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(a)
(i) Bob has public RSA key (n = 77, e = 7).
Show that Bob's private key is (d = 43).
(ii) Alice wants to send the message m = 13 to Bob. She encrypts the message using Bob's public key. What is the value of the ciphertext that Alice sends to Bob?
(iii) David has also sent an encrypted message to Bob. The ciphertext value that Bob receives from David is 17. Showing all your working, use Bob's key to decrypt this ciphertext and recover the value of David's message.
(b)
Consider cryptographic hash functions.
(i) What is meant by collision resistance for a hash function?
(ii) What common usage do hash functions have in connection with digital signatures?
(iii) What is the difference between a hash function and a message authentication code (MAC)?
(iv) Why is it recommended to use a hash function with 2n bits of output when it is used as component in a system designed for n bits of security?
QUESTION: (a) Suppose the graph below, use the Flow Decomposition method to list the cycles and paths produced. (b) Describe how Lower Bounds on Arc Flows are eliminated
Public Key Infrastructure (PKI) It is integrated system of software, encryption methodologies, protocols, legal agreements, and 3rd-party services enabling users to communicate
Asymmetric Encryption Asymmetric encryption method makes use of two different but related keys and either key can be used to encrypt or decrypt the message. This method is freque
QUESTION (a) FTP is a protocol used for the delivery of files across networks. Explain how FTP works (support your answer with a diagram). (b) How does TCP perform the gi
Problem (a) Give two reasons for companies to implement security measures. (b) What is the regulatory expectation regarding i. healthcare information, ii. financial
Data units at different layers of the TCP/ IP protocol suite The data unit prepared at the application layer is known a message, at the transport layer the data unit build is
In BUS topology every computer is directly connected to primary network cable in a single way. Bus networks are the easiest way to connect multiple users, but can have problems
Let me know the details of protocol tcp/ip
Question: a) Explain what the following intermediate systems are and how they work? i. Repeater ii. Bridge b) A service is formally specified by a set of primitives (op
define .
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