full-disclosure - Re: DakaRand

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Message-ID: <CAEW7ACkd82zqRksu7RN=ukNQJF2zWqp-d3ms3+6hZCksL41giA@mail.gmail.com>
Date: Mon, 20 Aug 2012 09:35:54 -0700
From: Dan Kaminsky <dan@...para.com>
To: Paul Schmehl <pschmehl_lists@...rr.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: DakaRand

On Mon, Aug 20, 2012 at 9:29 AM, Paul Schmehl <pschmehl_lists@...rr.com>wrote:

> --On August 20, 2012 8:32:59 AM -0700 Dan Kaminsky <dan@...para.com>
> wrote:
>
>
>>
>>
>> On Mon, Aug 20, 2012 at 8:29 AM, Paul Schmehl <pschmehl_lists@...rr.com>
>> wrote:
>>
>>
>> --On August 20, 2012 2:22:28 AM -0700 Dan Kaminsky <dan@...para.com>
>> wrote:
>>
>>
>> May I ask what FreeBSD's entropy sources are?
>>
>>
>> I'm surprised you don't already know.  From device noise.
>>
>>
>>
>>
>> Which class?  There are many sorts of said noise (most of which I
>> believe actually work).
>>
>>
> The long answer is look at /usr/src/sys/sys/random.h.
>
> The short answer is:
> /* Allow the sysadmin to select the broad category of
> * entropy types to harvest
> */
> struct harvest_select {
>         int ethernet;
>         int point_to_point;
>         int interrupt;
>         int swi;
> };
>
> swi is software interrupt handlers.  interrupt is hardware interrupts
> (e.g. usb, pci, etc.)
>

Neat.  What's the default, and what does it mine?  Count?  Nanosecond time?


>
> *If* you install a hardware PRNG, FreeBSD will use that instead (by
> default).


Excellent.

>
>
> --
> Paul Schmehl, Senior Infosec Analyst
> As if it wasn't already obvious, my opinions
> are my own and not those of my employer.
> *********************************************
> "It is as useless to argue with those who have
> renounced the use of reason as to administer
> medication to the dead." Thomas Jefferson
> "There are some ideas so wrong that only a very
> intelligent person could believe in them." George Orwell
>
>

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