Can you keep a secret? This encrypted drive can...

[Jon Callas]

I just ran a speed test on my laptop. Here are some relevant excerpts:

Cipher    Key Size  Block Size  Enc KB/sec  Dec KB/sec
--------  --------  ----------  ----------  ----------
IDEA      128 bits   8 bytes      24032.09    24030.66
3DES      192 bits   8 bytes      10387.67    10399.30
CAST5     128 bits   8 bytes      29331.17    29459.49
Twofish   256 bits  16 bytes      20233.63    19185.82
AES-128   128 bits  16 bytes      44100.23    46266.98
AES-192   192 bits  16 bytes      39731.33    41228.87
AES-256   256 bits  16 bytes      36017.95    37302.43
Blowfish  128 bits   8 bytes      35347.34    38311.22

Comparing AES-128 and AES-256, encrypt speed is 1.2243959x and  
decrypt is 1.2403208x. So that makes my lick-your-finger-and-stick-it- 
in-the-wind rule of thumb of 20% slower okay. I'll try to say 20-25%  
in the future.

Of course, though, implementation matters a lot. I'm running a PPC-32  
machine. You'll get different answers on an ia32, and different ones  
an AMD64.

	Jon

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