Final answer:
The four scenarios are matched with the cyber security dimensions: 'a' with availability, 'b' with integrity, 'c' with non repudiation, and 'd' with authenticity. These dimensions are vital to maintaining online privacy and security, and both individuals and organizations must apply rigorous protective measures.
Step-by-step explanation:
To match the given descriptions with one of the six dimensions of cyber security: a. I can't logon to a website I want to logon to. - This scenario is associated with availability, which refers to the reliability of access to information and computing resources.
b. I ordered 50 rain coats, but somehow the order got changed to 5,000. - This situation touches on integrity, which ensures that data is accurate, complete, and has not been tampered with. c. A firm delivers an order to Mary - but Mary says "I didn't order these items!" - This falls under nonrepudiation, ensuring that a party in a transaction cannot deny the authenticity of their signature on a document or the sending of a message that they originated.
d. Andy receives an email that claims to come from "Joe Biden", but Andy doubts "Joe Biden" actually sent it. - This relates to authenticity, which is the assurance that a communication or document is genuine. Understanding these dimensions is crucial in an age where online privacy and security are increasingly important, as evidenced by the rise in data breaches affecting both individuals and large organizations.