This X9 Technical Report discusses the transition and security issues of migrating from single-length DES to Triple DES and newer technologies which include the following topics: transition from X9.9 Message Authentication Codes (MAC) to newer technology providing integrity protection for wholesale financial messages (or other financial messages) transition from X9.23 Message Encryption to newer technology providing encryption protection for wholesale financial messages (or other financial messages) transition from X9.17 Key Management to newer technology providing key management in support of the wholesale financial industry measures to ameliorate the risks inherent in X9.9, X9.23 and X9.17 during the transition period general use of Message Authentication Codes (MAC) general use of Data Encryption specific use of PIN Encryption general use of Key Management.