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Thread: How to fix an asc encrypted file

  1. #1
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    Default How to fix an asc encrypted file

    I have a video file that was zipped and then encrypted using kleopatra with opensuse 11.3 if I recall fine, but now that I want to unencrypt I have an error Decryption failed: No data, is there a way a recover at least a part of the video?

    thanks

  2. #2
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    Default Re: How to fix an asc encrypted file

    On Mon, 13 Oct 2014 20:46:01 +0000, Easgs wrote:

    > is there a way a recover at
    > least a part of the video?


    Not very likely, that would kinda defeat the purpose of encryption....

    Jim



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  3. #3
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    Default Re: How to fix an asc encrypted file

    I have encrypted the video and have the correct password, it is not a password or certify problem, the problem I think is that the file got damage in the cd where it was stored, what I want is to know if there is a way to recover at least a part of the video, I have the correct password because I have encrypted the file so I don't need to bypass the encryption.

  4. #4
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    Default Re: How to fix an asc encrypted file

    Quote Originally Posted by Easgs View Post
    Decryption failed: No data
    That error suggest that perhaps you had the command parameters wrong. At least recheck that.
    openSUSE Leap 15.1; KDE Plasma 5;
    testing Leap 15.2Alpha

  5. #5
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    Default Re: How to fix an asc encrypted file

    On 2014-10-14 00:16, Easgs wrote:
    >
    > I have encrypted the video and have the correct password, it is not a
    > password or certify problem, the problem I think is that the file got
    > damage in the cd where it was stored, what I want is to know if there is
    > a way to recover at least a part of the video, I have the correct
    > password because I have encrypted the file so I don't need to bypass the
    > encryption.


    I think it is impossible.

    But kleopatra uses GPG, so you may google for a dedicated GPG forum and
    search/ask there.



    The safe way to store things for reliable archiving is using forward
    data recovery methodologies. No, I don't know any software in Linux that
    does it, besides parchive; par2 is in the distribution on some home
    repos. And it does not convince me.

    http://software.opensuse.org/package/libpar2
    http://en.wikipedia.org/wiki/Parchive




    Some time ago, I used this, to prepare data recovery blocks for DVDs:

    Code:
    LISTA="*pdf *rar *zip *avi *jpg"
    SILENCE=""
    time nice par2 c -m500 -s1048576 -c225  $SILENCE -l recovery $LISTA
    You have to adjust the parameters and the data files sizes so that it
    all fits into a DVD. If I had to do it today, I'd like to investigate it
    first, again.


    I seem to recall some specific softawre for CD/DVDs, but I forgot the
    name... Maybe it was some other software for Windows that simply
    automated this procedure.

    --
    Cheers / Saludos,

    Carlos E. R.
    (from 13.1 x86_64 "Bottle" at Telcontar)

  6. #6
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    Default Re: How to fix an asc encrypted file

    On Mon, 13 Oct 2014 22:16:01 +0000, Easgs wrote:

    > I have encrypted the video and have the correct password, it is not a
    > password or certify problem, the problem I think is that the file got
    > damage in the cd where it was stored, what I want is to know if there is
    > a way to recover at least a part of the video, I have the correct
    > password because I have encrypted the file so I don't need to bypass the
    > encryption.


    I would redirect you back to my initial response.

    This is one of the things that happens with encryption. Typically (but
    not always), encryption involves the use of a cypher block that uses a
    strong encryption key that's unlocked by a password - the password itself
    isn't used in the encryption.

    If that key block is corrupted, then there's no hope for recovery at all.

    If the key block is not corrupted, but part of the file is, you *may* be
    able to recover part of the file up to the corrupted bit. But the only
    way to do that is with the software used for the encryption. So, if the
    software you used to encrypt the file won't give you a partial file back,
    then the answer is no, there isn't a way to recover even part of the
    file, at least not without hacking at the code for the encryption,
    assuming it's open source to begin with.

    Jim



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    Jim Henderson
    openSUSE Forums Administrator
    Forum Use Terms & Conditions at http://tinyurl.com/openSUSE-T-C

  7. #7
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    Default Re: How to fix an asc encrypted file

    On 2014-10-14 04:17, Jim Henderson wrote:
    > file, at least not without hacking at the code for the encryption,
    > assuming it's open source to begin with.


    Yes, it is:

    Code:
    cer@Telcontar:~> which kleopatra
    /usr/bin/kleopatra
    cer@Telcontar:~> rpm -qf /usr/bin/kleopatra
    kdepim4-4.11.5-468.2.x86_64
    cer@Telcontar:~> rpm -qfi /usr/bin/kleopatra
    Name        : kdepim4
    Version     : 4.11.5
    Release     : 468.2
    Architecture: x86_64
    Install Date: 2014-05-22T04:44:12 CEST
    Group       : System/GUI/KDE
    Size        : 21149327
    License     : GPL-2.0+ and LGPL-2.1+
    Signature   : RSA/SHA256, 2014-05-21T10:30:49 CEST, Key ID b88b2fd43dbdc284
    Source RPM  : kdepim4-4.11.5-468.2.src.rpm
    Build Date  : 2014-05-13T17:38:16 CEST
    Build Host  : build31
    Relocations : (not relocatable)
    Packager    : http://bugs.opensuse.org
    Vendor      : openSUSE
    URL         : http://www.kde.org
    Summary     : Base package of kdepim
    Description :
    This package contains the core files of the kdepim module.
    Distribution: openSUSE 13.1
    cer@Telcontar:~>
    It is just a frontend, to openpgp and cms at least.

    --
    Cheers / Saludos,

    Carlos E. R.
    (from 13.1 x86_64 "Bottle" at Telcontar)

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