This article was written in the early 1990s.

Q1. In your own words, provide a short summary of the main findings of this article (no longer than one paragraph). [4]  
Q2. Provide an example from the article (or inspired by the article) that shows how a cryptosystem could fail due to weaknesses in:
a) Algorithms; [1] b) Implementation; [1] c) Key management; [1] d) Human factors. [1]
Q3. This article was written in the early 1990s.
a) Identify at least one fact relating to cryptography that is no longer true today. [2] b) To what extent do you regard the main findings of the article as being relevant to today?  [4]
Q4. When buying something online, you are often asked to provide the “three digits on the back of the card”.
a) How are these three digits typically computed? [3] b) In what way do these three digits enhance the security of a transaction? [3]
Q5. Explain what relationship exists between cryptocurrencies and cryptography. [5] 

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