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  Method and apparatus for encrypting dataRelated Patent Categories: Electrical Computers And Digital Processing Systems: Support, Data Processing Protection Using CryptographyThe Patent Description & Claims data below is from USPTO Patent Application 20070180267. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001] The present invention relates to a method and system for encrypting data. BACKGROUND [0002] Escrow and PKI encryption are two techniques that have been utilised to allow information to be removed from the control of the information owner while still preventing other parties having access to the information until a predetermined condition has been met. [0003] Two common examples where these techniques have been used are in sealed bids and music distribution. Seal bids require that all bids are submitted by a specified date where the originator of the bid needs to be satisfied that their bid is not disclosed before the specified date. Music distributors may wish to publish their music on a public database, where the music distributors needs to be satisfied that the intended user of the music can not listen to the music until they have paid for the use of the music. However, the setting up and use of escrow and PKI encryption can be complex. [0004] It is desirable to improve this situation. SUMMARY OF THE INVENTION [0005] In accordance with a first aspect of the present invention there is provided a method for encrypting data comprising deriving a public key using a first data set that defines an instruction and a second data set associated with the third party; encrypting a third data set with the public key; providing the encrypted third data set to a recipient; providing the public key to the third party such that on satisfaction of the instruction the third party provides an associated private key to the recipient to allow decryption of the encrypted third data set. [0006] In accordance with a second aspect of the present invention there is provided a method for encrypting data comprising deriving a public key using a first data set that defines a term of an agreement and a second data set associated with a third party; encrypting a third data set with the public key; providing the encrypted third data set to a recipient; providing the public key to the third party such that on satisfaction of the term of the agreement the third party provides an associated private key to the recipient to allow decryption of the encrypted third data set. [0007] Preferably a term of the agreement that needs to be satisfied is that the private key should not be released to the recipient until a specified date. [0008] Preferably a term of the agreement that needs to be satisfied to allow release of the private key to the recipient is the making of a payment. [0009] Most preferably the encrypted third data set includes a nonce. [0010] In accordance with a third aspect of the present invention there is provided a computer system for encrypting data comprising a first computer entity for deriving a public key using a first data set that defines a term of an agreement and a second data set associated with a third party and encrypting a third data set with the public key; communication means for providing the encrypted data to a second computer entity and the public key to a third computer entity; wherein the third computer entity is arranged, on satisfaction of the term of the agreement, to provide an associated private key to the second computer entity to allow decryption of the encrypted third data set. [0011] In accordance with a forth aspect of the present invention there is provided a computer system for encrypting data comprising a first computer node for deriving a public key using a first data set that defines an instruction and a second data set associated with the third party and encrypting a third data set with the public key; communication means for providing the encrypted data to a second computer node and the public key to a third computer node; wherein the third computer node is arranged, on satisfaction of the instruction to the third party, to provide an associated private key to the second computer node to allow decryption of the encrypted third data set. [0012] In accordance with a fifth aspect of the present invention there is provided a computer apparatus for encrypting data comprising a processor for deriving a public key using a first data set that defines a term of an agreement and encrypting a second data set with the public key. [0013] In accordance with a sixth aspect of the present invention there is provided a computer apparatus for encrypting data comprising a processor for deriving a public key using a first data set that defines an instruction and encrypting a second data set with the public key. BRIEF DESCRIPTION OF THE DRAWINGS [0014] For a better understanding of the present invention and to understand how the same may be brought into effect reference will now be made, by way of example only, to the accompanying drawings, in which: [0015] FIG. 1 illustrates a computer system according to an embodiment of the present invention; [0016] FIG. 2 illustrates a computer system arranged to support a sealed bid according to an embodiment of the present invention; [0017] FIG. 3 illustrates a computer system arranged to support a music distribution system according to an embodiment of the present invention. DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE PRESENT INVENTION [0018] The present invention addresses the issue of controlling access to data, where the owner/originator of the relevant data wishes to place conditions on the access to the data. This is achieved by using a public key to encrypt the data where the public key itself stipulates the conditions under which access should be granted. [0019] FIG. 1 illustrates a computer system 10 according to an embodiment of the present invention. Computer system 10 includes a first computer entity 11, a second computer entity 12 and a third computer entity 13. Typically the three computer entities would be configured on separate computer platforms, however the computer entities 11, 12, 13 could be configured on a single computer platform. For the purposes of this embodiment, however, the three computer entities 11, 12, 13 are coupled via the internet 14. Continue reading... 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