Passwords with Lan Manager (LM) under Windows

From: Cedric.Baechler@vtg.admin.ch
Date: Tue Sep 20 2005 - 06:24:46 EDT


Hi,

Lan Manager (LM) is one of the oldest authentication protocols that Microsoft has used. It was first introduced with Windows 3.11 and is not very secureThe hash is case-insensitive.

* The character set is limited to 142 characters.
* The hash is broken down into 2-7 character chunks. If the password is shorter than 14 characters, the password will be padded with nulls to get the password to 14 characters.
* The hash result is a 128-bit value.
* The hash is one-way function.

Does anyone know which 142-character set is used ?

Thanks in advance,

Cedric

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