LX0-104 · 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, ESSIV, and LRW are valid operating modes or components used with dm-crypt for disk encryption, providing different methods for handling encryption and initialization vectors.
Question
Options
- AXTS
- BESSIV
- CGMR
- DKWG
- ELRW
How the community answered
(31 responses)- A87% (27)
- C3% (1)
- D10% (3)
Why each option
XTS, ESSIV, and LRW are valid operating modes or components used with dm-crypt for disk encryption, providing different methods for handling encryption and initialization vectors.
XTS (XEX-based tweaked-codebook mode with ciphertext stealing) is a common and robust block cipher mode of operation used for disk encryption with dm-crypt.
ESSIV (Encrypted Salt-Sector Initialization Vector) is a method for generating initialization vectors for block ciphers like CBC, often used with dm-crypt to enhance security against watermarking attacks.
GMR is not a standard dmcrypt mode.
KWG is not a standard dmcrypt mode.
LRW (Luby-Rackoff-Wagner mode) is another disk encryption mode, although less common than XTS in modern dm-crypt configurations.
Concept tested: dm-crypt encryption modes
Source: https://gitlab.com/cryptsetup/cryptsetup/wikis/DMCrypt
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