Patent ID: 7676674

Claim:
A method of secure communication of an electronic document from sender to recipient, verification of sending of the electronic document by the sender and verification of the receipt of the electronic document by the recipient, in association with at least one third party, comprising the steps of: the sender generating a document and an abstract of the document; the sender generating a first encrypted message by encrypting a first message portion with a first encryption key, said first message portion including at least said abstract and a second encryption key; the sender generating a second encrypted message by encrypting a second message portion with said second encryption key, said second message portion including at least said abstract and said document; the sender generating a third encrypted message by encrypting a third message portion with a third encryption key, said third message portion including at least said abstract and said second encryption key; the sender transmitting said first encrypted message to the third party; the sender transmitting said second and third encrypted messages to the recipient; the recipient decrypting said third encrypted message to obtain said abstract and said second encryption key; the recipient using said second encryption key, derived from decrypting said third encrypted message, to decrypt said second encrypted message to obtain said abstract and said document; and if said abstract from said step of decrypting said third encrypted message is identical to said abstract from said step of decrypting said second encrypted message, then giving the recipient access to said document and reporting the access to said third party.