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F4-Style F5 — Next Attempt
Since the F4-style F5 I mentioned a while ago wasn’t really that “F4-style” I’ve pushed my next attempt into the public “algebraic attack” bitbucket repository. This version swaps the two outer loops, i.e. it proceeds by degree in the outer loop instead of the index of the polynomials. Of course, we are talking about a toy implementation here to understand the algorithm and not an attempt to implement F5 efficiently.
SSH Paper Available Online
Our paper on plaintext recovery attacks against SSH is now available online both locally and on Kenny’s website. Btw. contrary to popular belief the paper is not on an implementation error in OpenSSH but on a design flaw in the SSHv2 specification which enables a variety of attacks against various implementations of the standard.
