The only truly secure way to protect large amounts of bitcoin is cold storage.
http://assafshomer.blogspot.co.il/20...d-storage.html
If you use blockchain.info I suggest a yubikey. There's a group buy for 40% off on massdrop right now.
https://www.massdrop.com/buy/yubikey-standard
I have a... friend who lost over $10K becasue he didn't use 2-factor authentication on blockchain.info