(ISC)2 Certified in Cybersecurity Practice Exam

What is the maximum bit size for SHA-2 hashes?

1. 256

2. 384

3. 512

4. All of the above

The correct answer is: All of the above

In the context of SHA-2, the term refers to a family of cryptographic hash functions that includes several different hash lengths, specifically 224, 256, 384, and 512 bits. Each of these variants is designed to produce a hash output of the specified bit size, with 224, 256, and 384 being less commonly utilized compared to the more frequently used 256 and 512. By stating "All of the above," it acknowledges that SHA-2 supports multiple hash sizes. The architecture allows for both smaller and larger hash outputs, which is beneficial for various applications in cybersecurity. For example, using a 256-bit hash may be adequate for many applications, while a 512-bit hash might be preferred for those requiring a higher level of security or less collision risk. Recognizing that SHA-2 caters to different needs by providing hash lengths of 256, 384, and 512 bits highlights the versatility of the SHA-2 family. This understanding of cryptographic hashing is essential for grasping how to implement security mechanisms effectively, as different scenarios may warrant different hash output sizes depending on the security requirements of the system in question.