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where do OS and other programs keep the passwords of users hidden?
Where are passwords hidden
u lost urs or u wanna know others password 
any ways its usually stored in encrypted format...and it also depends program in use for the way the password it stored
any ways its usually stored in encrypted format...and it also depends program in use for the way the password it stored
which OS ??
If u r talking about windows (XP) it is encrypted in SAM file located @ <System root>\WINDOWS\system32\config\SAM
& it is in /etc/passwd in case of Linux
If u r talking about windows (XP) it is encrypted in SAM file located @ <System root>\WINDOWS\system32\config\SAM
& it is in /etc/passwd in case of Linux
Try L0pthcrack for cracking windows passwords
and John the Ripper for Linux !
and John the Ripper for Linux !