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Author Topic: fSekrit not working on an old XP PC  (Read 4827 times)

MerleOne

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fSekrit not working on an old XP PC
« on: October 01, 2012, 03:47:08 AM »
Hi,

A friend of mine says fSekrit.exe v1.40 won't launch on his XP PC.  I'll try to get a capture of the error message and will report here, but is there any known issue on some old XP PC ? I personally never encountered such a behavior.

Thanks.
.merle1.

c.gingerich

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Re: fSekrit not working on an old XP PC
« Reply #1 on: October 01, 2012, 10:48:14 AM »
I have an app that is similar if you want to check it out. It's called Self Note and it supports tabs to allow multi notes. It is free also.

http://starpunch.net/?page=12
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MerleOne

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Re: fSekrit not working on an old XP PC
« Reply #2 on: October 01, 2012, 01:59:26 PM »
I have an app that is similar if you want to check it out. It's called Self Note and it supports tabs to allow multi notes. It is free also.

http://starpunch.net/?page=12

Thanks, will try it.  But I'd still like to know why/if fSekrit has an issue on this old PC.
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Stoic Joker

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Re: fSekrit not working on an old XP PC
« Reply #3 on: October 01, 2012, 02:56:20 PM »
FSekrit should run just fine on anything from Win2000 up.

f0dder

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Re: fSekrit not working on an old XP PC
« Reply #4 on: October 01, 2012, 04:42:08 PM »
FSekrit should run just fine on anything from Win2000 up.
Actually from Win9x and up - I had to go through a few pains to make that work (and then there were a couple of versions where I accidentally botched the win9x support :$).

So, no, there should be nothing preventing fSekrit working on XP. In fact, I've just tested 1.40 on XP-SP3 (under vmware), and it runs just fine. fSekrit also doesn't use any of the fancy instruction sets, so in theory you should be able to run it on... dunno, probably even a 386 :)

Please do try getting a capture of the error message. Perhaps antivirus? Some of those products don't like fSekrit, either because it's compressed with PECompact, or because of heuristics (copying itself to %TEMP% and launching from there, writing to it's own executable).

c.gingerich, from your site: "256 bit RSA_AES encryption with password". That seems like a weird encryption scheme to choose for an application like this?
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c.gingerich

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Re: fSekrit not working on an old XP PC
« Reply #5 on: October 01, 2012, 07:30:43 PM »
F0dder: I'm not good at writing encryption. There was a post on a forum I go to so I decided to use that as it was the only good one I could find that I did not need an external library for.
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MerleOne

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Re: fSekrit not working on an old XP PC
« Reply #6 on: October 02, 2012, 01:05:54 AM »
FSekrit should run just fine on anything from Win2000 up.
Actually from Win9x and up - I had to go through a few pains to make that work (and then there were a couple of versions where I accidentally botched the win9x support :$).

So, no, there should be nothing preventing fSekrit working on XP. In fact, I've just tested 1.40 on XP-SP3 (under vmware), and it runs just fine. fSekrit also doesn't use any of the fancy instruction sets, so in theory you should be able to run it on... dunno, probably even a 386 :)


Please do try getting a capture of the error message. Perhaps antivirus? Some of those products don't like fSekrit, either because it's compressed with PECompact, or because of heuristics (copying itself to %TEMP% and launching from there, writing to it's own executable).

c.gingerich, from your site: "256 bit RSA_AES encryption with password". That seems like a weird encryption scheme to choose for an application like this?

Thanks, I'll look into it .
.merle1.

f0dder

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Re: fSekrit not working on an old XP PC
« Reply #7 on: October 02, 2012, 06:38:48 AM »
F0dder: I'm not good at writing encryption. There was a post on a forum I go to so I decided to use that as it was the only good one I could find that I did not need an external library for.
:) - I just have a somewhat hard time seeing how RSA fits in. Your notes are also self-contained and portable, right? Which means you're storing both RSA public+private keys as well as AES symmetric key in the note? Even if the RSA keys are encrypted, I'm not sure it's a good idea publishing the private part (even if that might be more of a theoretical than practical consideration).

I assume you use the user passphrase to generate an AES-256 key to en/decrypt the RSA key, then use the RSA key to en/decrypt a randomly generated AES-256 key, which is then used for the bulk text en/decryption?

PS: Self Note really doesn't like being UPX-decompressed :-)
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c.gingerich

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Re: fSekrit not working on an old XP PC
« Reply #8 on: October 02, 2012, 08:37:26 AM »
True. I'll have to look to see if I can find another way.

Nope, it breaks if it is decompressed... trying to hack Self Note, eh?  :P
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f0dder

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Re: fSekrit not working on an old XP PC
« Reply #9 on: October 02, 2012, 01:57:57 PM »
Nope, it breaks if it is decompressed... trying to hack Self Note, eh?  :P
Just poking around, as usual :)
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MerleOne

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Re: fSekrit not working on an old XP PC
« Reply #10 on: October 03, 2012, 09:35:47 AM »
Hi all,

I am happy to report that the issue is solved.  Actually, it was a MS Word error.  I had sent the file as a .doc file, to have the webmail accept it.  The receiver had to rename the attached .doc into a .exe to be able to read the message.  But on his PC, extensions of known types were hidden (default XP setting), so when the file (foo.doc) was renamed into a .exe, it was actually renamed into foo.exe.doc. Hence the error message.

The setting has been changed on this PC, and now it works fine.
.merle1.

f0dder

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Re: fSekrit not working on an old XP PC
« Reply #11 on: October 03, 2012, 10:10:46 AM »
Nice to hear :)

Would probably have been better to .zip up the file? Unless, of course, the webmail either disallows .zip or checks contents for executables as well (*sigh*).
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MerleOne

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Re: fSekrit not working on an old XP PC
« Reply #12 on: October 04, 2012, 07:52:35 AM »
Nice to hear :)

Would probably have been better to .zip up the file? Unless, of course, the webmail either disallows .zip or checks contents for executables as well (*sigh*).


Yes, I think it does check .zip for executable files and blocks the mail if one is found.  I could encrypt the zip, in that case I just get a warning, but it's faster to rename as a .doc file.
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x16wda

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Re: fSekrit not working on an old XP PC
« Reply #13 on: October 04, 2012, 06:57:52 PM »
Now, everyone silently send up an appropriate word of thanks to Mr. Gates for his decision to hide file extensions by default.
vi vi vi - editor of the beast

f0dder

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Re: fSekrit not working on an old XP PC
« Reply #14 on: October 05, 2012, 12:40:42 AM »
Now, everyone silently send up an appropriate word of thanks to Mr. Gates for his decision to hide file extensions by default.
Dunno if that was Bill's decision, but it's definitely one of the less wise things Microsoft have done. One could argue that we shouldn't use file extensions instead, but rely on file metadata instead, but I'm not convinced about that - extensions survive across different filesystems and transport protocols, are fast to deal with, and are conceptually simple :)
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