16 reputation
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bio website
location Santa Clara, CA
age
visits member for 1 year, 5 months
seen Sep 12 '13 at 14:19

Sr. Firmware engineer. Mostly retired.


Sep
24
awarded  Autobiographer
Jul
8
comment Is there a problem with this non-ECDSA message signing?
Thanks for all the help. My plan is to use EC-KCDSA from Guide to Elliptic Curve Cryptography Hankerson etal section 4.4.3. Its charm is that no %q math is required to verify a signature. Creating the signature (which requires %q) can be on the host desktop computer. EC-KCDSA has its (secret, public) key pair not (a, aG) but instead uses (a, (1/a)G). That’s annoying but tolerable. Star topology network. Information from pod to desktop host, if encrypted at all, can use ECDH. Commands that, for example, open a sewage gate must not be assessable to any hacker with a WiFi laptop.
Jul
7
awarded  Student
Jul
7
comment Is there a problem with this non-ECDSA message signing?
THANK YOU. I am inexperienced when it comes to public key cryptography. But once I saw how it was secure I understood. Of course, I could encrypt using ECDH. But that only validates the sender to a specific node. What I was trying to do was to sign a message that anyone could verify without needing %q arithmetic. q being the order of the curve. I could implement %q arithmetic for the product of two field elements and the multiplicative inverse %q but would rather not. Is there a secure signature scheme that only relies on point multiplication?
Jul
7
comment Is there a problem with this non-ECDSA message signing?
I am planning to use ARM Cortex-M4 microcontrollers (~US$10) to control remote devices. My point multiply takes ~25 milliseconds which is fast enough. The Intel Nehalem/Westmere devices would destroy both my cost and power budgets.
Jul
6
asked Is there a problem with this non-ECDSA message signing?
Jul
5
comment Is this ECC encryption key sharing method okay?
Thank you CodesInChaos. Hashing sounds good. I was already planning on providing an IV for AES in counter mode. I will hash Cx and the IV. Message length remains small. But anyone, is the method less secure than ECIES?
Jul
5
asked Is this ECC encryption key sharing method okay?