Final answer:
The technique described in the question is commonly known as a Honey Trap. It involves providing someone with a piece of data and monitoring if it reaches the public domain to identify information leaks.
Step-by-step explanation:
The technique described in the question is commonly known as a Honey Trap.
This is a tactic used to identify individuals who leak information by providing them with a piece of data and monitoring whether it reaches the public domain. It involves setting a trap to lure the leaker into revealing themselves.
For example, law enforcement agencies may use this technique to catch individuals leaking classified information. They may provide each suspected person with a unique piece of information and then monitor if that information is leaked.