[messaging] Sphinx symmetric crypto questions
natanael.l at gmail.com
Thu Nov 19 13:27:46 PST 2015
Den 19 nov 2015 21:37 skrev "Jeff Burdges" <burdges at gnunet.org>:
> There is however another approach that appears to work :
> Invent a one-sided large block cypher by block chaining regular block
> cyphers of the size of one hop's information. We want the property
> that alterations to cypertext create uncontrolled changes to all
> plaintext before the alteration, or after if we reverse the orientation
> of the Sphinx header. If an attacker modifies the header, then any
> address containing or before the modified bit decrypts as scrabbled.
No need to reinvent all-or-nothing transforms, they're already here.
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