Encryption with Python

Paul Rubin http
Wed Jun 23 07:48:46 CEST 2004


Peter Hansen <peter at engcorp.com> writes:
> Besides, what you say is not possible.  On my machine,
> which is about a P4 2500MHz, scanning an array.array('c') with
> 22MB of data in it, doing nothing but reading each byte and
> ignoring it, takes about 8 seconds.  So does converting the
> array to a list, which is pretty much all C code.  Strings
> are immutable, so you can't be working with one of them...

Well, you could do 32-bit operations which are maybe 4x faster.  
You could maybe get even more speedup using built-in C functions.
For example, you could do rot13 encryption with the string.translate
method which should be quite fast.  FWIW,

    http://www.nightsong.com/phr/crypto/p3.py 

should be quite secure, and should run at least 1 mbyte/sec on your
p4/2500, maybe quite a bit more.



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