I need a free file encryption software

TrueCrypt is a simple, easy-to-use, on-the-fly encryption program. It works on Windows 2000/XP/2003 and Linux. 
 Some features include: 
 
 Ability to encrypt entire hard disk partition or a storage device 	 Creation of a virtual encrypted disk within a file that mounts as a real disk. 	 Encryption using AES -256, Blowfish (448-bit key), CAST5, Serpeant, Triple DES , and Twofish. 
 
 For a more information, please visit: TrueCrypt 
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 UCLA offers PGP WDE (whole disk encryption) free to all departments. It is cross platform, has central key management (for recovery!), and there are staff to assist implementation: 
 http://itsecurity.ucla.edu/encryption_home.php 
 Crashed PGP encrypted disks can be recovered by DriveSavers : 
 https://kb.ucla.edu/link/364