She twigged when she got home because he'd used a secret code to turn off an alarm.
The Sun
But a brilliant new book has let us in on the secret code.
The Sun
The bitcoin wallet must be unlocked, and only he knows the secret code.
Times, Sunday Times
The operation's secret code headed the list of action that was to take place.
Times, Sunday Times
Only he who knows the correct secret code has the wealth.
Times, Sunday Times