Re: Collecting entropy from device_attach() times.

看板FB_security作者時間13年前 (2012/09/20 17:32), 編輯推噓0(000)
留言0則, 0人參與, 最新討論串22/80 (看更多)
RW <rwmaillists@googlemail.com> writes: > You're basing a model for all devices on a single sound card, that > doesn't seem safe to me. Isn't it possible that a device could take a > long and well defined time? Please understand that the timers used here have a resolution of around 1e-8 to 1e-10 seconds. You may be able to predict the first six digits with reasonable accuracy - in fact, the first four or five will almost always be 0, except for devices with moving parts - but anything beyond that is a crapshoot, even in a virtual machine. (I am speaking, of course, of decimal digits - multiply by 3.322 for the corresponding number of bits) DES --=20 Dag-Erling Sm=C3=B8rgrav - des@des.no _______________________________________________ freebsd-security@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-security To unsubscribe, send any mail to "freebsd-security-unsubscribe@freebsd.org"
文章代碼(AID): #1GMkAJnX (FB_security)
討論串 (同標題文章)
文章代碼(AID): #1GMkAJnX (FB_security)