CEC 304 Data Security & Integrity Exam 2023

About this paper

CEC 304: Second Semester Examination, 14/06/23 (answer any two of three 25-mark questions; all three answered here; one sub-part involves a scanned source with visible handwritten annotations that are redacted, not reproduced), University of Buea: an IKE/Diffie-Hellman exercise (different hash formula from Paper 3), a Fiat-Shamir zero-knowledge identification explanation, and ECC encryption/ECDH on the shared curve (with two of the question's own printed points not lying on the curve, corrected and flagged); a 3-bit substitution-box CBC exercise, DES iteration/S-box/fixed-password questions, the one-way password-check scheme (same table as Paper 6), and the Vigenere cipher (same ciphertext/keyword as Paper 7); and a Kerberos exercise (same artificial keys as Paper 6) plus an RSA hash-then-sign/verify exercise between two nodes.