Pre-Grant Publication Number: 20070160202
Filing Date: January 11, 2020
Inventors: Andrew Wilt, Michael Kelly
Assignee: International Business Machines Corporation
Current U.S. Classification: 380, 380/030000
View Prior Art for Claim 00015
A cipher method 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 cipher method comprising:
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 description key;
decrypting a 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 an intermixing of a known text and a random 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 intermixing of the known text and the random text.
Title Password-based Encryption for S/MIME
Description
Password-based key wrapping is a two-stage process, a first stage in
which the user-supplied password is converted into a KEK, and a second
stage in which the KEK is used to encrypt a CEK.
Title Cryptographic Message Syntax
Description
IETF RFC document (RFC 2630) specifying cryptographic message syntax.
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