[E-Lang] New Page: Partially Ordered Message Delivery

Ben Laurie ben@algroup.co.uk
Mon, 05 Mar 2001 18:44:02 +0000


"Mark S. Miller" wrote:
> 
> At 09:10 AM Monday 3/5/01, Ben Laurie wrote:
> >Tyler Close wrote:
> >> I think E's archash technique is actually more flexible than this. In
> >> an E message send, the sender gets to specify the address that the
> >> return value will be placed at. The sender does this by providing a
> >> nonce (the archash) that will be transformed by the receiver with a
> >> one-way-hash (SHA1), to calculate the return value address.
> >
> >Hmm! How is this calculation done?
> 
> The archash is a randomly chosen unguessable number.  Or actually,
> pseudo-randomly chosen from an entropy pool into which we're constantly
> tossing new alleged entropy whenever we find some (Entropy mechanism thanks
> to Bill).  The "address" (as in SwissNumber) is simply the SHA1 hash of this
> unguessable number.
> 
> I called it "archash" as an abuse of trig terminology.
> 
>     X == archash(address)  iff  hash(X) == address

Ah, OK. And what's the point of using the hash instead of the address?

Cheers,

Ben.

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