Note: This page is horribly out of
date.
You can find the current pages for the dm-crypt
project (the Linux kernel part) here:
https://gitlab.com/cryptsetup/cryptsetup/wikis/DMCrypt
and the project page for the command line tool
cryptsetup (with Linux Unified Key
Setup - LUKS) here: https://gitlab.com/cryptsetup/cryptsetup.
Old page:
Device-mapper is a new infrastructure in the Linux 2.6 kernel that provides
a generic way to create virtual layers of block devices that can do different
things on top of real block devices like striping, concatenation, mirroring,
snapshotting, etc... The device-mapper is used by the
LVM2 and
EVMS 2.x tools.
dm-crypt is such a device-mapper target that provides transparent encryption of
block devices using the new Linux 2.6 cryptoapi. The user can basically specify
one of the symmetric ciphers, a key (of any allowed size), an iv generation mode
and then the user can create a new block device in /dev. Writes to this device
will be encrypted and reads decrypted. You can mount your filesystem on it as usual.
But without the key you can't access your data.
It does basically the same as cryptoloop only that it's a much cleaner code and
better suits the need of a block device and has a more flexible configuration
interface. The on-disk format is also compatible. In the future you will be able
to specify other iv generation modes for enhanced security (you'll have to
reencrypt your filesystem though).
I've set up a Wiki.
There's a mailing list at .
If you want to subscribe, use the mailman
web interface or its
archive.
Gmane provides a NNTP interface and also a
web archive
for this mailing list.
There is support for dm-crypt in the latest official kernel
2.6.4
which you can find on kernel.org.
Please use the mirrors for downloads.
There is a HIGHMEM cryptoapi bug in kernels before 2.6.4-rc2, please
upgrade if you were using such a kernel.
The latest version of the native userspace setup tool is cryptsetup 0.1.
Clemens Fruhwirth is maintaining an
enhanced
version of cryptsetup with the LUKS extension that allows you to have an
on-disk block of metadata which is superior to the current mechanism and was
my long term plan anyway but I didn't find the time to implement that yet...
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The on-disk layouts used by the current 2.6 cryptoloop are supported by dm-crypt.
Cryptoloop also uses cryptoapi so the name of the ciphers are the same. Cryptoloop also
supports ECB and CBC mode. Use <cipher>-ecb and
<cipher>-plain accordingly with dm-crypt. If you didn't
explicitly specify either -ecb or -cbc before you don't need it now, the default plain
IV generation will be used. There will be additional (incompatible, but more secure) possibilites
in the future because the unhashed sector number as IV is too predictible.
You'll need to figure out how your passphrase was turned into a key to use for losetup.
There are several patches floating around doing things differently. But usually cryptsetup
will provide a working solution to recreate the same key from your passphrase.
If you want to migrate from 2.4 cryptoloop please take a look at Clemens Fruhwirth's
Cryptoloop
Migration Guide. He describes the differences between 2.4 and 2.6 cryptoapi (or basically
the bugs in 2.4 cryptoapi...). If you need to cut the key size you can use the -s
option instead of playing with dd.
(BTW: Clemens has a i586 optimized version of the aes and serpent cipher on his page,
about twice as fast as the kernel implementation.)
Why dm-crypt?
Originally it started as a fun project because I wanted to play with the new Linux 2.6 internals.
I got a lot of great help from the device-mapper guys at Sistina (now Redhat). Thank you very
much!
It turned out that this implementation worked great and is very clean compared to the hacked
loop device. The device-mapper core provides much better facilities to stack block devices.
dm-crypt uses mempools to assure we never run into out-of-memory deadlocks when allocating
buffers.
Also the device-mapper configuration interface provides much more flexibility than the losetup
ioctl. And you can create as many devices as you want with any names you want and combine them
with other dm targets. Online device resizing is also possible, e.g. if you use dm-crypt on top
of a logical volume. There might perhaps even be LVM or EVMS support for device encryption
in the future.
The industry has moved away from the "binge-drop" model toward weekly releases for prestige dramas. By June 1, 2024, "Appointment Viewing" has returned. This shift encourages community building, as fans spend the week between episodes discussing theories on Reddit and creating "reaction" content, effectively extending the lifecycle of a single season. Conclusion
On June 1, we saw a surge in where 60-second clips of major series became the primary way audiences discovered new shows. This "hook-first" content strategy ensures that media is optimized for short attention spans, forcing studios to prioritize high-impact visuals and immediate emotional beats. 2. Genre Resurgence: Intellectual Property (IP) and Beyond
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In the fast-moving world of digital culture, specific dates often serve as benchmarks for major shifts in how we consume stories. June 1, 2024 (24-06-01), stands as a pivotal moment in the year's entertainment calendar, marking the transition into the "summer blockbuster" season and a significant evolution in cross-platform media integration.
Artificial Intelligence is no longer a futuristic concept in media; by June 2024, it is a daily tool. From AI-driven recommendation algorithms that curate our "For You" pages to the use of generative AI in post-production and visual effects, the technology is deeply embedded. However, this has also sparked a significant dialogue regarding . Popular media is currently seeing a "human-centric" pushback, where audiences are increasingly craving raw, unpolished, and "real" content to contrast the perfection of AI-generated visuals. 4. Globalism in Popular Media The industry has moved away from the "binge-drop"
The entertainment landscape of June 1, 2024, is defined by its fluidity. Media is no longer something we just watch; it is something we interact with, remix, and share. As we move further into the year, the winners in the media space will be those who can balance high-tech delivery with deeply human storytelling.
The date 24-06-01 also reflects the total globalization of entertainment. Regional content from South Korea, Spain, and Nigeria is no longer "niche." The "global top 10" lists across streaming platforms show a diverse array of languages and cultures, proving that local stories with universal themes are the most powerful currency in modern media. 5. The "Eventization" of TV Conclusion On June 1, we saw a surge
Animation continues to dominate the cultural conversation, appealing to both adults and children with sophisticated themes.
From the rise of "micro-entertainment" on social platforms to the sophisticated delivery of high-budget streaming series, here is an analysis of the content and popular media trends defining this era. 1. The Convergence of Streaming and Social Media
The media landscape on 24-06-01 highlights a heavy reliance on established Intellectual Property, but with a twist. The audience "franchise fatigue" predicted by many critics has been countered by .
Please contact the mailing list: dm-crypt@saout.de. Or in case there is a problem with the mailing list, me: .