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Correction - Question 3 of the Computer security Zone A examination paper was omitted from page 401 of the 2003 booklet

Question 3
In a cryptosystem why is a large keyspace and a large blocksize essential
for security? [1]
What are the blocksize and keysize for the Data Encryption Standard (DES)? [1]
Why is the DES now considered to be weak? [1]
Describe Triple-DES in terms of DES. [2]
What are the blocksize and keysize for Triple-DES? [1]