Here is an explanation of how the passwords for operating system user profiles are encrypted at each password level:
1. For systems running at QPWDLVL of 0 or 1, the password is used as the key to encrypt a known character string, which is different for each user profile, using the DES (symmetric) algorithm. The password itself is not encrypted nor stored on the system. The data encrypted using the password as the key is what is stored on the system.
2. For systems running at QPWDLVL of 2 or 3, the password is concatenated to a known character string, which is different for each user profile, and is hashed using the SHA-1 algorithm. This is a one-way cryptographic hash algorithm. The resulting hashed value is what is stored on the system.
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