Hash Functions

Question 1

What is Pre-Image Resistance?

Answer 1

This property ensures that no one should be able to reverse or invert the hash function in order to recover the input given an output

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Question 2

What is Second Pre-Image resistance?

Answer 2

This property says that, if given an input, you should not be able to find a different input that hashes to the same digest

Question 3

What is collision resistance?

Answer 3

It guarantees that no one should be able to produce two different inputs that hash to the same output.

Question 4

Other good properties of hash

Answer 4

1) fast for integrity
2) slow for password hashing
3) long length, at least 256 bit long
4) unpredictable