×

Cipher method and system for verifying a decryption of an encrypted user data key

  • US 7,499,552 B2
  • Filed: 01/11/2006
  • Issued: 03/03/2009
  • Est. Priority Date: 01/11/2006
  • Status: Expired due to Fees
First Claim
Patent Images

1. A cipher system, comprising:

  • a processor; and

    a memory storing instructions operable with the processor for verifying a decryption of an encrypted user data key used to encrypt user data prior to an encryption of the user data key with an encryption key, the instructions being executed for;

    intermixing eight bytes of random text with eight bytes of text comprising alphanumeric characters “

    DFSMSDSS”

    to create an intermixed text;

    encrypting the intermixed text with the user data key to create a verification text;

    decrypting the encrypted user data key with a decryption key in response to an initiation of a decryption of the encrypted user data with the user data key as decrypted with the decryption key;

    decrypting the verification text with the user data key as decrypted with the decryption key;

    validating a use of the user data key as decrypted with the decryption key to decrypt the encrypted user data in response to a matched comparison of the verification text as decrypted with the user data key and the intermixed text; and

    invalidating the use of the user data key as decrypted with the decryption key to decrypt the encrypted user data in response to a mismatched comparison of the verification text as decrypted with the user data key and the intermixed text.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×