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Full Discussion: Encrypt and Decrypt a File with Password
Top Forums UNIX for Beginners Questions & Answers Encrypt and Decrypt a File with Password Post 302992645 by bakunin on Tuesday 28th of February 2017 05:34:27 AM
Old 02-28-2017
Quote:
Originally Posted by eskay
I have few files on unix [...] and I need them to encrypt with password so others wouldn't see the data.
Unix offers a lot of utilities doing exactly that: uuencode, openssl and several others.

The problem you will be facing is not so much the encyption/decryption itself but to make sure nobody can intercept it. Suppose you use a password to encrypt your file you might have a script with the line

Code:
encrypt_utility "password" /path/to/file > path/to/file.encrypted

and then move/send/... the encrypted version of the file. But if someone can read your scvript he could take the password from there and use it himself to decrypt the file.

This means you have to plan carefully so that nobody without the proper rights have even read-access to such a script. As in most security-related problems the solution is very simple once you got the planning of who is allowed to do what under which circumstance correct.

For the tools to use i suggest you read the man-pages/descriptions of the two utilities i mentioned above. They are standard-UNIX tools and freely available open-source respectively. If what they can do suffices for your purpose we can help you put one or the other to work. If not, i suggest doing a Google-search for other such tools. There are reams and reams of software out there, for all kind of purposes. Once you have decided for one or the other we can (hopefully) help you put that o work too.

I hope this helps.

bakunin
 

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LEARN ABOUT CENTOS

zipcloak

zipcloak(1)						      General Commands Manual						       zipcloak(1)

NAME

       zipcloak - encrypt entries in a zipfile

SYNOPSIS

       zipcloak [-d] [-b path] [-h] [-v] [-L] zipfile

ARGUMENTS

       zipfile	Zipfile to encrypt entries in

OPTIONS

       -b path
       --temp-path path
	      Use the directory given by path for the temporary zip file.

       -d
       --decrypt
	      Decrypt encrypted entries (copy if given wrong password).

       -h
       --help
	      Show a short help.

       -L
       --license
	      Show software license.

       -O path
       --output-file zipfile
	      Write output to new archive zipfile, leaving original archive as is.

       -q
       --quiet
	      Quiet operation.	Suppresses some informational messages.

       -v
       --version
	      Show version information.

DESCRIPTION

       zipcloak encrypts all unencrypted entries in the zipfile.  This is the default action.

       The -d option is used to decrypt encrypted entries in the zipfile.

       zipcloak uses original zip encryption which is considered weak.

       Note:  The encryption code of this program is not copyrighted and is put in the public domain.  It was originally written in Europe and can
	      be freely distributed from any country including the U.S.A.  (Previously if this program was imported into the U.S.A, it	could  not
	      be  re-exported  from  the  U.S.A to another country.)  See the file README.CR included in the source distribution for more on this.
	      Otherwise, the Info-ZIP license applies.

EXAMPLES

       To be added.

BUGS

       Large files (> 2 GB) and large archives not yet supported.

       Split archives not yet supported.  A work around is to convert the split archive to a single-file archive using zip and then  use  zipcloak
       on the single-file archive.  If needed, the resulting archive can then be split again using zip.

SEE ALSO

       zip(1), unzip(1)

AUTHOR

       Info-ZIP

								v3.0 of 8 May 2008						       zipcloak(1)
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