Hello Is there any place where i can get good online information about how B+ Trees are implemented ? And i want to design a file system with transparent encryption, what would be the best password policy ( like - password for every file , password for a directory, expiration of a password after some time,password only when mounting... ) I am reading the "Dinosaur book" and it mentions the above policies... What else could be required ? regards Sridhar -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/