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Top Forums UNIX for Dummies Questions & Answers Saving an unencrypted copy of a file encrypted with vi Post 302897558 by Perderabo on Monday 14th of April 2014 07:06:06 PM
Old 04-14-2014
The last time I did this was in the 80's. and my memory is a bit hazy...

I think you need the crypt command. Write the file out, it will be encrypted and let's call the output ciphertext. Then run:
Code:
crypt < ciphertext > plaintext

I don't remember if crypt will prompt you for the key or if you pass it as a parameter. Give that a try and please let us know if it works.
 

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crypt(3C)																 crypt(3C)

NAME
crypt - generate hashing encryption SYNOPSIS
Obsolescent Interfaces DESCRIPTION
crypt(): is the password encryption function. It is based on a one way hashing encryption algorithm with variations intended (among other things) to frustrate use of hardware implementations of a key search. key is a user's typed password. salt is a two-character string chosen from the set this string is used to perturb the hashing algorithm in one of 4096 different ways, after which the password is used as the key to encrypt repeatedly a constant string. The returned value points to the encrypted password. The first two characters are the salt itself. Obsolescent Interfaces generate hashing encryption. WARNINGS
The return value for points to data whose content is overwritten by each call. and are obsolescent interfaces supported only for compatibility with existing DCE applications. New multithreaded applications should use SEE ALSO
crypt(1), login(1), passwd(1), getpass(3C), passwd(4), thread_safety(5). STANDARDS CONFORMANCE
crypt(3C)
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