Protect your sensitive data with this free open-source disk encryption software. Creates a virtual encrypted disk within a file and mount it as a real disk. Encrypt an entire hard disk partition or a device, such as USB flash drive. Automatically and transparently encrypt in real time.
TrueCrypt provides two levels of plausible deniability, in case an adversary forces you to reveal the password: a hidden volume (steganography- more information may be found here); no TrueCrypt volume can be identified (volumes cannot be distinguished from random data). TrueCrypt uses encryption algorithms AES-256, Blowfish (448-bit key), CAST5, Serpent, Triple DES, and Twofish. It is based on Encryption for the Masses (E4M) 2.02a, conceived in 1997.
TrueCrypt是一套免費的磁碟加密工具，由於他可以不用安裝也可直接使用，所以用在USB隨身碟上特別的方便。他的運作方式簡單的說，就是先在 USB隨身碟中新增一個類似「映像檔」的檔案（加密區），先在隨身碟中指定一個特定大小的空間，這個空間透過TrueCrypt軟體中的幾種特殊加密方式 加密保護，對於一般使用者來說幾乎很難破解。下載地址(download link):
http://download.cnet.com/3001-2092_4-10527243.html?spi=5e8e80f365e53469adb6593191a52b9f
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