免費開源的加密軟件：TrueCrypt
這款實用的工具軟件非常流行，它已經被下載了將近3000萬次。它可以加密單個文件或整個磁盤或磁盤分區。TrueCrypt是一款免費，開源的支持Windows Vista/XP/2000 and Linux的綠色虛擬加密磁盤工具，可以在硬盤上創建一個或多個虛擬磁盤，所有虛擬磁盤上的文件都被自動加密，需要通過密碼來進行訪問。 TrueCrypt提供多種加密算法，如AES-256、Blowfish(448-bitkey)、CAST5、Serpent、Triple DES等，其他特性還包括支持FAT32和NTFS分區、隱藏卷標和熱鍵啟動。
Main features:
- Creates a virtual encrypted disk within a file and mounts it as a real disk.
- Encrypts an entire partition or storage device such as USB flash drive or hard drive.
- Encrypts a partition or drive where Windows is installed (pre-boot authentication).
- Encryption is automatic, real-time (on-the-fly) and transparent.
- Parallelization and pipelining allow data to be read and written as fast as if the drive was not encrypted.
- Encryption can be hardware-accelerated on modern processors.
- Provides plausible deniability, in case an adversary forces you to reveal the password:
Hidden volume (steganography) and hidden operating system.
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