Mike, Michael StJohns <mstjo...@comcast.net> writes:
> On 2/8/2017 8:19 AM, Mohit Sethi wrote: >> Hi Mike >> >> At least with our measurements on an 8-bit microprocessor platform, >> 1024-bit RSA exponentiation was extremely slow. Please have a look >> at Table 1: >> >> https://tools.ietf.org/html/draft-ietf-lwig-crypto-sensors-01 > > I look at Table 1 the first thing I see is that you're using the wrong > abbreviation for time - (ms is milli second), what you want is micro > seconds or (us). Or are you actually trying to claim that a 1024 bit > operation takes 199 seconds? Or all of 3+ minutes? Or are you > using an abacus and a monkey to do the math? >From my personal experience working with tiny microcontrollers I would guess that there is NOT a typo in those numbers and it really does take 3 minutes to compute an RSA operation. I've had similar (although somewhat better) results with ECC on similar platforms (166-bit ECC was taking around 30s). Note that this is computation in software. A hardware implementation would certainly be faster, but then you actually need to implement the hardware. > (And by the way - using "3" as the RSA exponent is just wrong). It's done frequently in "lopsided" constrained environments in order to limit the computation required by the more-constrained device. > Table 1 doesn't actually indicate whether this is a signing operation > or a verification operation, or whether or not the summary function > (SHA1 or SHA256) is included. > > If Table 2 and table 3 have the same mistakes in time abbreviation > (and I'm not sure why they wouldn't), you're saying that you can do an > ECDSA function in 2-6 milliseconds. Which more than meets the > requirements. I don't think it's a mistake. > _______________________________________________ > Ace mailing list > Ace@ietf.org > https://www.ietf.org/mailman/listinfo/ace -derek -- Derek Atkins 617-623-3745 de...@ihtfp.com www.ihtfp.com Computer and Internet Security Consultant _______________________________________________ Ace mailing list Ace@ietf.org https://www.ietf.org/mailman/listinfo/ace
