| 摘要 |
PROBLEM TO BE SOLVED: To send a security protection message by using a public encryption key. SOLUTION: A transmitter side uses an own public encryption key Ex to encrypt a message (c) and sends the encrypted message Ex (c) to a receiver side. The receiver side uses an encryption key Ey of an object recipient of the message to encrypt the encrypted message Ex (c) and to make a message Ey (Ex(c)) and sends the message Ey(Ex(c)) to the transmitter side. The transmitter side uses its own secret decoding key to decode the message Ey (Ex(c)) and to make Dx(Ey(Ex(c))=Ey(c) and sends the message Ey(c) to the receiver side. When the receiver side is an object recipient of the message, the receiver side uses its own decoding key Dy to decode the message and to make Dy(Ey(c))=c and when the receiver side is not an objective recipient of the message, the receiver side sends it to the recipient and the recipient uses its own decoding key Dy to decode the message.
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