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- 1RFC 5709 on OSPF HMAC-SHA authentication revisited●RFC 5709 defining HMAC-SHA cryptographic authentication for the OSPF protocol was published in October 2009 https:// cro
RFC 5709, published in October 2009, defines how OSPF routing protocol messages are authenticated using the HMAC-SHA cryptographic scheme. Networking commentary is revisiting the standard and explaining how cryptographic authentication works for OSPFv2, highlighting its role in securing routing infrastructure against spoofed route advertisements.