i want to know how many RSA 1024 bit long key decryption can a regular pentium4 computer do per second ? how to calculate RSA performance and determine its remaining time ?
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$\begingroup$ Note that RSA 1024 is getting pretty weak (see keylength.com. I would not protect too much important data with it, please try and upgrade to higher keysizes or ECIES if you want faster asymmetric performance during decryption. $\endgroup$– Maarten Bodewes ♦Aug 25, 2012 at 23:09
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Good link: Crypto++ for pentium 4
Milliseconds/Operation Megacycles/Operation
RSA 1024 Encryptio 0.09 0.27
RSA 1024 Decryption 2.28 6.68
CPU frequency of the test platform is 2.93e+009 Hz.
I think the performance depends on the language, library and CPU architecture.
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$\begingroup$ so 0.002 second take an RSA 1024 decryption with pentium 4 right pooya ? $\endgroup$– marioAug 21, 2012 at 20:15
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2$\begingroup$ @mario: Yes. Order of magnitude for RSA-1024 private-key operations (either decryption, or signature generation) on a Pentium 4 is 1000/second. This will vary tremendously depending on implementation (some are 10 times slower, or 100..), use of CRT (not using CRT slows down by a factor over 3), and use of countermeasures against timing attacks and other side channels. Public-key operations (encryption or signature verification) may be like 50 times faster. $\endgroup$– fgrieu ♦Aug 21, 2012 at 21:32
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$\begingroup$ @mario:If you are using Crypto++ library, yes. $\endgroup$ Aug 22, 2012 at 1:08