Re: Can Eve repeat?

2003-09-30 Thread Dan Riley
I'm not an expert on this stuff, but I'm interested enough to chase a few references... Ivan Krstic [EMAIL PROTECTED] writes: The idea that observing modifies state is something to be approached with caution. Read-only does make sense in quantum world; implementations of early theoretical

Re: Can Eve repeat?

2003-09-29 Thread Ivan Krstic
On Fri, 26 Sep 2003 09:10:05 -0400, Greg Troxel [EMAIL PROTECTED] wrote: [snip] The current canoncial paper on how to calculate the number of bits that must be hashed away due to detected eavesdropping and the inferred amount of undetected eavesdropping is Defense frontier analysis of quantum

Re: Can Eve repeat?

2003-09-26 Thread Greg Troxel
That's pretty much what I was talking about when I said that it may be possible to clone an arbitrarily large proportion of photons - and that Quantum Cryptography may not actually be secure. A key point is the probability that the measurement/cloning operation has of disturbing the

Re: Can Eve repeat?

2003-09-25 Thread Ivan Krstic
On 24 Sep 2003 08:34:57 -0400, Greg Troxel [EMAIL PROTECTED] wrote: [snip] In Quantum Cryptography, Eve is allowed to not only observe, but also transmit (in the quantum world observing modifies state, so the notion of read only doesn't make sense). Also, Eve is typically accorded unlimited

Re: Can Eve repeat?

2003-09-24 Thread David Honig
At 08:34 AM 9/24/03 -0400, Greg Troxel wrote: A consequence of the infinite CPU assumption is that ciphers like AES, hash functions like SHA-1, etc. are all considered useless by the purist QC community. Thus, people talk about doing authentication with families of universal hash functions. This