Understanding Cryptographic Hash Functions

The video explains cryptographic hash functions, their applications, and key properties. It covers their use in digital signatures, bitcoin, and other protocols. The video also discusses the deterministic nature of hash functions, their efficiency, collision resistance, and challenges in ensuring security.

Which of the following is NOT a cryptographic hash function mentioned in the video?

• MD5

• AES

• RIPEMD

• SHA-256

What is the primary characteristic of a cryptographic hash function's output?

• It varies in length based on input size.

• It is always shorter than the input.

• It is of fixed length regardless of input size.

• It is always longer than the input.

What is the significance of a hash function being deterministic?

• It produces different outputs for the same input.

• It produces the same output for the same input.

• It produces random outputs for any input.

• It produces outputs of varying lengths.

What does the 'cryptographic' qualifier imply about a hash function?

• It is used only in hash tables.

• It is faster than traditional hash functions.

• It has specific design goals for security applications.

• It is used only for storing data.

What is a key difference between traditional and cryptographic hash functions?

• Cryptographic hash functions have specific security properties.

• Traditional hash functions are always deterministic.

• Traditional hash functions are used in cryptography.

• Cryptographic hash functions are slower.

Which property ensures that a cryptographic hash function is efficient?

• Collision resistance

• Computational efficiency

• Randomness of output

• Deterministic output

What does collision resistance in a hash function mean?

• It is impossible to find any input with a given output.

• It is difficult to find two inputs with the same output.

• It is easy to find two inputs with the same output.

• It is impossible to find two inputs with the same output.

What is the role of randomness in the output of a cryptographic hash function?

• To ensure the output is predictable.

• To make the output appear unrelated to the input.

• To ensure the output is always the same.

• To make the output longer than the input.

What is the main challenge in designing a collision-resistant hash function?

• Ensuring it is impossible to find any collisions.

• Ensuring it is used in hash tables.

• Ensuring it is difficult to find collisions.

• Ensuring it is computationally efficient.

Why is it challenging to guarantee the properties of cryptographic hash functions?

• Because they are not used in practice.

• Because new methods can be developed to find collisions.

• Because they are not based on mathematical principles.

• Because they are only theoretical concepts.