Defensive-programming meaning

Writing a secure program. Without security in mind, extensive validation of input is one area that is often overlooked. For example, if a small amount of data is expected as input, but the program accepts any amount, it provides a way for the cracker to insert executable code into the program. Using very clever hacking techniques, this code can be made to run.
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(programming) A form of defensive design that wants to ensure that the continuing functioning of a piece of software in spite of unforeseeable usage of it.
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