[Cryptography] Is there a good algorithm providing both compression and encryption at the same time?

[Peter Gutmann]

Christian Huitema <huitema at huitema.net> writes:

>It depends on the application. If it uses fixed length message, e.g., 20
>milliseconds of audio, then using variable length compression is very
>revealing. 

Sure, I'm aware of over two dozen papers on this topic (discussing the ability 
to identify spoken phrases, language used, video content for movie streaming, 
web site browsing patterns, e.g. which tax bracket you're in based on which 
pages on tax sites you visit, and so on), but as I said it depends on whether 
the user considers this a problem or not, and by and large the masses (which 
includes companies, banks, government organisations, and so on, not just Joe 
Sixpack at home) don't.  Skype is in a particularly bad spot here with their 
use of encryption because the vast majority of users don't care whether it's 
encrypted or not (they just want free calling over the Internet), and those 
who really care about encrypted phonecalls typically won't use Skype because 
they let governments listen in.

Peter.