Which hash attack finds two inputs with identical hashes?

Question

BlackTom AI · Accepted Answer

Question: Which hash attack finds two inputs with identical hashes?

Option a: Relay. This term refers to a credential-stuffing or authentication technique involving relaying credentials, not about finding two inputs with the same hash. It does not describe a collision-finding method.

Option b: Pass-the-hash. This is an attack where an attacker uses a captured hash to authenticate as a user, bypassing the need to know the actual password. It is about authentication with a hash, not about discovering two inputs that collide in a hash function.

Option c: Rainbow. Rainbow tables are used to reverse cryptographic hash functions by precomputing chains of hashes to crack passwords, but the specific goal of rainbow tables is not to find two inputs that yield identical hashes; rather, they accelerate password recovery by reversing hashes, though collisions can occur in general, the canonical term for two inputs producing the same hash is different.

Option d: Birthday Attack. This is the classic name for a method that exploits the birthday paradox to find two inputs that hash to the same value, i.e., a collision. The idea is that with a sufficient number of random inputs, collisions become surprisingly likely, illustrating why hash functions require strong collision resistance.

Summary of the distinctions:
- Relay and Pass-the-hash concern credential transmission or authentication, not collision discovery.
- Rainbow tables focus on reversing hashes for password cracking, not specifically on finding two inputs with identical hashes.
- Birthday Attack directly targets hash collisions by exploiting probability, matching the described goal of identifying two inputs with identical hashes.

Which hash attack finds two inputs with identical hashes?单项选择题

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