Encrypt/descrypt with OpenSSL and RSA

OpenSSL and RSA.md

OpenSSL and RSA

You can encrpt files using a private/public keys.

First, create the keys:

openssl req -x509 -nodes -days 100000 -newkey rsa:2048 \
  -keyout private.pem -out public.pem -subj /

Encrypt the important.file with:

openssl smime -encrypt -aes256 -in important.file -binary \
  -outform DEM -out file.secure public.pem

And decrypt it with

openssl smime -decrypt -in file.secure -binary -inform DEM \
  -inkey private.pem -out important.file