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Assume that Alice shares a secret s with her company's server computer. When Alice is on a trip, she tries to store an important message in the CEO's account directory. This message needn't be encrypted since confidentiality is not important here, but the CEO needs to be guaranteed that the message really is from someone who knows the secret s (e.g. Alice) when the CEO opens his/her computer the next day. A naïve protocol to achieve this may look like this:
Alice-->Server: "This is Alice, I have an important message to forward to the CEO"Server-->Alice: "OK, please encrypt R" (where R is a random nonce)Alice-->Server: "Es(R)" (that is, R is encrypted with the secret s)Server-->Alice: "Please send the message"Alice-->Server: "The CEO needs to attend a meeting in Liverpool on May 1, 2006"The server stores this message in the CEO's directory
Is this protocol secure? If not, how do you feel it could be modified to make it so?
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A report on Tools to enhance Password Protection.
Users are familiar with some network services like HTTP (Hypertext Transport Protocol) - the Web; and SMTP. Tell us more about these services. How do they figure into organizational security? Elaborate with specifics.
Organization that severely lacks in appreciating the need for security or a company that depends on equipment that is outdated and services from contractors that are low quality? Why?
Would it be reasonable to compute an RSA signature on a long message by ?rst computing what the message equals mod n, for some ?xed n and then signing this computed value only. Why or why not?
Students would enter the room, pick up their jobs, and leave. What kinds of security problems might computer services encounter with a system such as this?
Would it be reasonable to compute an RSA signature on a long message by first finding what the message equals, mod n, and signing that?
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Analyze security requirements and prepare a security policy.
Alice and Bob select the numbers 6 and 10 privately. What will be public values they transmit and what would be final secret computed?
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