Question

In SHA-3, if the desired output is l bits, then j blocks are produced, such that

(a) (j-1) x r < l <= (j) x r

(b) (j) x r< l <= (j+1) x r

(c) (j-1) x r < l <= (j+1) x r

(d) (j+1) x r < l <= (j+2) x r

This question was posed to me in an interview.

This is a very interesting question from Secure Hash Algorithms (SHA) topic in division Other Public Key Cryptosystems and Cryptographic Hash Functions of Cryptograph & Network Security

Answer 1

Right option is (a) (j-1) x r < l <= (j) x r

For explanation: (j-1) x r < l <= j x r, is th correct option; ’l’ should lie between (j-1) x r and j x r.