Pure Python Data Mangling or Encrypting

[Johannes Bauer]

On 27.06.2015 10:38, Steven D'Aprano wrote:

> Can you say "timing attack"?
> 
> http://codahale.com/a-lesson-in-timing-attacks/
> 
> Can you [generic you] believe that attackers can *reliably* attack remote
> systems based on a 20µs timing differences? If you say "No", then you fail
> Security 101 and should step away from the computer until a security expert
> can be called in to review your code.

Yes, as people do more and more proper crypto (in contrast to crappy
stuff like LFSR-based custom keystream generators and such), side
channels become of great importance.

> I'm not a security expert. I'm not even a talented amateur. *Every time* I
> suggest that "X is secure", the security guy at work shoots me down in
> flames. But nicely, because I pay his wages <wink>

:-)

Being shot down in flames is the way to become a security expert,
probably the *only* way. I don't know anyone who is an expert who hasn't
had that horrible experience at least a dozen of times.

It is amazing how many holes you can poke in designs if you look at it
from enough angles. Having holes poked in my designs gives you a
thourough appreciation for the true crypto experts (i.e. people doing
theoretical cryptography).

Best regards,
Johannes

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