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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?

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

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  • $\begingroup$ That seekable stream cipher described in that page is very interesting, I bookmarked because I'm going to try to implement in the future. $\endgroup$ Nov 25, 2022 at 19:42

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