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Re: Encrypt files on Linux, decrypt on Windows

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john doe writes:

> On 8/21/2020 9:11 PM, David Christensen wrote:
>> On 2020-08-21 11:24, Linux-Fan wrote:

[...]

>>> Encrypt on Linux:
>>> $ 7z a -ptestwort -mhe=on secret.7z secret.txt
>>>
>>> Decrypt on Windows: Double-Click or use commandline:
>>> % 7z x -o. secret.7z
>>
>>
>> So, the recipient must install 7-Zip on their Windows computer?

In that example: Yes or use a 7z.exe obtained from the website without
installation.

[...]

> To the OP, look at creating a self extracting archive (not sure if it
> works from Linux to Windows though).

It works from Linux to Windows, but it is trickier than I had imagined:

On Linux:

 * Go to https://www.7-zip.org/download.html and download 64-bit x64

 * Extract file 7z1900-x64.exe with 7z.

   $ mkdir sub
   $ 7z x -osub 7z1900-x64.exe

 * Copy 7z.sfx from the extracted installer

   $ cp sub/7z.sfx .

 * Create SFX archive for Windows

   $ 7z a -mhe=on -ptestwort -sfx7z.sfx mysfx.exe secret.txt

 * Send file `mysfx.exe` to the Windows user

On Windows:

 * Run `mysfx.exe` -- it prompts for the password (`testwort`).

I nowdays prefer the portable/installed version over SFX archives because
uncommon executables are often rejected by antivirus software (especially
.exe attachments to e-mails are prone to being deleted for security
reasons...). Although most scanners seem to be fine with a generated SFX
archive at the moment:

https://www.virustotal.com/gui/file/e2dd36862c27e1551916ed3e773a55ecedf2b35e658522fa982369cc90eaf488/detection

[...]

