Note: This page is horribly out of
date.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...
To understand the search term, you first have to understand the app. QuickPic was once the gold standard for Android gallery apps.
The Reality: Today, the original QuickPic development is effectively dead. The "Pro" versions found on third-party APK sites are usually modified versions (mods) of the last stable release before the app became ad-heavy.
The "Extra Quality" mod restores the original folder hiding mechanism (using .nomedia files) and allows you to exclude WhatsApp/WeChat images without deleting them.
The QuickPic Gallery Pro APK Extra Quality mod is a beautiful relic—a testament to how good Android apps used to be before SaaS and cloud subscriptions took over. It offers image rendering quality that, ironically, still beats many 2024 gallery apps.
But it is a security gamble. If you treat it as a "dumb viewer" for your movies and memes on a secondary phone, it’s fantastic. For your primary daily driver with private photos? It is time to let go and move to Simple Gallery Pro (open source) or Aves Gallery —they offer 90% of QuickPic’s speed with 100% of modern security.
Have you used the Extra Quality mod? Tell us your experience in the comments below (and share your VirusTotal scan results while you're at it).
Disclaimer: This article does not host or provide direct links to APK files. Always respect software licensing and developer rights.
I notice you're asking about a "QuickPic Gallery Pro APK" with terms like "extra quality" and "good paper," which seems like a mix of app-related and oddly formatted keywords.
To clarify:
If you're looking for a safe, high-quality gallery app for Android today, I'd recommend:
If you were actually looking for academic writing help (since "good paper" suggests an essay or research paper), please clarify, and I'll be glad to assist with that instead.
Let me know what you truly need, and I'll give you a proper, helpful answer.
Here’s a write-up for QuickPic Gallery Pro (Extra Quality) — tailored for a tech blog, app archive, or discussion forum. It focuses on features, performance, and the “extra quality” angle (e.g., higher-resolution caching, improved image rendering, or modded enhancements).
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.
To understand the search term, you first have to understand the app. QuickPic was once the gold standard for Android gallery apps.
The Reality: Today, the original QuickPic development is effectively dead. The "Pro" versions found on third-party APK sites are usually modified versions (mods) of the last stable release before the app became ad-heavy.
The "Extra Quality" mod restores the original folder hiding mechanism (using .nomedia files) and allows you to exclude WhatsApp/WeChat images without deleting them.
The QuickPic Gallery Pro APK Extra Quality mod is a beautiful relic—a testament to how good Android apps used to be before SaaS and cloud subscriptions took over. It offers image rendering quality that, ironically, still beats many 2024 gallery apps. quickpic gallery pro apk extra quality
But it is a security gamble. If you treat it as a "dumb viewer" for your movies and memes on a secondary phone, it’s fantastic. For your primary daily driver with private photos? It is time to let go and move to Simple Gallery Pro (open source) or Aves Gallery —they offer 90% of QuickPic’s speed with 100% of modern security.
Have you used the Extra Quality mod? Tell us your experience in the comments below (and share your VirusTotal scan results while you're at it).
Disclaimer: This article does not host or provide direct links to APK files. Always respect software licensing and developer rights. To understand the search term, you first have
I notice you're asking about a "QuickPic Gallery Pro APK" with terms like "extra quality" and "good paper," which seems like a mix of app-related and oddly formatted keywords.
To clarify:
If you're looking for a safe, high-quality gallery app for Android today, I'd recommend: The Reality: Today, the original QuickPic development is
If you were actually looking for academic writing help (since "good paper" suggests an essay or research paper), please clarify, and I'll be glad to assist with that instead.
Let me know what you truly need, and I'll give you a proper, helpful answer.
Here’s a write-up for QuickPic Gallery Pro (Extra Quality) — tailored for a tech blog, app archive, or discussion forum. It focuses on features, performance, and the “extra quality” angle (e.g., higher-resolution caching, improved image rendering, or modded enhancements).
Please contact the mailing list: dm-crypt@saout.de. Or in case there is a problem with the mailing list, me: .