免费开源的加密软件：TrueCrypt
这款实用的工具软件非常流行，它已经被下载了将近3000万次。它可以加密单个文件或整个磁盘或磁盘分区。TrueCrypt是一款免费，开源的支持Windows Vista/XP/2000 and Linux的绿色虚拟加密磁盘工具，可以在硬盘上创建一个或多个虚拟磁盘，所有虚拟磁盘上的文件都被自动加密，需要通过密码来进行访问。 TrueCrypt提供多种加密算法，如AES-256、Blowfish(448-bitkey)、CAST5、Serpent、Triple DES等，其他特性还包括支持FAT32和NTFS分区、隐藏卷标和热键启动。
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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