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Method and system for delivering secure e-mail

  • US 20030084347A1
  • Filed: 09/30/2002
  • Published: 05/01/2003
  • Est. Priority Date: 01/16/2000
  • Status: Active Grant
First Claim
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1. A method for increasing the privacy of an e-mail message (M), comprising the steps of:

  • providing a central Server (PS) which stores concordance tables between decryption key (K) data and the different identification given to them by different users;

    at the Sender'"'"'s terminal, encrypting a message using an encryption key A, and sending by e-mail the encrypted message (EM) to the Recipient;

    providing the Recipient with a Partial encryption/decryption Key (PK), which is the decryption key for said encrypted message (EM) modified by a given Operator (OP);

    sending by the Sender'"'"'s terminal to said central Server (PS) an Operator Identification (OIi) belonging to the Sender, which identifies the Operator (OP) employed by the Sender to generate the Partial encryption/decryption key (PK), and which is obtained from the Operator Table stored at the Sender'"'"'s end;

    at the Server (PS), obtaining the Operator (OP) from the Sender Operators Table (ST) stored at the Server, using the Operator Identification of the Sender (OIi) sent to the Server by the Sender'"'"'s terminal;

    at the Server (PS), obtaining the Operator Identification of the Recipient (OI), from the Recipient Operators Table (RT) stored at the Server, using the Operator (OP);

    sending to the Recipient its Operator Identification (OIo), together with any additional data associated with the sender, or the recipient or the message;

    at the Recipient, receiving the encrypted message (EM) and the Partial encryption/decryption Key (PK) from the Sender, and the Operator Identification (OIo) from the Server;

    extracting the Operator (OP) using the Operator Table stored at the Recipient'"'"'s end, and generating therewith the decryption Key from the Partial Key; and

    decrypting the encrypted e-mail message (EM).

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