Constructive Channel Key
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United States of America Patent
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N/A
Issued Date -
Apr 16, 2009
app pub date -
Oct 6, 2008
filing date -
Oct 5, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method of generating a constructive channel key includes providing an issuer with a card public key as the keying part of a CKM credential. An ephemeral key pair is computed by the issuer using pre-established enterprise domain parameters. A shared value for the ephemeral private key and the card public key is computed using D-H key agreement. The ephemeral private key is destroyed. The shared value is combined with a static key value. The static key value is split into four blocks. The first block is truncated to be used for a session encryption key. The second block is truncated to be used for a session MAC key. The third block is truncated to be used for a session key encryption key. The fourth block is truncated to be used for an initial IVEC.
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