LFCS · Question #357
Which of the following are valid dmcrypt modes? (Choose THREE correct answers)
The correct answer is A. XTS B. ESSIV E. LRW. XTS and LRW are valid block cipher modes for dm-crypt, while ESSIV is a valid method for generating initialization vectors in conjunction with cipher modes like CBC.
Question
Options
- AXTS
- BESSIV
- CGMR
- DKWG
- ELRW
How the community answered
(39 responses)- A90% (35)
- C5% (2)
- D5% (2)
Why each option
XTS and LRW are valid block cipher modes for dm-crypt, while ESSIV is a valid method for generating initialization vectors in conjunction with cipher modes like CBC.
XTS (Xor-Encrypt-Xor with Tweakable Block Cipher) is a widely adopted and robust block cipher mode specifically designed for disk encryption, providing good security and performance.
ESSIV (Encrypted Salt-Sector Initialization Vector) is a method used with block cipher modes like CBC in dm-crypt to generate unique and unguessable Initialization Vectors for each sector, enhancing security against certain types of attacks.
GMR is not a recognized or valid dm-crypt mode.
KWG is not a recognized or valid dm-crypt mode.
LRW (Limited-Range Woven) is an older, but still valid, tweakable block cipher mode designed for disk encryption, offering resistance to certain attacks that standard CBC mode might be vulnerable to.
Concept tested: dm-crypt cipher and IV modes
Source: https://gitlab.com/cryptsetup/cryptsetup/-/wikis/DMCrypt
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