What is Lan management authentication

 The LM authentication protocol, also known as LAN Manager and LANMAN, was invented by IBM and used extensively by Microsoft operating systems prior to NT 4.0. It uses a password encrypting technology that is now considered insecure.


LM works by creating a "hash" of your password, as follows:

Breaking the password into seven-character chunks: If the password length is not a multiple of seven (i.e., 7, 14, 21, 28...), LM pads the remainder of each chunk with zeroes to make it a full seven bytes long. For example, a ten-letter-long password would be divided into a seven-character-long chunk and a three-character-long one, and the smaller one would have zeroes added to it to push it up to seven characters.

Mapping all lowercase letters into uppercase: For example, Dog becomes DOG.
Encrypting each chunk: LM uses each chunk as a 56-bit DES (a standardized cipher standard) key to encrypt the following string: KGS!@#$%.
Concatenating those strings (i.e., linking them end-to-end).

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