What does MD stand for? Home › Forums › What does MD stand for? This topic contains 0 replies, has 1 voice, and was last updated by BrianMiz 5 months, 1 week ago. Author Posts August 15, 2019 at 2:59 pm #121607 BrianMizMember I’ve been working on MD5 hash decryption (Just for studies, I don’t think that people still use MD5) and found out that a lot of hashed has word MD in the name. For example MD2, MD4, MD5, MD6-128 and etc. My question in what does the “MD” stand for? Author Posts You must be logged in to reply to this topic.