- Original Message -
From: Jeremiah Rogers [EMAIL PROTECTED]
To: crypto list [EMAIL PROTECTED]
Sent: Sunday, November 16, 2003 12:50 PM
Subject: Re: A-B-a-b encryption
This is Shamir's Three-Pass Protocol, described in section 22.3 of
Schneier. It requires a commutative cryptosystem.
martin f krafft wrote:
it came up lately in a discussion, and I couldn't put a name to it:
a means to use symmetric crypto without exchanging keys:
- Alice encrypts M with key A and sends it to Bob
- Bob encrypts A(M) with key B and sends it to Alice
- Alice decrypts B(A(M)) with key A,
Dave Howe [EMAIL PROTECTED] writes:
Peter Gutmann wrote:
E4M needs some minor updates for XP by someone who
knows about NT device drivers, otherwise you'll occasionally get
problems unmounting volumes.
Does anyone know of a version where this work has been done?
Since this was last discussed
Enzo Michelangeli wrote:
but the slight risk of collision,
although practically negligible, is a bit irksome
If you quantify the practically negligible risk, it might be less
irksome: SHA-1 is a 160 bit hash. The birthday paradox says that you
would need to hash 2^80 different credit card
David Wagner [EMAIL PROTECTED] wrote in message
news:[EMAIL PROTECTED]
martin f krafft wrote:
it came up lately in a discussion, and I couldn't put a name to it:
a means to use symmetric crypto without exchanging keys:
- Alice encrypts M with key A and sends it to Bob
- Bob encrypts
Lawrence C. Stewart wrote:
...
encryption key should be generated independently for each encryption
and packaged along with the ciphertext. That solves the salt problem
and the cracking the system problem in one step.
I am sorry to differ, but packaging the encryption-key along with
the
[Moderator's note: With this, I'm ending all baggage messages for
now. --Perry]
It will also mean more peace of mind for
passengers worried about reports of increased pilferage from unlocked bags.
... so, TSA people are stealing from unlocked bags.
Not necessarily. I was under the
http://arstechnica.com/news/posts/1069191682.html
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A penny for your bits: micropayments to make a comeback?
Posted 11/18/2003 @ 3:41 PM, by Elle Cayabyab
Remember DigiCash? Did you have Flooz gift certificates or
