randomly order a list

Geoff Canyon gcanyon at gmail.com
Fri Jun 7 12:13:17 EDT 2013


I did some reading and it sounds like md5 and sha1 should both be
deprecated in favor of sha256.


On Fri, Jun 7, 2013 at 10:57 AM, Dar Scott <dsc at swcp.com> wrote:

> Right.  There is a little bit of overhead for padding for both md5 and
> sha1 (they use the same padding method), as a string a multiple of 64-bytes
> is created.  Then each resulting 64-byte block is processed; this is
> linear.  The methods are very similar, an important difference being the
> number of 32-bit chaining variables; md5 has four and sha1 has five.  (The
> final values are the hash.)  That is a factor in making the sha1 basic
> operation take longer, and thus the whole process take longer.  (We could
> look it up and count all the XOR, SHIFT, OR and AND operations, but you can
> imagine there would be more in scrambling five things instead of
> four--well, scrambled along with a portion of the block.)
>
> I empathize your arrrgh.
>
> Dar
>
>
>
> On Jun 7, 2013, at 9:18 AM, Geoff Canyon wrote:
>
> > On Wed, Jun 5, 2013 at 5:14 PM, Alex Tweedly <alex at tweedly.net> wrote:
> >
> >> Your code has a minor bug :-)
> >>
> >> You "get MD5Digest(S[1]) "
> >> instead of using   S[i]
> >>
> >
> >
> > Arrrrrrrrgh!!! ;-)
> >
> > Interestingly, md5 appears to scale roughly linearly on the length of the
> > strings. 100x as long string means about 15x as long to md5, while 1000x
> as
> > long string means about 120x as long to md5. sha1 is longer but scales
> > similarly.
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