Re: [cryptography] 100 Gbps line rate encryption
I think Bernstein's Salsa20 is faster and significantly more secure than RC4, whether you'll be able to design hardware to run at line-speed is somewhat more questionable though (would be interested to know if it's possible right enough). On 22 June 2013 18:35, William Allen Simpson william.allen.simp...@gmail.com wrote: A quick question: what are our current options for 100 Gbps line rate encryption? Are we still using variants of ARC4? ___ cryptography mailing list cryptography@randombit.net http://lists.randombit.net/mailman/listinfo/cryptography ___ cryptography mailing list cryptography@randombit.net http://lists.randombit.net/mailman/listinfo/cryptography
Re: [cryptography] 100 Gbps line rate encryption
On 2013-06-23 6:47 AM, Peter Maxwell wrote: I think Bernstein's Salsa20 is faster and significantly more secure than RC4, whether you'll be able to design hardware to run at line-speed is somewhat more questionable though (would be interested to know if it's possible right enough). I would be surprised if it is faster. ___ cryptography mailing list cryptography@randombit.net http://lists.randombit.net/mailman/listinfo/cryptography
Re: [cryptography] 100 Gbps line rate encryption
Would anybody dare to use a SHA256 based stream cipher? (XOR with checksum of key and counter or whatever you want to throw in there.) Would it be faster than RC4/Salsa20? I'm a bit curious about why nobody seems to be using hash/checksum based stream ciphers. 2013/6/23 James A. Donald jam...@echeque.com On 2013-06-23 6:47 AM, Peter Maxwell wrote: I think Bernstein's Salsa20 is faster and significantly more secure than RC4, whether you'll be able to design hardware to run at line-speed is somewhat more questionable though (would be interested to know if it's possible right enough). I would be surprised if it is faster. ___ cryptography mailing list cryptography@randombit.net http://lists.randombit.net/mailman/listinfo/cryptography ___ cryptography mailing list cryptography@randombit.net http://lists.randombit.net/mailman/listinfo/cryptography
Re: [cryptography] 100 Gbps line rate encryption
On 22 June 2013 23:31, James A. Donald jam...@echeque.com wrote: On 2013-06-23 6:47 AM, Peter Maxwell wrote: I think Bernstein's Salsa20 is faster and significantly more secure than RC4, whether you'll be able to design hardware to run at line-speed is somewhat more questionable though (would be interested to know if it's possible right enough). I would be surprised if it is faster. Given the 100Gbps spec, I can only presume it's hardware that's being talked about, which is well outwith my knowledge. We also don't know whether there is to be only one keystream allowed or not. However, just to give an idea of performance: from a cursory search on Google, once can seemingly find Salsa20/12 being implemented recently on GPU with performance around 43Gbps without memory transfer (2.7Gbps with) - http://link.springer.com/chapter/10.1007%2F978-3-642-38553-7_11 ) - unfortunately I don't have access to the paper. On a decent 64-bit processor, the full Salsa20/20 is coming in around 3-4cpb - http://bench.cr.yp.to/results-stream.html - and while cpb isn't a great measurement, it at least gives a feel for things. Going on a very naive approach, I would imagine the standard RC4 will suffer due to being byte-orientated and not particularly open to parallelism. Salsa20 operates on 32-bit words and from a cursory inspection of the spec seems to offer at least some options to do operations in parallel. If I were putting money on it, I suspect one could optimise at least Salsa20/12 to be faster than RC4 on modern platforms; whether this has been done is another story. Fairly sure Salsa20/8 was faster than RC4 out-of-the-box. As with anything though, I stand to be corrected. ___ cryptography mailing list cryptography@randombit.net http://lists.randombit.net/mailman/listinfo/cryptography
Re: [cryptography] 100 Gbps line rate encryption
On Jun 22, 2013, at 15:31 , James A. Donald jam...@echeque.com wrote: On 2013-06-23 6:47 AM, Peter Maxwell wrote: I think Bernstein's Salsa20 is faster and significantly more secure than RC4, whether you'll be able to design hardware to run at line-speed is somewhat more questionable though (would be interested to know if it's possible right enough). I would be surprised if it is faster. Be surprised, then... almost all of the recent word- or block- oriented stream ciphers are faster than RC4. And NOTHING should still be using RC4; by today's standards it is quite insecure. Greg. ___ cryptography mailing list cryptography@randombit.net http://lists.randombit.net/mailman/listinfo/cryptography
