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3 votes

Does a hierarchical key derivation exist? where child keys can decrypt values encrypted by descendants but not vice versa?

an efficient solution is to use Hierchical Identity-Based Encryption, in the line of [BBG05] https://eprint.iacr.org/2005/015.pdf.
PPL's user avatar
  • 31
2 votes
Accepted

Why does Argon2 truncate BLAKE2b outputs?

Emailing all three authors resulted in no reply, but I realised this is done to prevent you computing subsequent blocks from previous blocks. Given the first block of output, you don't want someone to ...
samuel-lucas6's user avatar

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