9.1. 规范性参考文献 (Normative References)
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[Bra97] Bradner, S., "RFC 中用于指示需求级别的关键词", BCP 14, RFC 2119, March 1997.
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[DH98] Deering, S. and R. Hinden, "Internet Protocol, Version 6 (IPv6) 规范", RFC 2460, December 1998.
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[Eas04] 3rd Eastlake, D., "Encapsulating Security Payload (ESP) 和 Authentication Header (AH) 的密码算法实现要求", RFC 4305, December 2005.
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[Ken-Arch] Kent, S. and K. Seo, "Internet Protocol 的安全架构", RFC 4301, December 2005.
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[RFC791] Postel, J., "Internet Protocol", STD 5, RFC 791, September 1981.
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[RFC1108] Kent, S., "Internet Protocol 的美国国防部安全选项", RFC 1108, November 1991.