#8246: Carmichael lambda function for the Blum-Blum-Shub pseudorandom bit
generator
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Reporter: mvngu | Owner: mvngu
Type: enhancement | Status: closed
Priority: major | Milestone: sage-4.3.3
Component: cryptography | Resolution: fixed
Keywords: | Author: Mike Hogan, David Joyner, Minh
Van Nguyen
Upstream: N/A | Reviewer: David Joyner
Merged: sage-4.3.3.alpha1 | Work_issues:
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Comment(by ylchapuy):
Replying to [comment:7 wdj]:
> For me, a small speed up does not matter. The function is used
theoretically in security estimates for the BBS stream cipher.
I totally agree on this, but you asked for speed results! I didn't
mentionned speed at all in my first message.
> I'm not saying that you should not try to speed things up,
It's definitely not what I'm trying to do.
> it is just that it is more important for the function to exist in Sage
that for it to be fast. But if someone wants me to referee a new patch,
that is fine too.
My point was:
* there is a bug: e.g. carmichael_lambda(16) is of type
sage.rings.rational.Rational ;
* a small speed up does not matter: therefore no need to hard code the
first 10 cases, it just makes the code less readable ;
* my code is IMHO just easier to read.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8246#comment:8>
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