Question

Which of the following best describes the use case for zero-knowledge protocols (ZKPs)?

1) Choosing what to do when you have zero knowledge of a subject
2) Being made aware of when the battery in a product is past its zero point
3) Handling divide-by-zero errors in computing software
4) Proving that something exists, but not the specifics

Answer 1

The best use case for zero-knowledge protocols (ZKPs) is 'Proving that something exists, but not the specifics', which ensures privacy by revealing no additional information. Problem-solving in ZKPs involves identifying knowns and unknowns, as well as ensuring that solutions leak no extra information.

Step-by-step explanation:

The question relates to the use case for zero-knowledge protocols (ZKPs). Among the options provided, the correct description of a ZKP use case is option 4, which is 'Proving that something exists, but not the specifics'. Zero-knowledge protocols are a form of cryptography that allow one party to prove to another that a statement is true, without revealing any additional information apart from the fact that the statement is indeed true. This ensures that the verifier learns nothing other than the fact being proven, maintaining privacy and security.

To solve problems involving ZKPs and other cryptography concepts, one often has to identify knowns and unknowns, such as the information that has to be kept secret and what needs to be proven. Checking whether a solution is reasonable, often involves ensuring that no extra information is leaked beyond what is intended when using a ZKP.