loop-AES – file system and swap encryption package

loop-AES is a fast and transparent file system and swap encryption package. loop-AES can be used to encrypt disk partitions, removable media, swap space and other devices. It provides measures to strengthen the encryption including passphrase seeds, multiple hash iterations, MD5 IV and alternating encryption keys.

It provides loadable Linux kernel module (loop.o or loop.ko on 2.6 kernels) that has AES cipher built-in. The AES cipher can be used to encrypt local file systems and disk partitions.

Loop device encrypts data but does not authenticate ciphertext. In other words, it provides data privacy, but does not guarantee that data has not been tampered with. Admins setting up encrypted file systems should ensure that neither ciphertext, nor tools used to access ciphertext (kernel + kernel modules, mount, losetup, and other utilities) can be trojaned or tampered.

loop-AES does not modify the kernel in any way. This means that users can still use kernels which have been patched. The tool worls with works with 2.0.x, 2.2.x, 2.4.x (2.4.7 or later) and 2.6.x kernels.

Features include:

  • Pre-boot authentication.
  • Custom authentication.
  • Multiple keys.
  • Passphrase strengthening.
  • Hardware acceleration.
  • Any filesystem supported by the operating system.
  • Layering:
    • File.
    • Partition.
    • Entire disk.
    • Swap space.
  • AES cipher is used in CBC (cipher block chaining) mode.
  • Includes the cipher modules blowfish, twofish and serpent in addition to the default cipher (AES).
  • Three key setup modes are supported; single-key, multi-key-v2 and multi-key-v3 modes.
  • Encryption keys are kept in kernel RAM while loop is active.
  • File system soft block sizes.
  • Compatibility with other loop encryption implementations.
  • Encryption keys can be stored in a GnuPG-encrypted keyfile, which allows the passphrase to be changed without re-encryption.
  • The key (with all the parameters – key length, algorithm etc) resides on your encryption partition at the first blocks of your hard disk.

Website: sourceforge.net/projects/loop-aes
Developer: Jari Ruusu
License: GNU GPL v2

loop-AES is written in C. Learn C with our recommended free books and free tutorials.

Return to Disk Encryption Home Page

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