Question

In SHA-3, for a message digest size of 256, what is the bitrate ‘r’ (capacity = 512) ?

(a) 576

(b) 1088

(c) 1152

(d) 832

This question was posed to me during an interview for a job.

I want to ask this question from Secure Hash Algorithms (SHA) in portion Other Public Key Cryptosystems and Cryptographic Hash Functions of Cryptograph & Network Security

Answer 1

The correct choice is (b) 1088

To explain I would say: In SHA-3,  c+r  = 1600, therefore here ‘r’ = 1088.