HTH
Linux-Fan

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Encrypt files on Linux, decrypt on Windows local10 <local10@tutanota.com> - 2020-08-21 19:50 +0200
  Re: Encrypt files on Linux, decrypt on Windows john doe <johndoe65534@mail.com> - 2020-08-21 20:20 +0200
  Re: Encrypt files on Linux, decrypt on Windows Linux-Fan <Ma_Sys.ma@web.de> - 2020-08-21 20:30 +0200
    Re: Encrypt files on Linux, decrypt on Windows David Christensen <dpchrist@holgerdanske.com> - 2020-08-21 21:20 +0200
      Re: Encrypt files on Linux, decrypt on Windows john doe <johndoe65534@mail.com> - 2020-08-21 21:20 +0200
        Re: Encrypt files on Linux, decrypt on Windows Linux-Fan <Ma_Sys.ma@web.de> - 2020-08-21 22:00 +0200
    Re: Encrypt files on Linux, decrypt on Windows Teemu Likonen <tlikonen@iki.fi> - 2020-08-21 22:40 +0200
      [OT] Linux-Fan's bad signatures (Re: Encrypt files on Linux,          decrypt on Windows) Linux-Fan <Ma_Sys.ma@web.de> - 2020-08-22 00:20 +0200
        Re: Linux-Fan's bad signatures Teemu Likonen <tlikonen@iki.fi> - 2020-08-22 09:20 +0200
          Re: Linux-Fan's bad signatures Linux-Fan <Ma_Sys.ma@web.de> - 2020-08-22 12:50 +0200
        Signing emails, was Re: General-Purpose Server for Debian Stable David Wright <deblis@lionunicorn.co.uk> - 2020-10-02 05:30 +0200
  Re: Encrypt files on Linux, decrypt on Windows Paul Johnson <baloo@ursamundi.org> - 2020-08-21 20:40 +0200
    Re: Encrypt files on Linux, decrypt on Windows Charles Curley <charlescurley@charlescurley.com> - 2020-08-21 21:10 +0200
      Re: Encrypt files on Linux, decrypt on Windows Marek Mosiewicz <marek.mosiewicz@jotel.com.pl> - 2020-08-23 11:30 +0200
        Re: Encrypt files on Linux, decrypt on Windows <tomas@tuxteam.de> - 2020-08-23 11:40 +0200
      Re: Encrypt files on Linux, decrypt on Windows Andrei POPESCU <andreimpopescu@gmail.com> - 2020-08-23 13:10 +0200
        Re: Encrypt files on Linux, decrypt on Windows Charles Curley <charlescurley@charlescurley.com> - 2020-08-23 16:40 +0200
        Signal [Was:] Re: Encrypt files on Linux, decrypt on Windows Celejar <celejar@gmail.com> - 2020-08-25 20:20 +0200
          Re: Signal [Was:] Re: Encrypt files on Linux, decrypt on Windows Andrei POPESCU <andreimpopescu@gmail.com> - 2020-08-26 08:30 +0200
            Re: Signal [Was:] Re: Encrypt files on Linux, decrypt on Windows Celejar <celejar@gmail.com> - 2020-08-26 14:10 +0200
  Re: Encrypt files on Linux, decrypt on Windows Matthew Graybosch <hello@matthewgraybosch.com> - 2020-08-21 20:50 +0200
    Re: Encrypt files on Linux, decrypt on Windows <tomas@tuxteam.de> - 2020-08-21 22:00 +0200
      Re: Encrypt files on Linux, decrypt on Windows Matthew Graybosch <hello@matthewgraybosch.com> - 2020-08-21 22:20 +0200
        Re: Encrypt files on Linux, decrypt on Windows rhkramer@gmail.com - 2020-08-22 02:20 +0200
          Re: Encrypt files on Linux, decrypt on Windows Matthew Graybosch <hello@matthewgraybosch.com> - 2020-08-22 03:30 +0200
            Re: Encrypt files on Linux, decrypt on Windows <tomas@tuxteam.de> - 2020-08-22 09:40 +0200
              Re: Encrypt files on Linux, decrypt on Windows Matthew Graybosch <hello@matthewgraybosch.com> - 2020-08-23 19:10 +0200
          Re: Encrypt files on Linux, decrypt on Windows Jonathan Dowland <jon+debian-user@dow.land> - 2020-08-26 11:40 +0200
            Re: Encrypt files on Linux, decrypt on Windows Hornet <hornetmadness@gmail.com> - 2020-08-29 15:40 +0200
  Re: Encrypt files on Linux, decrypt on Windows Teemu Likonen <tlikonen@iki.fi> - 2020-08-21 21:10 +0200
    Re: Encrypt files on Linux, decrypt on Windows Teemu Likonen <tlikonen@iki.fi> - 2020-08-21 21:20 +0200
      Re: Encrypt files on Linux, decrypt on Windows David Christensen <dpchrist@holgerdanske.com> - 2020-08-21 21:30 +0200
  Re: Encrypt files on Linux, decrypt on Windows David Christensen <dpchrist@holgerdanske.com> - 2020-08-21 21:20 +0200
  Re: Encrypt files on Linux, decrypt on Windows Hans <hans.ullrich@loop.de> - 2020-08-21 22:30 +0200
    Re: Encrypt files on Linux, decrypt on Windows Hans <hans.ullrich@loop.de> - 2020-08-21 22:40 +0200
  Re: Encrypt files on Linux, decrypt on Windows Andrew McGlashan <andrew.mcglashan@affinityvision.com.au> - 2020-08-22 03:10 +0200
  Re: Encrypt files on Linux, decrypt on Windows deloptes <deloptes@gmail.com> - 2020-08-22 09:50 +0200
  Re: Encrypt files on Linux, decrypt on Windows mick crane <mick.crane@gmail.com> - 2020-08-22 12:20 +0200
    "What's wrong with...?" Teemu Likonen <tlikonen@iki.fi> - 2020-08-22 20:30 +0200
      Re: "What's wrong with...?" Dan Ritter <dsr@randomstring.org> - 2020-08-22 20:40 +0200
      Re: "What's wrong with...?" mick crane <mick.crane@gmail.com> - 2020-08-23 08:50 +0200
        Re: "What's wrong with...?" Jonathan Dowland <jon+debian-user@dow.land> - 2020-08-26 11:30 +0200

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