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AssigneeMurata Kikai Kabushiki Kaisha
InventorsMasao Kasahara, Yasuyuki Murakami
Estimating the term…
A novel cryptographic communication system including ID-NIKS system with high security. Secret key generation functions and key sharing functions are not separable. Key sharing is also probabilistically possible. A center uses entity-specific random numbers and entity-specific public keys based on ID information for each entity to generate two types of secret key (vectors s and t) in which two numbers serve as the moduli, respectively. The center then sends these secret keys to each entity, and each entity uses these two types of its own entity-specific secret key sent from the center and disclosed public key of another entity (the entity who receives a ciphertext or sends a ciphertext) to generate a common key that is shared by two entities for use in the encrypting of a plaintext into a ciphertext and in the decrypting of a ciphertext into a plaintext.
A cryptographic communication method for communication of information between entities, in which an entity-specific secret key is generated at a center and sent to each entity from the center, one entity uses a common key determined from its own entity-specific secret key sent from the center and a publicly known public key of the other entity to encrypt a plaintext into a ciphertext and transmits the ciphertext to the an other entity, and the other entity uses the same common key as said common key, determined from its own entity-specific secret key sent from the center and a publicly known public key of the one entity, to decrypt said ciphertext sent from the one entity back into a plaintext,
An encryption method, in which secret keys are sent to a plurality of entities, said secret keys being specific to the entities to which they are sent, and said entities use their own said entity-specific keys to encrypt a plaintext into a ciphertext,
A cryptographic communication system including a plurality of entities, in which encryption into a ciphertext of a plaintext to be transmitted, and decryption of the transmitted ciphertext back into a plaintext, are performed mutually between the plurality of entities,
A cryptographic communication method for communication of information between entities, in which an entity-specific secret key is generated at a center and sent to each entity from the center, one entity uses a common key determined from its own entity-specific secret key sent from the center and a publicly known public key of an other entity to encrypt a plaintext into a ciphertext and transmits the ciphertext to the an other entity, and the other entity uses the same common key as said common key, determined from its own entity-specific secret key sent from the center and a publicly known public key of the one entity, to decrypt said ciphertext back into the plaintext,
An encryption method, in which secret keys are sent to a plurality of entities, said secret keys being specific to the entities to which they are sent, and said entities use their own said entities-specific keys to encrypt a plaintext into a ciphertext,
A cryptographic communication system including a plurality of entities, in which encryption into a ciphertext of a plaintext to be transmitted, and decryption of the transmitted ciphertext back into the plaintext, are performed mutually between the plurality of entities,
Dependencies are inferred from the claim text.