Historical
ANSI X9.24-2-2016
Retail Financial Services Symmetric Key Management Part 2: Using Asymmetric Techniques for the Distribution of Symmetric Keys
This part of ANS X9.24 establishes requirements and guidelines for the secure management and application-level interoperability of such automated keying operations. This part of this standard addresses symmetric keys managed with asymmetric keys, and asymmetric keys managed with symmetric keys (as in the storage of private keys encrypted with a symmetric master key for storage as cryptograms on a local database)
Accredited Standards Committee, Inc. - Financial Industry Standards [ascx9]