Higher order eTCR hash functions.

Abstract: We study higher order eTCR (enhanced target collision resistance) hash functions, where th-order eTCR is denoted by eTCR . We prove that a few rounds of the MD (Merkle–Damgård) scheme and a few levels of the TR (tree) scheme can be eTCR under the compression function is eTCR for some positive integer . Additionally, we prove that the TH (tree hash) scheme also preserves eTCR. [Copyright &y& Elsevier]