Re: [tor-dev] Even more notes on relay-crypto constructions

2012-10-09 Thread Robert Ransom
On 10/9/12, Nick Mathewson wrote: > On Tue, Oct 9, 2012 at 12:31 PM, Robert Ransom > wrote: > [...] >>> AES-CTR + HMAC-SHA512/256. >>> >>> AES-CTR + Poly1305. Poly1305 requires nonces, but we can use a >>> counter for those. >> >> Poly1305AES requires nonces. Poly1305 itself requires >>

Re: [tor-dev] Even more notes on relay-crypto constructions

2012-10-09 Thread Nick Mathewson
On Tue, Oct 9, 2012 at 12:31 PM, Robert Ransom wrote: [...] >> AES-CTR + HMAC-SHA512/256. >> >> AES-CTR + Poly1305. Poly1305 requires nonces, but we can use a >> counter for those. > > Poly1305AES requires nonces. Poly1305 itself requires > (computationally-indistinguishable-from-) indepe

Re: [tor-dev] Even more notes on relay-crypto constructions

2012-10-09 Thread Robert Ransom
On 10/9/12, Robert Ransom wrote: > On 10/8/12, Nick Mathewson wrote: >> The second category (frob, encrypt, frob) is pretty elegant IMO. The >> best-explained of these I've seen so far are in a >> paper by Palash Sarkar [Efficient-Tweakable], though the earlier TET >> construction [TET] might al

Re: [tor-dev] Even more notes on relay-crypto constructions

2012-10-09 Thread Robert Ransom
On 10/8/12, Nick Mathewson wrote: > I should share with the list an update of where I am with a design for > an improved relay crypto protocol. For background and motivation, > please see the last thread on the topic [Prop202]. > > There are three main questions remaining for me in choosing among