Its always good practice to use state-of-the-art cryptography to stay ahead of hackers, and exploits are found from time to time. This is one reason why it's good to use multiple keys and different devices to avoid single points of failure.
Newly discovered Bitcoin wallet loophole let hackers steal $900K — SlowMist
A series of attacks drained the wallets of BTC users by exploiting a faulty random seed generation algorithm.