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Dispersed storage secure data decoding

  • US 8,656,187 B2
  • Filed: 08/26/2009
  • Issued: 02/18/2014
  • Est. Priority Date: 04/20/2009
  • Status: Active Grant
First Claim
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1. A method operating on a computer and comprising the steps of:

  • generating, by a processor of the computer, a read command to read at least some of a plurality of data slices from a dispersed storage network;

    de-slicing, by the processor, the at least some of the plurality of data slices using a reverse information dispersal algorithm to produce an all-or-nothing encrypted data segment; and

    applying, by the processor, a reverse all-or-nothing transformation on the all-or-nothing encrypted data segment to recover a data segment, wherein the reverse all-or-nothing transformation includes;

    retrieving an obfuscated encryption key and an encrypted data segment from the all-or-nothing encrypted data segment;

    calculating a digest from the encrypted data segment;

    recovering the encryption key from the obfuscated encryption key based on the digest; and

    decrypting the encrypted data segment based on the encryption key to produce the data segment.

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