| 摘要 |
#CMT# #/CMT# The method involves generating a symmetric encryption key (k) by an encryption key generator (23) and generating a cryptogram (Hdr) associated to the encryption key based on a public key, identity parameters of receiver entity and an integer chosen by a transmitting entity (2). The cryptogram is generated so as to provide access to the encryption key by combination with the public key, the parameters and a private key of receiver entity. A message is encrypted in the entity (2) using the encryption key, and the cryptogram and the encrypted message(C-M) are broadcasted from the entity (2). #CMT# : #/CMT# Independent claims are also included for the following: (1) an encryption device, comprising a memory (2) a decryption device, comprising a memory for containing a public key (3) a computer program for encryption device, comprising instructions for implementing encryption operation of identity based cryptographic method (4) a computer program for decryption device, comprising instructions for implementing decryption operation of identity based cryptographic method (5) a data medium for recording a program for implementing decryption operation of identity based cryptographic method. #CMT#USE : #/CMT# Identity based cryptographic method for encrypting and decrypting data or electronic message. #CMT#ADVANTAGE : #/CMT# The method permits the encryption of the electronic message using the encryption key based on the number of recipients, irrespective of number of integers chosen by the transmitting entity. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a block diagram of an encryption device.'(Drawing includes non-English language text)' C-M : Encrypted electronic message Hdr : Cryptogram k : Symmetric encryption key 2 : Transmitting entity 20 : Memory 21 : Message source 22 : Encrypting circuit 23 : Encryption key generator. |
