> The case I was making, is that weakhash(stronghash(m)) has the security of weakhash, no matter how strong stronghash is.
I'll have to disagree. There are no known collision attacks against SHA-1(SHA-3(M)), so in the applied case, a combination can be more secure for some properties, even if it isn't in the theoretical case.
I'll have to disagree. There are no known collision attacks against SHA-1(SHA-3(M)), so in the applied case, a combination can be more secure for some properties, even if it isn't in the theoretical case.