I read: http://www.google.com/patents/US7215773
and I find: In RSA or Rabin signatures there are generally three routines, namely key pair generation, signature generation and signature verification. Validating an RSA public key (n, e) involves three steps. Firstly validate e, secondly validate n and thirdly validate e and n are consistent with each other. In order to validate the public exponent e, use of made of the fact that the exponent 2<=e<=2(k I can not speculate as to whether there is prior art, but it seems to match what we have been discussing. -- Michael Richardson <mcr+i...@sandelman.ca>, Sandelman Software Works
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