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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
First Claim
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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.

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