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US 8,027,923 B2Granted
Certified transmission system
AssigneeZix Corporation
InventorGary G. Liu
Life of this patent
Estimating the term…
Abstract
The invention provides a method and apparatus for transmitting a message from a sender to an intended recipient. The method includes encrypting a message using a symmetric key, sending the encrypted message to an intended recipient without the symmetric key and providing the symmetric key to a third party. If the intended recipient signs and returns to the third party a receipt for the message, the method includes transferring, by the third party, the receipt to the sender and providing the symmetric key to the intended recipient.
Claims18
A method comprising:
- receiving, at a server, a signed receipt and an encrypted symmetric key from an intended recipient, the signed receipt memorializing receipt of an encrypted message by the intended recipient;
- verifying the signed receipt at the server;
- transferring the verified receipt to a sender of the encrypted message;
- and
- providing, from the server to a device associated with the intended recipient, a symmetric key corresponding to the encrypted symmetric key, the symmetric key generated by the sender of the encrypted message.
2 more elements
A method comprising:
- encrypting a message using an encryption key;
- sending, by a processor, the encrypted message to an intended recipient without the encryption key;
- forwarding the encryption key to a third party;
- and
- receiving from the third party a certified receipt verified by the third party indicating receipt of the message by the intended recipient.
2 more elements
A method comprising:
- encrypting a message using a symmetric key;
- computing, by a processor, a hash of the symmetric key;
- generating a representation of the hash of the symmetric key and the message encrypted by the symmetric key;
- and
- time-stamping, by a time-stamping authority, the representation without exposing content of the message to the time-stamping authority.
2 more elements
A method comprising:
- receiving, at a server, a symmetric key from a sender of an encrypted message, the encrypted message being encrypted by the symmetric key;
- receiving, at the server, a receipt from a recipient of the encrypted message;
- determining, by a processor associated with the server, if the receipt has been signed by the recipient;
- forwarding the receipt to the sender if it is determined that the receipt has been signed by the recipient;
- and
- providing the symmetric key to the recipient to decrypt the encrypted message.
3 more elements
Dependencies are inferred from the claim text.