[11201] in cryptography@c2.net mail archive
Re: building a true RNG (was: Quantum Computing ...)
daemon@ATHENA.MIT.EDU (David Wagner)
Wed Jul 24 11:32:05 2002
X-Envelope-To: cryptography@wasabisystems.com
To: cryptography@wasabisystems.com
From: daw@mozart.cs.berkeley.edu (David Wagner)
Date: 23 Jul 2002 19:21:28 GMT
X-Complaints-To: news@abraham.cs.berkeley.edu
Eugen Leitl wrote:
>Is there any point in compressing the video before running it through a
>cryptohash?
No. (assuming you're talking about lossless compression)
In general, any invertible transformation neither adds or subtracts
entropy, and hence is extremely unlikely to make any difference to the
performance of the hash function (assuming SHA-1 is cryptographically
secure, which it is currently believed to be). Lossless compression
is just one special kind of invertible transformation.
---------------------------------------------------------------------
The Cryptography Mailing List
Unsubscribe by sending "unsubscribe cryptography" to majordomo@wasabisystems.com
