ProxyCrypt

ProxyCrypt is a powerful command line tool that creates encrypted volumes within your files or hard drives. It is designed for paranoids and advanced users who want to protect their sensitive data from prying eyes. With ProxyCrypt, encryption and decryption are made on the fly, allowing you to use encrypted volumes like normal ones.

This software is extremely lightweight, open source, and easy to recompile. The 'proxy' feature for the ImDisk Virtual Disk Driver makes it function seamlessly. Plus, you can use ProxyCrypt without argument to get syntax help.

If you need to create encrypted spaces that can be partitioned like an ordinary hard drive, ProxyCrypt is compatible with Arsenal Image Mounter. Features include support for AES-256, Serpent and SHACAL-2 ciphers, encryption cascade, key files or password options, and mode of operation XTS. Passwords are hashed with the scrypt key derivation function, which uses Whirlpool or Keccak hashing function. Scrypt can also be tuned for more security or speed. Additionally, password length can be up to 250 characters, protecting against keyloggers.

ProxyCrypt supports image files or physical drives with MBR (with extended partition) or GPT. Encrypted volumes can be created at any location, not necessarily at the beginning of a file or a partition. Auto-dismount after a specified period of inactivity or when the system enters a suspended state. NTFS folders can be used as mount points instead of drive letters, and very long paths of image files (more than 260 characters) are also supported.

Performance is significantly improved with AES instructions, SSE2 optimizations, and asynchronous read/write. Lastly, ProxyCrypt comes in 32 and 64-bit with distinct AVX versions. Overall, if you're looking for a highly secure and versatile encryption solution, ProxyCrypt is the way to go.