[Cryptography] Compression before encryption?
Tom Mitchell
mitch at niftyegg.com
Fri Jan 9 21:21:35 EST 2015
On Fri, Jan 9, 2015 at 4:22 AM, Stephan Neuhaus <stephan.neuhaus at zhaw.ch>
wrote:
> Dear list,
>
> I have come across the recommendation to "compress before you encrypt", on
> the grounds that this makes plaintext recognition through frequency
> analysis much harder.
This is a tempting practice. Compression after encrypt will see more
apparently random
data and defeat the compression code. Perhaps making the file bigger.
Known header signatures simplify attacks and weaken the result.
--
T o m M i t c h e l l
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.metzdowd.com/pipermail/cryptography/attachments/20150109/ed422f60/attachment.html>
More information about the cryptography
mailing list