One good example is that typical encryption works like locking the door to your house – while the lock can be very strong, anyone who manages to steal your key while you are out can unlock the door. The overall strength of the system is only as strong as your pocket! You could lock your key in a friend’s house, but now attackers just need to steal your friend’s key. Plus, attackers can passively observe people coming and going, so they are generally well prepared to figure out where to start.
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