[messaging] Sphinx symmetric crypto questions

[Natanael]

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.

https://en.wikipedia.org/wiki/All-or-nothing_transform
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://moderncrypto.org/mail-archive/messaging/attachments/20151119/a21197eb/attachment.html>