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In CRYPTO 2017, Mennink and Neves showed almost n-bit security for a dual version of EWCDM. In this paper we describe a birthday attack on this construction which violates their claim.
EWCDM: An Efficient, Beyond-Birthday Secure, Nonce-Misuse Resistant MAC
Wegman-Carter MAC Davies-Meyer construction nonce-misuse resistance
2016/5/30
We propose a nonce-based MAC construction called EWCDM (Encrypted Wegman-Carter with Davies-Meyer), based on an almost xor-universal hash function and a block cipher, with the following properties: (i...