[Cryptography] block size / block cipher versus stream cipher

[jrzx]

I wrote:

> On my desktop, it costs a couple of microseconds to generate a fresh shared
> symmetric secret from a an unshared ristretto25519 scalar and a shared
> ristretto25519 elliptic point.

Oops, that should have read "a couple of milliseconds".

It is the hashes that take a couple of microseconds.
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