Fuzz Testing
Fuzz testing automatically generates large volumes of random, malformed, or unexpected input and feeds it to a system to find crashes, hangs, memory issues, or unhandled exceptions — a brute-force way to discover edge cases and vulnerabilities no human tester would think to try by hand.
A fuzzer doesn't need to understand the system's logic to be effective — it can generate thousands or millions of malformed inputs per second, and anything that causes a crash, an unhandled exception, or an unexpected resource spike gets flagged for a human to investigate further, since fuzzers find problems without knowing what a "good" outcome looks like.
It's particularly valuable for security testing specifically because many serious vulnerabilities — buffer overflows, injection flaws, deserialization bugs — are triggered exactly by the kind of malformed, boundary-pushing input a fuzzer excels at generating far more exhaustively and tirelessly than manual negative testing ever could.
