3. In the 1970s, commercial cryptography enjoy limited use. Consider the use of cryptography to protect communications between the managers of two banks in the 1970s. Keeping in mind the likely systems and procedures in place, provide a brief analysis of the main likely threats to this encrypted traffic. Then comment on whether you feel today's use of cryptography to protect web traffic is more or less secure than the 1970's scenario, justifying your answer. [6 marks]