Systems and methods for conducting transactions and communications using a trusted third party

• US 9,123,043 B2
• Filed: 11/04/2013
• Issued: 09/01/2015
• Est. Priority Date: 04/20/2001
• Status: Expired due to Fees

• Current Assignee: Intertrust Technologies Corporation (Fidelio Acquisition Co LLC)
• Original Assignee: Intertrust Technologies Corporation (Fidelio Acquisition Co LLC)
• Inventors: Pinkas, Binyamin, Sander, Tomas, Horne, William G.
• Primary Examiner(s): Cheung, Mary
• Application Number:
  US14/071,574
• Publication Number:
  US 20140058952A1
• Time in Patent Office: 666 Days
• US Class Current: 1/1
• CPC Class Codes: G06Q 20/02 involving a neutral party, e.g. certification authority, notary or trusted third party [TTP]
• CPC Class Codes: G06Q 20/3829 involving key management
• CPC Class Codes: G06Q 20/401 Transaction verification
• CPC Class Codes: G06Q 2220/00 Business processing using cryptography
• CPC Class Codes: G06Q 30/06 Buying, selling or leasing transactions

Abstract

Systems and methods are provided for performing transactions and managing communications using a trusted third party. In one embodiment, a sender transfers an encrypted version of a file (such as a digitally encoded audio track, movie, document, or the like) to someone who wishes to receive it. The receiver computes a first hash of at least a portion of the encrypted data content, and sends the first hash to a third party configured to compare at least a portion of the first hash to at least a portion of a second hash. The receiver receives a file decryption key from the third party, and decrypts at least the portion of the received encrypted data content with the decryption key. In some cases, multiple hashes of the encrypted data content may be computed, each using a different portion of the encrypted data content.

Claims

1. A method performed by a computer system associated with a first party, the computer system comprising a processor and a memory encoded with program instructions that, when executed by the processor, cause the computer system to perform the method, the method comprising:

receiving a first plurality of encoded content blocks from a second party computer system, the first plurality of encoded content blocks being associated with a plurality of blocks of a piece of content;

receiving a message comprising a second plurality of encrypted encoded content blocks and an encrypted first encryption key from a third party computer system, the second plurality of encrypted encoded content blocks being encrypted using the first encryption key, the encrypted first encryption key being encrypted using a second encryption key associated with the first party;

decrypting the encrypted first encryption key using the second encryption key to obtain the first encryption key;

decrypting the second plurality of encrypted encoded content blocks using the first encryption key to obtain a second plurality of decrypted encoded content blocks;

comparing at least one block of the second plurality of decrypted encoded content blocks with at least one block of the first plurality of encoded content blocks; and

determining whether the third party computer system has possession of the first plurality of encoded content blocks based at least in part on the comparison.

2. The method of claim 1, wherein the first plurality of encoded content blocks are encoded from the plurality of blocks of the piece of content using an error correction code.

3. The method of claim 1, wherein a number of blocks of the first plurality of encoded content blocks is less than a number of blocks of the plurality of blocks of the piece of content.

4. The method of claim 1, wherein a number of blocks of the second plurality of encrypted encoded content blocks is less than a number of blocks of the first plurality of encoded content blocks.

5. The method of claim 1, wherein the second encryption key comprises a public encryption key associated with the first party.

6. The method of claim 1, wherein the determining whether the third party computer system has possession of the first plurality of encoded content blocks comprises determining that the at least one block of the second plurality of decrypted encoded content blocks matches the at least one block of the first plurality of encoded content blocks.

7. The method of claim 1, wherein the comparing comprises comparing each block of the second plurality of decrypted encoded content blocks with at least one block of the first plurality of encoded content blocks.

8. The method of claim 1, wherein the message further comprises information associating the second plurality of encrypted encoded content blocks with the first plurality of encoded content blocks.

9. The method of claim 8, wherein comparing at least one block of the second plurality of decrypted encoded content blocks with at least one block of the first plurality of encoded content block is performed using the information.

10. The method of claim 1, wherein the determining comprises determining that the third party computer system has possession of the first plurality of encoded content blocks and the method further comprises:

transmitting the first encryption key to the third party computer system.

11. A non-transitory computer-readable storage medium storing instructions that, when executed by a processor included in a first party computer system, cause the first party computer system to perform a method comprising:

receiving a first plurality of encoded content blocks from a second party computer system, the first plurality of encoded content blocks being associated with a plurality of blocks of a piece of content;

receiving a message comprising a second plurality of encrypted encoded content blocks and an encrypted first encryption key from a third party computer system, the second plurality of encrypted encoded content blocks being encrypted using the first encryption key, the encrypted first encryption key being encrypted using a second encryption key associated with the first party computer system;

decrypting the encrypted first encryption key using the second encryption key to obtain the first encryption key;

decrypting the second plurality of encrypted encoded content blocks using the first encryption key to obtain a second plurality of decrypted encoded content blocks;

comparing at least one block of the second plurality of decrypted encoded content blocks with at least one block of the first plurality of encoded content blocks; and

determining whether the third party computer system has possession of the first plurality of encoded content blocks based at least in part on the comparison.

12. The non-transitory computer-readable storage medium of claim 11, wherein the first plurality of encoded content blocks are encoded from the plurality of blocks of the piece of content using an error correction code.

13. The non-transitory computer-readable storage medium of claim 11, wherein a number of blocks of the first plurality of encoded content blocks is less than a number of blocks of the plurality of blocks of the piece of content.

14. The non-transitory computer-readable storage medium of claim 11, wherein a number of blocks of the second plurality of encrypted encoded content blocks is less than a number of blocks of the first plurality of encoded content blocks.

15. The non-transitory computer-readable storage medium of claim 11, wherein the second encryption key comprises a public encryption key associated with the first party computer system.

16. The non-transitory computer-readable storage medium of claim 11, wherein the determining whether the third party computer system has possession of the first plurality of encoded content blocks comprises determining that the at least one block of the second plurality of decrypted encoded content blocks matches the at least one block of the first plurality of encoded content blocks.

17. The non-transitory computer-readable storage medium of claim 11, wherein the comparing comprises comparing each block of the second plurality of decrypted encoded content blocks with at least one block of the first plurality of encoded content blocks.

18. The non-transitory computer-readable storage medium of claim 11, wherein the message further comprises information associating the second plurality of encrypted encoded content blocks with the first plurality of encoded content blocks.

19. The non-transitory computer-readable storage medium of claim 18, wherein comparing at least one block of the second plurality of decrypted encoded content blocks with at least one block of the first plurality of encoded content block is performed using the information.

20. The non-transitory computer-readable storage medium of claim 11, wherein the determining comprises determining that the third party computer system has possession of the first plurality of encoded content blocks and the method further comprises:

transmitting the first encryption key to the third party computer system.