[mercury-users] functions returning in values?

[Tomas By]

MCL writes:
> >> An interesting application of this stuff is in cryptography: you only
> >> have to describe the cipher function in Mercury and supply the
> >> appropriate modes and Mercury will give you both enciphering and
> >> deciphering, halving the likelihood of you introducing errors in your
> >> code.
> 
>     I have to doubt it: any decent cryptography scheme should not be
> reversible that easy---unless you want to enumerate all possible clear
> messages.

so how do you decrypt messages in your decent scheme?

(youre thinking of one-way hash functions, while ralph was talking
about ciphers, I believe)

/Tomas
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