Strengthened public key protocol

摘要

A method of determining the integrity of a message exchanged between a pair of correspondents. The message is secured by embodying the message in a function of a public key derived from a private key selected by one of the correspondents. The method comprises first obtaining the public key. The public key is then subjected to at least one mathematical test to determine whether the public key satisfies predefined mathematical characteristics. Messages utilizing the public key are accepted if the public key satisfies the predefined mathematical characteristics.

主权项

1. A method performed by a computing device in a communication system, the method comprising:
obtaining a public key; testing, by a computing device, whether said public key is equal to an identity element of a prime-order subgroup associated with said communication system; rejecting said public key if said public key equals said identity element; and performing a cryptographic operation associated with the public key, the cryptographic operation comprising at least one of: a verification of a signature using the public key; a key agreement scheme; enciphering a symmetric key with the public key; and a certification of the public key.