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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?
What RC4 key value will completely invert S after the initial permutation (so that S[0] = 255, S[1] = 254, ..., S[254] = 1, S[255] = 0)? Show your work. (Explain how you got this.)
block cipher and a stream cipher, Caesar cipher, cryptanalytic attacks, mono alphabetic cipher and a poly alphabetic cipher, Mix Columns, Add Round key, PGP services, traffic padding, contrast link and end-to-end encryption
Denial of Service attack (DoS) and Distributed Denial of service (DDoS) attack, two-factor authentication system, password ageing, biometric devic, cryptographic attack made Double DES (2DES), Demilitarized Zone (DMZ), SSL protocols
Explain in scholarly detail on whether you believe security measures currently in place give adequate security as well as privacy, or do you believe these issues being emphasized are at the expense of the other?
Large Commercial Corporation has witnessed a terrorist security breach of network, and has discovered one laptop on the scene belonging to victim.
Which is more probably to be effective in protecting intellectual property in digital media like CDs and DVDs: tougher copyright laws or new technologies incorporating more sophisticated anti-copying measures?
Using blocks of 4 encrypt the message I AM AN MSC STUDENT MAJORING IN SECURITY using the public key above. Similarly use the private key above to decrypt the cipher text.
You were given the following plaintext and cipertext, and you are needed to find key used by them. plaintext: Using Vigene table, find key used by them to encrypt the message.
Why do you think DoS attackers use zombies to attack victims instead of sending attack packets directly to victims? Come up with two reasons.
The pattern or generator is P 1001. Calculate the CRC or FCS for the sender. You must give the details of this calculation.
Question on Security infrastructure and protocols
Cross-talk, and other forms of interference are a significant issue in any communications infrastructure. Compare and contrast how this problem would manifest for analog data transmitted
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