File Encryption and Decryption in UNIX.

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# 1  
Old 08-27-2002
File Encryption and Decryption in UNIX.

Hello guys !

I have used "crypt <first> second" command to encrypt "first" to "second" file. i have assign a key for that of course.

Now when i try to look content of "seocnd" file through "cat second" command, the file is encrypted and cannot be read which is according to plan.

But when i decrypt the same file ("crypt <first> second") and gave the same key and try to see contents of file "second", it is still encrypted why ?

after decryption, you should not be able to see the contents of file in plain text ?

Please help me in this regad.

Thanks and Regards
Abid Malik
# 2  
Old 08-27-2002
To decrypt, the input must the encrypted file. You are just running the encyption step twice.

crypt < plain > encrypted ## encrypt file
crypt < encrypted ## view the file
# 3  
Old 08-27-2002
look at your syntax...

Oops! I guess Perderabo was editing when I was!!

Anyway, you have a few issues here.

First, you can't use cat. If you want to view an encrypted file, you must use the [B]vi -x <filename> command. Usually the crypted file ends in *.x]/B]

Next, when you decrypt the file, you are extracting the file from the encrypted file. I believe that you must give a filename for it to extract to.

It appears that you didn't reverse the order of first second to second first when you were decrypting.

to encrypt:
crypt <file1 >file2.x

to decrypt:
crypt <file2.x >file1

Of course, you will have to cleanup any unencrypted files that you create or clear the screen to erase what went to std out.

This should fix your problem.
# 4  
Old 08-27-2002
Hammer & Screwdriver

Hello there !

First of let me Thank "Kelam_magnus" and "Perderabo" for solving my problem and helping to understand that encryption issue.

I got it very well. You both are right. i tried both ways and it did work fine.

this is what i did.

----------------- for encryption of "first" to "second"------------

$> crypt <first> second
$> enter Key: test
----------------- for decryption----------------------------
$> crypt < second
$> enter Key: test

and it shows me the content of file.

then i tried in vi.. Kelam_magnus is right about -x option of vi. it uses for cryption and decryption.

vi -x second
enter key: test

and here is contents of file.

one thing i notice that the encryption file donot have to be end with .x or anything. i am not positive but it worked fine without it.

Thanks again and see you in my next question.

Abid Malik
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