| 摘要 |
A method and system for electronic messaging in which a sender (100) of an electronic message (224) receives a return receipt (230), without having to send the message contents to a third party. The sender (100) contacts a server (106) to obtain an encryption key to encrypt the message. The server (106) returns an encryption key (312) along with key retrieval information (314) to the sender (100). The key retrieval information (314) can be used to obtain from the server (106) the decryption key (332) corresponding to the returned encryption key (312). The sender (100) encrypts the message (604), along with the key retrieval information (314), to the recipient (102). The recipient (102) sends the key retrieval information (314) to the server (106) to receive the corresponding decryption key (332). The recipient (102) then decrypts the encrypted message (720) received from the sender (100) using the decryption key (332). When the recipient (102) sends a request to obtain the decryption key (332), the server (106) notifies the sender (100) when the key has been successfully retrieved. The fact that the decryption key (332) was retrieved by the recipient (102) indicates to the sender (100) that the recipient (102) received the message. |
