EIGRP supports Message Digest 5 (MD5) hashing to ensure the integrity of EIGRP messages and to prevent the injection of false routing information into the EIGRP domain. Message Digest (or MD) algorithms are a series of byte-oriented cryptographic hash functions that take variable-length data and produce a mathematically computed 128-bit fixed-length hash value. This hash is commonly referred to as the fingerprint, message digest, or simply just as the digest. One significant advantage to hashing plaintext is that the original message cannot be reconstituted even with knowledge of the hash algorithm.
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