Some IPsec references

Some IPsec ressources I was using while developing ipdecap

RFCs

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 Requirement    Encryption Algorithm (notes)
        -----------    --------------------------
        MUST           NULL [RFC2410] (1)
        MUST           AES-CBC with 128-bit keys [RFC3602]
        MUST-          TripleDES-CBC [RFC2451]
        SHOULD         AES-CTR [RFC3686]
        SHOULD NOT     DES-CBC [RFC2405] (2)

        Requirement    Authentication Algorithm (notes)
        -----------    -----------------------------
        MUST           HMAC-SHA1-96 [RFC2404] (3)
        SHOULD+        AES-XCBC-MAC-96 [RFC3566]
        MAY            NULL (1)
        MAY            HMAC-MD5-96 [RFC2403] (4)

Authentication

Encryption