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Groups > linux.debian.user > #224068
| From | David Christensen <dpchrist@holgerdanske.com> |
|---|---|
| Newsgroups | linux.debian.user |
| Subject | Re: How long will this take? |
| Date | 2020-06-27 00:10 +0200 |
| Message-ID | <Am4HM-2Yc-5@gated-at.bofh.it> (permalink) |
| References | (5 earlier) <AgH97-2N6-3@gated-at.bofh.it> <AgQvL-dQ-5@gated-at.bofh.it> <AjeNk-5w4-3@gated-at.bofh.it> <Ajxdg-7ZC-5@gated-at.bofh.it> <AlWhc-6iS-7@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On 2020-06-26 06:07, David Wright wrote: > On Fri 19 Jun 2020 at 14:52:11 (-0700), David Christensen wrote: >> Benchmark is one thing. But, from a security viewpoint, writing zeros >> to an encrypted volume amounts to providing blocks of plaintext for >> corresponding blocks of cyphertext, thereby facilitating >> cryptanalysis. > > So in view of the unlikelihood of badblocks actually logging something > more useful than SMART (where available) or normal disk write errors, > perhaps a compromise (for my use case) is to just write /dev/urandom > rather than /dev/zero. Copying random data to a partition while creating an encrypted filesystem provides a high-entropy backdrop to conceal ciphertext blocks. This is a form of steganography. The Debian Installer manual partitioning page has an option to do this. As the storage is used, the initial random blocks will be overwritten by ciphertext blocks. Depending upon filesystem, encryption, volume management, and/or device details, the steganography degrades and may eventually disappear. Copying random data to storage will add fresh nearly-random blocks on the device, improving the steganography. (The canonical example is to copy /dev/urandom to a file until the filesystem fills up, and then delete the file. But, this takes time and adds wear to the device.) > On this slow machine with an oldish PATA disk, > I can get about 75% speed from urandom, 15MB/s vs 20MB/s on a 29GiB > partition (no encryption). There's a noticeable slowdown because, > I presume, the machine runs a bit short of entropy after a while. I think you are noticing a slowdown when the Linux write buffer fills. David
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How long will this take? Matthew Campbell <trenix25@pm.me> - 2020-06-08 22:30 +0200
Re: How long will this take? Dan Ritter <dsr@randomstring.org> - 2020-06-08 22:40 +0200
Re: How long will this take? deloptes <deloptes@gmail.com> - 2020-06-08 23:00 +0200
Re: How long will this take? Dan Ritter <dsr@randomstring.org> - 2020-06-09 00:10 +0200
Re: How long will this take? Michael Stone <mstone@debian.org> - 2020-06-10 16:10 +0200
Re: How long will this take? Michael Stone <mstone@debian.org> - 2020-06-10 17:00 +0200
Re: How long will this take? Andrei POPESCU <andreimpopescu@gmail.com> - 2020-06-10 17:00 +0200
Re: How long will this take? David Christensen <dpchrist@holgerdanske.com> - 2020-06-11 02:40 +0200
Re: How long will this take? Jude DaShiell <jdashiel@panix.com> - 2020-06-09 02:20 +0200
Re: How long will this take? Andrei POPESCU <andreimpopescu@gmail.com> - 2020-06-09 09:40 +0200
Re: How long will this take? Nicolas George <george@nsup.org> - 2020-06-08 22:40 +0200
Re: How long will this take? Matthew Campbell <trenix25@pm.me> - 2020-06-08 23:10 +0200
Re: How long will this take? Nicolas George <george@nsup.org> - 2020-06-08 23:20 +0200
Re: How long will this take? David Wright <deblis@lionunicorn.co.uk> - 2020-06-09 05:10 +0200
Re: How long will this take? Christopher David Howie <me@chrishowie.com> - 2020-06-09 06:00 +0200
Re: How long will this take? Nicolas George <george@nsup.org> - 2020-06-09 11:50 +0200
Fw: How long will this take? Matthew Campbell <trenix25@pm.me> - 2020-06-09 17:40 +0200
Re: How long will this take? Christopher David Howie <me@chrishowie.com> - 2020-06-10 02:50 +0200
Re: How long will this take? Michael Stone <mstone@debian.org> - 2020-06-10 16:20 +0200
Re: How long will this take? David Wright <deblis@lionunicorn.co.uk> - 2020-06-10 19:10 +0200
Fw: How long will this take? Matthew Campbell <trenix25@pm.me> - 2020-06-10 19:20 +0200
Re: Fw: How long will this take? David Christensen <dpchrist@holgerdanske.com> - 2020-06-11 03:10 +0200
Fw: Fw: How long will this take? Matthew Campbell <trenix25@pm.me> - 2020-06-11 20:00 +0200
Re: Fw: Fw: How long will this take? Dan Ritter <dsr@randomstring.org> - 2020-06-11 20:10 +0200
Re: Fw: Fw: How long will this take? Kenneth Parker <sea7kenp@gmail.com> - 2020-06-11 22:20 +0200
Re: Fw: Fw: How long will this take? "Rick Thomas" <rick.thomas@pobox.com> - 2020-06-13 11:20 +0200
