Bash script encryption

Question

I'd like to create a bash script to encrypt my personal (text) files, and decrypt them when I need them.

The encryption method I want is, to convert all ASCII characters to hex, then add a value, and convert back to ASCII.

The value to add should be the hex value of a certain character in the file - based on it's position, so it would vary depending on what character happens to be there.

I know next to nothing about bash scripting and about Linux at all for that matter, can anyone please help me?

gpg -c filename would be a much better way - your encryption could be broken very easily by frequency analysis — exussum
– exussum, Commented Sep 30, 2013 at 16:36
I think you need to read this: security.stackexchange.com/questions/18197/… — Neil Forrester
– Neil Forrester, Commented Sep 30, 2013 at 16:40
The other problem with this is you're going to have a script named super_secret_encrypt.sh lying around that will easily show an attacker how to bypass your 'encryption'. Use GPG. — Sammitch
– Sammitch, Commented Sep 30, 2013 at 17:10

oleksii · Accepted Answer · 2013-09-30 22:35:42Z

4

Unless you trying to learn the history of cryptography forget about this. Anyone with limited knowledge of cryptography will break your code in minutes. A determined hacker will break this in seconds (using frequency analysis of single letters, doublets and triplets).

For encryption (approach you described can hardly be called encryption. It is rather cipher), use stable, proven algorithms (AES, 3DES, TwoFish, Serpent) and tools, such as GPG, TrueCrypt.

edited Sep 30, 2013 at 22:35

answered Sep 30, 2013 at 16:41

oleksii

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Ir Relevant Over a year ago

Silly me, but I still want it! Can anyone please help?

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