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Explores the IBM i (OS/400) operating system, tracing its origins from the AS/400 platform and explaining its unique architecture where the Db2 relational database is integrated directly into the kernel.
Analyzes the QSYRUPWD API on IBM i, revealing that for QPWDLVL 2-4 the password hash format differs from what existing cracking tools expect, enabling better understanding of IBM i password security.