Re: Code breakers beat security scheme of car locks, gas pumps

From: Ian Stirling (root_at_mauve.demon.co.uk)
Date: 02/06/05 

Date: 06 Feb 2005 11:01:06 GMT

Uncle Al <UncleAl0@hate.spam.net> wrote:
> Ian Stirling wrote:
>>
>> Uncle Al <UncleAl0@hate.spam.net> wrote:
>> > Ian Stirling wrote:
>> >>
>> >> Uncle Al <UncleAl0@hate.spam.net> wrote:
>> >> > Ian Stirling wrote:
>> >> <sniop>
>> >> >> However, it depends on the resources of the attacker.
>> >> >> I'm not very worried if it takes ten thousand PCs a year to crack one car.
>> >> >
>> >> > Once the algorithm is broken you eavesdrop on cantu or respondu.
>> >>
>> >> Which doesn't matter.
>> >> If it costs you $1M to crack a car code, then unless you've got a very
>> >> special car, it's not a problem.
>> >>
>> >> (However, I note that it takes about 20 PC-weeks to crack a key, with
>> >> non-special hardware)
>> >> Or not that large an investment.
>> >
>> > If you run in Linux, 1.4X faster than in Windows. If you run in AMD,
>> > then 1.4X faster than in Intel. My new iron, an Athlon 55FX
>>
>> Unless you know the algorithm, you can't generalise.
>> On some Intel may be faster, on some AMD.
>> I'd hesitate to say windows may be faster, as if it is, it's usually possible
>> to modify linux to be as fast.
>
<snip>
> The fastest Pentium mobo has a 1.2 GHz memory controller. My AMD 55FX
> has a 2.6 GHz memory controller - inside the CPU not plumbed into the
> mobo. The much larger and more efficient AMD memory caches mean a lot
> of the bytes wandering through a Pentium system never leave an AMD CPU
> until they are done. AMD uses DDR RAM that is wickedly fast at a fair
> price. Pentiums use DDR2 RAM "that has the potential to exceed DDR
> RAM in speed" and costs like sin.

And in many cases, the random access speed of a single byte of memory has
barely changed (3-4 times) since the days of the 386/20.

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