[cryptography] DIAC: Directions in Authenticated Ciphers

[Thierry Moreau]

In a long message, Zooko Wilcox-O'Hearn wrote, in part:
> the person who has the authority to sign the message
> can *not* sign new messages
> 
>  it means that the data is immutable once transmitted, even to
> someone who has all of the secrets that the original sender had.

This looks like a notarization use case of crypto, with the attempt to 
implement the notarization service without the help of a trusted 
[timestamp/historic evidence] third party.

Just my attempt to summarize a lengthy explanation ... no further comments.

Regards,

-- 
- Thierry Moreau

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