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I have been trying to figure this out. I have found conflicting results. In some cases they say CFB is faster and in other resources I have found that OFB can save speed using a few techniques. Which would be faster? Any way to figure this out?
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http://en.wikipedia.org/wiki/Cipher_mod … _.28CFB.29
http://en.wikipedia.org/wiki/Cipher_mod … _.28OFB.29
Presumably, they are both _really close_ to the same speed, and would be limited by the block cipher itself (I see this said often, but sometimes see it said that OFB is faster. So not entirely sure.)
I generally use CTR for my ssh connections, as it is parallelizable.
host *
ciphers aes128-ctr,aes192-ctr,aes256-ctr
I prefer aes-128 based on this: http://www.schneier.com/blog/archives/2 … w_aes.html
might also be helpful: http://stackoverflow.com/questions/1220 … tr-ocb-cfb
Last edited by cactus (2010-12-11 00:11:40)
"Be conservative in what you send; be liberal in what you accept." -- Postel's Law
"tacos" -- Cactus' Law
"t̥͍͎̪̪͗a̴̻̩͈͚ͨc̠o̩̙͈ͫͅs͙͎̙͊ ͔͇̫̜t͎̳̀a̜̞̗ͩc̗͍͚o̲̯̿s̖̣̤̙͌ ̖̜̈ț̰̫͓ạ̪͖̳c̲͎͕̰̯̃̈o͉ͅs̪ͪ ̜̻̖̜͕" -- -̖͚̫̙̓-̺̠͇ͤ̃ ̜̪̜ͯZ͔̗̭̞ͪA̝͈̙͖̩L͉̠̺͓G̙̞̦͖O̳̗͍
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Also this is a _great_ presentation.
http://www.bsdcan.org/2010/schedule/events/183.en.html
"Be conservative in what you send; be liberal in what you accept." -- Postel's Law
"tacos" -- Cactus' Law
"t̥͍͎̪̪͗a̴̻̩͈͚ͨc̠o̩̙͈ͫͅs͙͎̙͊ ͔͇̫̜t͎̳̀a̜̞̗ͩc̗͍͚o̲̯̿s̖̣̤̙͌ ̖̜̈ț̰̫͓ạ̪͖̳c̲͎͕̰̯̃̈o͉ͅs̪ͪ ̜̻̖̜͕" -- -̖͚̫̙̓-̺̠͇ͤ̃ ̜̪̜ͯZ͔̗̭̞ͪA̝͈̙͖̩L͉̠̺͓G̙̞̦͖O̳̗͍
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Thanks, it seems really hard to figure out which is faster. I see conflicting statements quite often. I am enjoying the links though, lots of nice information.
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