Birthday-Attack — CISSP Practice Questions

A birthday attack exploits the mathematics of the birthday paradox to find two different inputs that produce the same hash output, which is called a collision. The CISSP exam expects candidates to understand why collision probability grows faster than intuition suggests as the number of attempts increases, and why this influences minimum recommended hash digest lengths. In practice, a successful birthday attack against a hash algorithm used in digital signatures could allow an attacker to substitute a fraudulent document while keeping a valid signature intact. This is why algorithms producing shorter digests, such as MD5 and SHA-1, are no longer considered secure for integrity or signing purposes.

Free questions on birthday-attack