Q1. In your own words, provide a short summary of the main findings of this article (no longer than one paragraph). 
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;  b) Implementation;  c) Key management;  d) Human factors. 
Q3. This article was written in the early 1990s.
a) Identify at least one fact relating to cryptography that is no longer true today.  b) To what extent do you regard the main findings of the article as being relevant to today? 
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?  b) In what way do these three digits enhance the security of a transaction? 
Q5. Explain what relationship exists between cryptocurrencies and cryptography. 
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