This American National Standard defines a suite of schemes designed to facilitate the secure establishment of cryptographic data for the keying of symmetrically keyed algorithms (e.g., TDEA).
ANSI X9.63-2011 history
2011ANSI X9.63-2011 Public Key Cryptography for Financial Services Indstry
2001ANSI X9.63-2001 Key Agreement and Key Management Using Elliptic Curve-Based Cryptography