Re: [IPsec] mot sure if this posted before, so resending

2015-04-07 Thread Yoav Nir
On Apr 6, 2015, at 10:07 PM, Stephen Kent k...@bbn.com wrote: Yoav, Hi, There is two questions I would like guidance from the group about. First is the nonce/IV question: In the current draft, there is a 64-bit IV with guidance not to repeat them (so use a counter or LFSR). The

Re: [IPsec] mot sure if this posted before, so resending

2015-04-07 Thread Stephen Kent
Yoav, I think it’s risky to base decisions on our attempts to divine future NIST decisions, but I agree that out best option now is to leave the 64-bit IV (or nonce) explicit for now and perhaps later add an IKE extension that allows you to “compress” the IV as long as it’s equal to the

[IPsec] mot sure if this posted before, so resending

2015-04-06 Thread Stephen Kent
Yoav, Hi, There is two questions I would like guidance from the group about. First is the nonce/IV question: In the current draft, there is a 64-bit IV with guidance not to repeat them (so use a counter or LFSR). The function itself accepts a 96-bit input nonce, so the nonce is constructed