NSA Spy Machine and DES
Ian Farquhar
ianf at simple.sydney.sgi.com
Thu Aug 18 15:12:46 PDT 1994
On Aug 18, 4:41pm, Peter Wayner wrote:
> But let's give the NSA/SRC some credit. These new SIMD processors are
probably
> smarter. Let's say that they're 64 bit wide RISC machines which can only
> access their own local on chip memory. If they can run 2 times faster (100
> MHz) and do DES encryption in 1000 cycles, then this means that the brute
> force attack on DES could be done in 4 days. Bam.
Actually, I would be surprised if the "SIMD" processors were not a huge
array of reprogrammable FPGA's, quite possibly Xilinx's. The possibilities
of a large array of these chips, each with local memory, is quite
interesting. I have personally seen an array of 64 Xilinx chips in a DEC PeRL
box doing RSA, at speeds similar or better to almost all available custom
hardware implementations of the cipher.
BTW, with a purchase of half a million chips, economies of scale would get
the devices well within budget.
Ian.
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