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- Path: sparky!uunet!spool.mu.edu!olivea!apple!uuwest!sspy
- From: sspy@west.darkside.com (mshannon)
- Newsgroups: sci.crypt
- Subject: Help
- Message-ID: <a3JHwB1w165w@west.darkside.com>
- Date: 28 Dec 92 09:26:09 GMT
- Organization: The Dark Side of the Moon +1 408 245 SPAM
- Lines: 28
-
- Hmmm. Not having much experience on the Internet, I tend to be easily
- confused. Now I heard that .sci meant science, and .crypt meant
- cryptography, so naturally I assumed...
- Actually, this newsgroup is apparently for legal and political
- discussions about cryptography, and not the science of...
- As I can't find the proper place, I will pose a few questions here in the
- chance that they might elicit some needed answers.
- This is for publication in Digital Privacy, to be released in January.
- LOOMING deadline.
- If I may quote you, please advise, otherwise I will assume that I may
- not.
- 1. Is there any real, actual, documented, case of the DES having been
- cracked through brute force alone, in ECB or CBC mode?
- 2. Is there any hard evidence that this has not happened and isn't likely
- to happen within n years?
- 3. Can anyone state the amount of time a given computer would need to try
- out all of the DES key combinations? For example, the Cray Y-MP C-90
- which is supposedly the fastest computer on Earth.
- 4. Does anyone know why the DES key was REALLY changed to 56 bits?
- 5. Does double encryption, meaning enc with key A, dec with key B then
- enc again with key A, actually increase the resistance to attack? Can
- anyone put numbers on this?
- 6. Is it possible to state for a known fact that there are no weaknesses
- or trap doors, or any other ways of comprimising the DES and that no
- matter how carefully the DES was designed 15 years ago, today's
- technology would without question, reveal any such weakness?
- Thanks in advance for any replies.
- M. Shannon PO Box 192171 San Francisco 94119 FAX 408-732-7980.
-