> With microsecond timestamps, 64second ntp poll period we are talking > about approx 10 bits of randomness in the received packet and about > 3 bits of randomness in the clock difference. > > FreeBSD uses nanosecond timestamping (Actually could do nanoseconds > with 32 bitfractions), but that only adds about 4 bits to the clock > difference due to the clock frequency end interrupt hardware. So the attacker is down to 17 bits == 128k guesses. Now that is good entropy, but we need to know what the attacker can see inside the packet etc. How else can he reduce his keyspace? > No, it is not policy to try to get as many random bits as we can > by default. It would be policy to *not* do so for some obscure > principle of scientific purity. Pray explain? M -- Mark Murray Join the anti-SPAM movement: http://www.cauce.org To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
- Re: randomdev entropy gathering is really weak Jeroen C. van Gelderen
- RE: randomdev entropy gathering is really weak David Schwartz
- Re: randomdev entropy gathering is really weak Jeroen C. van Gelderen
- Re: randomdev entropy gathering is really weak Poul-Henning Kamp
- Re: randomdev entropy gathering is really weak Mark Murray
- Re: randomdev entropy gathering is really weak Poul-Henning Kamp
- Re: randomdev entropy gathering is really weak Jeroen C. van Gelderen
- Re: randomdev entropy gathering is really weak Poul-Henning Kamp
- Re: randomdev entropy gathering is really weak Jeroen C. van Gelderen
- Re: randomdev entropy gathering is really weak Poul-Henning Kamp
- Re: randomdev entropy gathering is really weak Mark Murray
- Re: randomdev entropy gathering is really weak Louis A. Mamakos
- Re: randomdev entropy gathering is really weak Mark Murray
- Re: randomdev entropy gathering is really weak Poul-Henning Kamp
- Re: randomdev entropy gathering is really weak Mark Murray
- Re: randomdev entropy gathering is really weak Poul-Henning Kamp
- Re: randomdev entropy gathering is really weak Mark Murray
- Re: randomdev entropy gathering is really weak Poul-Henning Kamp
- Re: randomdev entropy gathering is really weak Mark Murray
- Re: randomdev entropy gathering is really weak Poul-Henning Kamp
- Re: randomdev entropy gathering is really weak Warner Losh