| http://www.w3.org/ns/prov#value | - BACKGROUND OF THE INVENTION [0002] The present invention relates in general to cryptography and secure communication via computer networks or via other types of systems and devices, and more particularly to hierarchical, identity-based schemes for encrypting and decrypting communications. [0003] Roughly speaking, identity-based cryptosystems are public key cryptosystems in which the public key of
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