> this kind of bare statement benefits greatly from a citation Seriously? > I don't think GP is suggesting including results of hashes in the contents to be h

> this kind of bare statement benefits greatly from a citation Seriously? > I don't think GP is suggesting including results of hashes in the contents to be hashed by subsequent hash functions, but rather calculating MD5(contents), SHA1(contents), SHA2(contents), FOO4(contents) etc, and then concatenating all the hashes together. Or am I misunderstanding and this kind of scheme is exactly the "cascading" that you're talking about ? Yes, this is cascading. See this paper: https://www.iacr.org/archive/crypto2004/31520306/multicollisions.pdf https://www.iacr.org/archive/crypto2004/31520306/multicollis...