Re: Russia Intercepts US Military Communications?

2003-03-31 Thread Dave Howe
reusch wrote:
 Via the Cryptome, http://www.cryptome.org/, RU sure, look
 at http://www.aeronautics.ru/news/news002/news082.htm.
 I'm amazed at their claims of radio interception. One would
 expect that all US military communications, even trivial ones,
 are strongly encrypted, given the ease of doing this. Someone,
 more well informed, please reassure me that this is the case.
Possibly someone was bribable - presumably the CoW need to share the same
frequencies and keys, so


-
The Cryptography Mailing List
Unsubscribe by sending unsubscribe cryptography to [EMAIL PROTECTED]


Re: AES-128 keys unique for fixed plaintext/ciphertext pair?

2003-02-24 Thread Dave Howe
Hmm. another simpler theory to remove Shannon from the discussion.

assume that the original assertion is correct - that for each plaintext p
and each cyphertext c there exists only one key k that is valid to map
encrypt(p,k)=c. In this case, for each possible cyphertext c, *every*
possible plaintext p is a valid translation given a unique key k. for that
reason, the uniary distance for encrypt() must be larger than one block - as
it is self evidently not possible to map *any* c to a unique p without
knowledge of the key.
For that reason, Shannon cannot be applied to a single block of encrypt(),
and can be safely ignored :)


-
The Cryptography Mailing List
Unsubscribe by sending unsubscribe cryptography to [EMAIL PROTECTED]