Is it possible to password protect a private key with let's encrypt?

Question

linux

Is it possible to set a password for a private key when obtaining a certificate with lets encrypt or add a password to an already existing private key privkey.pem obtained in the same place?
OS: CentOS 7
certbot: 1.5.0

Answer 1

openssl rsa -aes256 -in your.key -out your.encrypted.key

Original