Jet 3: The database password, when set, is stored as plain text in the MDB file header.
Jet 4: The database password, when set, is obfuscated with a simple XOR pattern algorithm based on the file creation date/time (stored inside the file) which is then stored in the MDB file header.
Jet 3 AND 4: The MDB file header itself is further obfuscated with an XOR pattern – although its a constant XOR stream this time.
ACCDB Files: The password is no longer stored as obfuscated plain text in the file header. Instead, a hash is used to check that the user has entered the valid password. The hash is generated from a combination of RC4 and SHA-1 algorithms.
Error class: Enter database password
Error type: Enter database password
Error message: Enter database password
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