Score:3

Is SHAKE hash function seekable when using it as a stream cipher?

pf flag

I searched a lot for this information in search engines as well as taking a look in the SHAKE reference implementation.

If I decide to use SHAKE as a stream cipher, can I access a specific part of the keystream without having to generate previous data from the beginning?

Score:5
vu flag

No, it's not seekable. However, the Keccak team define other modes of operation for the permutation that may fit your needs.

phantomcraft avatar
pf flag
That seekable stream cipher described in that page is very interesting, I bookmarked because I'm going to try to implement in the future.
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