[Cryptography] How should we encrypt external mail attachments

[Peter Gutmann]

Jon Callas <jon at callas.org> writes:

>Both Intel and ARM CPUs have AES and SHA-256 in hardware. (And SHA-1, for
>completeness.)

As a footnote to that before someone starts waving their arms and yelling
about SHA-1, HMAC-SHA1 is still perfectly secure, so all you need is AES +
HMAC-SHAsomething.

Peter.