On Monday, September 6, 2004, at 11:43 PM, MisterX wrote:
the 32 bit word is just a long word... bitXOR is used as a small time encryption. Just bitxor any number, you will get aonther number. If you reverse the operation, you get your number back. The bitXOR function is limited to 2^48-1 or 2^64-1.
Xavier,
From TDocs: the largest long integer allowed by the current operating system. (On most operating systems, this is 2^32, or 4,294,967,296.)
As I recall Transcript bitXOR function is limited to 2^32, even on 64 bit systems.
If you use a non-prime number, it's possible that you get multiple numbers
that can unlock this number. BitXOR is extremely weak since the number
of attacks is quite small. In RSA, they started with (approx.) 2^56 bit
primes, then 2^128, and they way higher now, 2^4096 possibly.
Random padded cypher blocks are just padding to fool the cracker into
thinking he's attacking real data - usually. There's 20 million different
types of pading possible to make their lives an eternity but these guys
can use almost any resources! ;)
Random padded cypher blocks in ECB, perhaps. Random padded cypher blocks in CBC really do change the entire result and not just the random block that is the pad. A 10kbt document encrypted with the same key in CBC that includes a 128 bit random pad comes out different each time it's encrypted. The only way to brute force an attack is to know the key length, the size of the pad, and the encryption algorithm used.
The private key systems use an obscure elliptical geometry topology
which is also used solve the problem or crack the key. The ellipse allows
to have 2 answers for any points on the curve of an ellipse.
Here's more information on how it works. http://www.cs.virginia.edu/cs588/projects/reports/team1.pdf
and a few more links here http://archives.math.utk.edu/topics/numberTheory.html
Note that cryptography is a wide and deep subject, too many links or code to make sense of ;)
Hope that helps. Xavier
Interesting stuff. By attacking the timing and knowing, through testing for the results of different sized keys, one could extrapolate a smarter brute force attack. This is why I like Blowfish. It always uses a 448 bit key. Even when the key is 64 bit it is just repeated until it gets to 448 bits.
Protecting those keys looks like the major part of the issues regarding secrets.
Mark
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