# Crypto length extension attack

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In that example, you have seen an overwritten attribute. Are you able to say that a good parser must take the last one or the first one? What is the rule? There can be stations that the last one must be taken! That is an attack that can be applied or not. This depends on the station. If you consider that the knowledge of the length extension attack goes back to s , then finding a place applicable to this should amaze someone!.

My question is why would we have to append new key? We don't do it when we are attacking H key message. Why can't we relay on the fact that we will pass verification test we would create correct hash and that if parser tries to extract key from it, that it would take the only key in the block we send out and resume from there.

Why would we have to send 2 keys? Why doesnt attack against H message key work? The attack is a signature forgery. The processing goes like this: The running state is initialized to a fixed, conventional value which is given in the SHA-1 specification. For each input block, the compression function is evaluated, with as input the current running state, and the input block; the output of the function is the new running state. The running state after processing the last block is the hash output.

So now, the length-extension attack. Suppose that you give me a hash value h, computed over a message m that is unknown to me. I know the length of m, but not its contents. Since I know the length of m, I can easily compute the padding p that you used. I will now proceed to computing the SHA-1 hash of m', even though I do not know part of it it begins with m, which I do not know.

When SHA-1 is computed over m', the latter is first padded with p', which depends on the length of m' which I know. The resulting stream is m p z p'. Then, the bit blocks are processed one by one. I cannot do it for the first blocks, since I do not know m. However, I can imagine myself doing it. At some point, I would reach precisely the end of the p string since the length of m p is a multiple of

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