Patent ID: 7986778
Filing Date: 2011-07-26
Classification: H04L

Abstract:
1. A cryptographic method comprising: a first trusted entity, with a first public/private key pair: verifying that a first identifier string is associated with a first party; generating a secret key using its private key and the first identifier string; and providing the secret key to the first party; the first party: using the secret key and a random secret to generate multiple signature components, wherein use of the random secret and the secret key in the signature components enables verification of the first party as origin of the signature components without knowledge of the random secret; encrypting a message by an identifier-based encryption process with encryption parameters comprising the public key of a second public/private key pair associated with a second trusted entity, and a second identifier string comprising at least one condition to be checked by the second trusted entity; and outputting the encrypted message and the signature components.