Best way to protect a moored Capri from thieves

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I'm getting ready to tie my Capri to a mooring buoy just off the beach, and I'm concerned that a shackle isn't enough protection against someone slipping up at night a taking off with the boat.

To my knowledge, theft is not a problem in this area: I'm just a little paranoid.

Any suggestions for clever knots, strong mooring line rope, etc., that will help to deter theft?