Answered: Recall that the sponge construction…

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

See similar textbooks

Related questions

Question

Recall that the sponge construction describes how to turn a public random permutation into a cryptographic hash function. Once the data to be hashed has been padded, the next step is to absorb the data r bits at a time.

blk = <0>
while not done:
xor the next r bits of data into the first r bits of blk
blk = p(blk)

As a convenient (but not secure because it's too small) public random permutation, lets use the AES S-box for p. What is blk after absorbing each of the following when r=4 bits. Give your answer as exactly either 2 hexadecimal digits or 8 binary digits with no spaces (eg, 0A or 00001010). Note that the data is already padded and you should restart at blk=<0> each for each computation

Data: 1001 Resulting blk:____

Data 10011001 Resulting blk:_____

Data 100110011001 Resulting blk:____