RSA with PKCS encryption and Mavericks support

gistfile1.sh

# Create a rsa key with 4096 bit encryption. This is far more secure than 2048.
# The email is just a plain comment. Make sure you enter a passphrase!
ssh-keygen -t rsa -b 4096 -C "your_email@example.com"

# The basic passphrase security is rather bad and easy to break. Read the following article why:
# http://martin.kleppmann.com/2013/05/24/improving-security-of-ssh-private-keys.html
mv id_rsa id_rsa.old
openssl pkcs8 -topk8 -v2 des3 -in ~/.ssh/id_rsa.old -out ~/.ssh/id_rsa
chmod 600 ~/.ssh/id_rsa

# Now you have an encrypted and rather difficult to break key.

# On MacOS Mavericks you will have a heard time getting things to work. I found this article and it seems to work:
# http://apple.stackexchange.com/questions/106364/osx-ssh-agent-no-password-pasting-and-problem-with-pkcs8
brew update
brew install openssl
brew link openssl --force
brew install openssh

# Now everything should be working again