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IS-IS Provides for HMAC-MD5 While there are no openly published attacks on that mechanism, some reports [Dobb96a, Dobb96b] create concern about the ultimate strength of the MD5 cryptographic hash function. Further, some end users, particularly several different governments, require the use of the SHA-1 hash function rather than any other such function for policy reasons. TLV – Value field has Auth Type defined for HMAC-MD5 |