CRYPTOGRAPHY PROCESSING SYSTEM, KEY GENERATION DEVICE, ENCRYPTION DEVICE, DECRYPTION DEVICE, KEY DELEGATION DEVICE, CRYPTOGRAPHY PROCESSING METHOD AND CRYPTOGRAPHY PROCESSING PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a hierarchical predicate encryption for inner products with improved efficiency in calculation, etc.SOLUTION: A cryptography processing system 10 comprises a key generating device 100, an encryption device 200 and a decryption device 300. The key generating device 100 generates a vector embedded with predicate information vin a base vector of a base Babout each of integers t of t=1 to L, as a decryption key sk. The encryption device 200 generates a vector embedded with attribute information xin a base vector of a base Babout at least part of the integers t out of t=1 to L, as encryption data ct. The decryption device 300 executes a pairing calculation, with respect to the decryption key skgenerated by the key generating device 100 and the encryption data ct generated by the encryption device 200, and decrypts the encryption data ct.