encryption - Why is security through obscurity a bad idea?

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Answer 1

Security through obscurity would be burying your money under a tree. The only thing that makes it safe is no one knows it's there. Real security is putting it behind a lock or combination, say in a safe. You can put the safe on the street corner because what makes it secure is that no one can get inside it but you.

As mentioned by @ThomasPadron-McCarty below in a comment below:

If someone discovers the password, you can just change the password, which is easy. If someone finds the location, you need to dig up the money and move it somewhere else, which is much more work. And if you use security by obscurity in a program, you would have to rewrite the program.