Insecurity through obscurity
Source: - Posted by Benjamin D. Thomas   
Security Security through obscurity is probably one of the oldest tricks in the security book. The basic premise stems from the fact that people are trying to ensure security by hiding certain facts of their software or architecture design from regular users. This is equivalent to someone hiding a house key under a pot of plants in front of his house.

However, Auguste Kerckhoffs, a 19th century Flemish cryptographer, said it should be assumed that attackers know the design of the entire security system, except for the keys. This concept, known as Kerckhoffs' law, basically rejected the notion of security through obscurity (your key hidden under your potted plant) and suggested that a system should be secure even if everything's public knowledge, except the key.

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