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Q: Why substantial software systems often take longer to implement than planned and do not perform as well as expected?
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Discuss the reasons why substantial software systems often take longer to implement than planned and do not perform as well as expected?

Read Sean Thorpe's notes!


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Why the DES is slower in software?

I can only guess that you ask about the performance of the DES algorithm when implemented in software as opposed to hardware. Any algorithm that can be economically implemented in hardware will perform faster in hardware than software by orders of magnitude in the general case. Encryption algorithms such as DES are often based on a shift-combine-shift sequence, which is fairly easy to implement in hardware, but can take considerable processing time when implemented in software.