Openssl encrypt and decrypt a file

denzuko · December 21, 2018, 11:17pm

gist.github.com

https://gist.github.com/dreikanter/c7e85598664901afae03fedff308736b

encrypt_openssl.md

## Symmetic encryption

For symmetic encryption, you can use the following:

To encrypt:

    openssl aes-256-cbc -salt -a -e -in plaintext.txt -out encrypted.txt

To decrypt:

This file has been truncated. show original

hon1nbo · December 21, 2018, 11:34pm

This is so painful to read. 8912 bit keys, S/mime as local encryption, CBC modes of AES.

denzuko · December 22, 2018, 12:56am

yeah but it helps the neophytes. Got any tips so they can do better?

hon1nbo · December 23, 2018, 3:21am

Don’t try and finagle openssl to do something it isn’t meant to do.

Use standard key sizes, utilities such as dm-crypt/LUKS and GPG are designed for in-place encryption and will work better for that purpose.

I could go on but I don’t have a handy beginner’s pointer on-hand.