At 11:13 PM 10/20/96 -0600, C Kuethe wrote:
On Sun, 20 Oct 1996, Bill Frantz wrote:
(3) The devil is in the details. I still am not convinced that MacPGP has enough sources of entropy for its IDEA key generation. (But I am not convinced that it doesn't either.) I put integrating Jon Callas's entropy manager into MacPGP as a high priority.
Tell me more... I use macpgp. I just built some new keys tonight, a 2048 bit monster. PGP wanted 1496 bits of rand info... where is it's entropy "Hole"
And what is the "Entropy Manager"?
When you build RSA keys in PGP it uses keyboard timings to acquire "true randomness" or entropy. This kind of randomness is related to quantum mechanical uncertainty. It probably has enough entropy to safely generate RSA keys by the keyboard technique it uses. In addition to RSA keys, it generates symmetric IDEA keys whenever you send a message. It uses keystrokes accumulated during normal operation and saved in a file called randpool (or something like that) to generate these keys. Since you almost never enter keystrokes during the normal operation of MacPGP, I am concerned that randpool does not have enough entropy. Entropy Manager is a program Jon Callas of Apple is working on. It uses well-known sources of entropy in the computer to build up a pool of entropy for use by programs that need it. The last I heard, it was nearly ready. I would trust it more than the ported PGP since Jon has examined sources available in the Macintosh specifically. ------------------------------------------------------------------------- Bill Frantz | Tired of Dole/Clinton? | Periwinkle -- Consulting (408)356-8506 | Vote 3rd party. I'm | 16345 Englewood Ave. frantz@netcom.com | Voting for Harry Browne | Los Gatos, CA 95032, USA