Re: How long will this take? Michael Stone <mstone@debian.org> - 2020-06-10 21:00 +0200
[OT] How to help the OP? (was: How long will this take?) l0f4r0@tuta.io - 2020-06-10 21:30 +0200
Re: [OT] How to help the OP? (was: How long will this take?) Nicolas George <george@nsup.org> - 2020-06-10 21:30 +0200
Re: [OT] How to help the OP? (was: How long will this take?) Nicolas George <george@nsup.org> - 2020-06-10 22:00 +0200
Re: [OT] How to help the OP? (was: How long will this take?) Michael Stone <mstone@debian.org> - 2020-06-10 22:00 +0200
Re: [OT] How to help the OP? (was: How long will this take?) Nicolas George <george@nsup.org> - 2020-06-10 22:30 +0200
Re: [OT] How to help the OP? (was: How long will this take?) deloptes <deloptes@gmail.com> - 2020-06-11 07:30 +0200
Re: [OT] How to help the OP? (was: How long will this take?) <tomas@tuxteam.de> - 2020-06-11 07:50 +0200
Re: [OT] How to help the OP? (was: How long will this take?) deloptes <deloptes@gmail.com> - 2020-06-11 11:00 +0200
Re: [OT] How to help the OP? (was: How long will this take?) <tomas@tuxteam.de> - 2020-06-11 11:40 +0200
Re: [OT] How to help the OP? (was: How long will this take?) Michael Stone <mstone@debian.org> - 2020-06-11 14:00 +0200
Re: [OT] How to help the OP? (was: How long will this take?) Nicolas George <george@nsup.org> - 2020-06-11 14:10 +0200
Re: [OT] How to help the OP? (was: How long will this take?) Michael Stone <mstone@debian.org> - 2020-06-10 22:00 +0200
Re: [OT] How to help the OP? (was: How long will this take?) Michael Stone <mstone@debian.org> - 2020-06-10 21:50 +0200
Re: [OT] How to help the OP? (was: How long will this take?) David Wright <deblis@lionunicorn.co.uk> - 2020-06-12 04:00 +0200
Re: How long will this take? David Wright <deblis@lionunicorn.co.uk> - 2020-06-12 04:00 +0200
Re: How long will this take? Michael Stone <mstone@debian.org> - 2020-06-12 14:00 +0200
Re: How long will this take? David Wright <deblis@lionunicorn.co.uk> - 2020-06-19 04:20 +0200
Re: How long will this take? David Christensen <dpchrist@holgerdanske.com> - 2020-06-20 00:00 +0200
Re: How long will this take? David Wright <deblis@lionunicorn.co.uk> - 2020-06-26 15:10 +0200
Re: How long will this take? David Christensen <dpchrist@holgerdanske.com> - 2020-06-27 00:10 +0200
Re: How long will this take? David Wright <deblis@lionunicorn.co.uk> - 2020-06-27 03:30 +0200
Re: How long will this take? David Christensen <dpchrist@holgerdanske.com> - 2020-06-27 05:00 +0200
Re: How long will this take? David Wright <deblis@lionunicorn.co.uk> - 2020-07-02 03:10 +0200
Re: How long will this take? David Christensen <dpchrist@holgerdanske.com> - 2020-06-09 09:10 +0200
Re: How long will this take? l0f4r0@tuta.io - 2020-06-09 20:10 +0200
Re: How long will this take? Nicolas George <george@nsup.org> - 2020-06-09 20:30 +0200
Re: How long will this take? Jude DaShiell <jdashiel@panix.com> - 2020-06-09 21:50 +0200
Re: How long will this take? Nicolas George <george@nsup.org> - 2020-06-09 21:50 +0200
Re: How long will this take? Anders Andersson <pipatron@gmail.com> - 2020-06-10 12:50 +0200
Re: How long will this take? Nicolas George <george@nsup.org> - 2020-06-10 13:20 +0200
Re: How long will this take? Anders Andersson <pipatron@gmail.com> - 2020-06-10 15:30 +0200
Re: How long will this take? Nicolas George <george@nsup.org> - 2020-06-10 15:40 +0200
Re: How long will this take? Anders Andersson <pipatron@gmail.com> - 2020-06-10 16:00 +0200
Re: How long will this take? Nicolas George <george@nsup.org> - 2020-06-10 16:10 +0200
Re: How long will this take? Anders Andersson <pipatron@gmail.com> - 2020-06-10 22:10 +0200
Fw: How long will this take? Matthew Campbell <trenix25@pm.me> - 2020-06-10 19:00 +0200
Re: How long will this take? Jude DaShiell <jdashiel@panix.com> - 2020-06-09 20:30 +0200
Re: How long will this take? Seeds Notoneofmy <notoneofmyseeds@gmx.de> - 2020-06-27 01:40 +0200
Re: How long will this take? rhkramer@gmail.com - 2020-06-27 03:30 +0200
Re: How long will this take? Seeds Notoneofmy <notoneofmyseeds@gmx.de> - 2020-06-27 03:50 +0200
Re: How long will this take? rhkramer@gmail.com - 2020-06-27 20:10 +0200
Re: How long will this take? Andrei POPESCU <andreimpopescu@gmail.com> - 2020-06-27 10:40 +0200
On Subject drift [was: How long will this take?] <tomas@tuxteam.de> - 2020-06-27 11:00 +0200
Re: On Subject drift [was: How long will this take?] l0f4r0@tuta.io - 2020-06-27 11:40 +0200
Re: On Subject drift [was: How long will this take?] Seeds Notoneofmy <notoneofmyseeds@gmx.de> - 2020-06-27 16:40 +0200
Re: On Subject drift [was: How long will this take?] <tomas@tuxteam.de> - 2020-06-27 18:50 +0200
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