Kloud Services Cisco Systems, Inc O3b Networks Ciena Corporation Network RADIUS SARL This document describes two new BFD Authentication mechanism, Meticulous Keyed ISAAC, and Meticulous Keyed FNV1A. These mechanisms can be used to authenticate BFD packets, and secure the sequence number exchange, with less CPU time cost than using MD5 or SHA1, with the tradeoff of decreased security. This document updates RFC 5880.