# Appendix A References The following documents may be used to provide additional details about the device and this security policy: * DynaFlex II Go Installation and Operation Manual * DynaFlex II Go Programmer’s Manual (COMMANDS) * DynaFlex II Go Device Inspection Document * DynaFlex II Go Package Inspection Document * NIST SP 800-57-1 Recommendation for Key Management * ANS X9.24 Part 3:2017, Retail Financial Services Symmetric Key Management, Part 3: Derived Unique Key Per Transaction Using Symmetric Techniques * X9 TR-31:2010, Interoperable Secure Key Exchange Key Block Specification for Symmetric Algorithms --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://developer.magtek.com/hardware/card-readers/mms-dyna-devices/emv-common-kernel/dynaflex-ii-go/documents/compliance-documentation/pci-pts-poi-security-policy/appendix-a-references.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.