ENCRYPTION PROCESSING SYSTEM, KEY GENERATION DEVICE, ENCRYPTION DEVICE, DECRYPTION DEVICE, ENCRYPTION PROCESSING METHOD, AND COMPUTER READABLE RECORDING MEDIUM HAVING ENCRYPTION PROCESSING PROGRAM

摘要

The object is to provide a secure functional encryption scheme having many cryptographic functions. An access structure is constituted by applying the inner-product of attribute vectors to a span program. The access structure has a degree of freedom in design of the span program and design of the attribute vectors, thus having a large degree of freedom in design of access control. A functional encryption process is implemented by imparting the access structure to each of a ciphertext and a decryption key.