[messaging] Sphinx symmetric crypto questions

Natanael 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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