On: Voyager 1 stops communicating with Earth

[galeaspablo]

No. Hash functions can be used outside of symmetric encryption. Which is the wording I used.

In any case, the overall point remains. Short of the one time pad you can’t build a provably flawless scheme.

[GTP → galeaspablo]

They can be used outside symmetric encryption, e.g. in signature schemes, but the hashing primitives are part of symmetric cryptography.

[galeaspablo → GTP]

Again, I didn’t say symmetric cryptography :)

[GTP → galeaspablo]

You talked about symmetric encryption.