Cryptoloop

In this article, we will explore the fascinating world of Cryptoloop, a topic that has captured the attention of individuals of all ages and backgrounds. From its impact on modern society to its historical relevance, Cryptoloop has been the subject of interest and debate in various spheres. Through this exhaustive analysis, we will take a look at the many facets that make Cryptoloop a topic of great importance in the current context. We will address its origins, evolution and possible future developments, in order to provide a comprehensive and enriching vision of Cryptoloop. Join us on this journey through a topic that never ceases to surprise and captivate!

Cryptoloop is a Linux kernel's disk encryption module that relies on the Crypto API, which is a cryptography framework introduced in version 2.5.45 of the Linux kernel mainline.[1] Cryptoloop was first introduced in the 2.5.x kernel series; its functionality was later incorporated into the device mapper, a generic framework used to map one block device onto another.

Cryptoloop can create an encrypted file system within a partition or from within a regular file in the regular file system. Once a file is encrypted, it can be moved to another storage device. This is accomplished by making use of a loop device, a pseudo device that enables a normal file to be mounted as if it were a physical device. By encrypting I/O to the loop device, any data being accessed must first be decrypted before passing through the regular file system; conversely, any data being stored will be encrypted.

Cryptoloop is vulnerable to watermarking attacks,[2] making it possible to determine presence of watermarked data on the encrypted filesystem:

This attack exploits weakness in IV computation and knowledge of how file systems place files on disk. This attack works with file systems that have soft block size of 1024 or greater. At least ext2, ext3, reiserfs and minix have such property. This attack makes it possible to detect presence of specially crafted watermarked files. Watermarked files contain special bit patterns that can be detected without decryption.[3]

Newer versions of cryptoloop's successor, dm-crypt, are less vulnerable to this type of attack if used correctly.[4]

See also

References

  1. ^ "Kernel development". LWN.net. October 2002. Retrieved 2015-02-15.
  2. ^ SecuriTeam (2005-05-26). "Linux Cryptoloop Watermark Exploit". Retrieved 2006-08-09.
  3. ^ Saarinen, Markku-Juhani O. (2004-02-19). "'Re: Oopsing cryptoapi (or loop device?) on 2.6.*' - MARC". Retrieved 2017-06-04.
  4. ^ Markus Reichelt (2004-06-20). "Why Mainline Cryptoloop Should Not Be Used". Retrieved 2017-06-04.


Stub icon

This cryptography-related article is a stub. You can help Wikipedia by expanding it.

Wikious
Boobota
Sagapedia