efficiently as HMAC. Moreover, iCBC-MAC becomes even faster than HMAC, depending on the choice of security parameters. Additionally, iCBC-MAC is multi-property-preserving in the sense that it operates as a domain extender for both PP-MACs and PRFs.

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Yasuda, K. (2009). A Single-Key Domain Extender for Privacy-Preserving MACs and PRFs. In: Lee, P.J., Cheon, J.H. (eds) Information Security and Cryptology – ICISC 2008. ICISC 2008. Lecture Notes in Computer Science, vol 5461. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-00730-9_17

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  • DOI: https://doi.org/10.1007/978-3-642-00730-9_17

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-00729-3

  • Online ISBN: 978-3-642-00730-9

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