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2. (a) Given the RSA public key (3,70747) and private key (46811,70747). • Encrypt the letter z' using its ASCII value. • Decrypt the result from the subtask above and generate the original text. • Encrypt the word 'Cyber' two characters at a time padding with a space. • Decrypt the following three blocks 14520 66071 27623. The blocks are the encryption of a five-letter word, encrypted two characters at a time and padded with a space. Recover the word. • The blocks are the encryption of a five letter word, encrypted two characters at a time and padded with a space. Recover the word. • Determine the maximum block size, in bits, that this modulus can encrypt and decrypt.

2. (a) Given the RSA public key (3,70747) and private key (46811,70747). • Encrypt the letter z' using its ASCII value. • Decrypt the result from the subtask above and generate the original text. • Encrypt the word 'Cyber' two characters at a time padding with a space. • Decrypt the following three blocks 14520 66071 27623. The blocks are the encryption of a five-letter word, encrypted two characters at a time and padded with a space. Recover the word. • The blocks are the encryption of a five letter word, encrypted two characters at a time and padded with a space. Recover the word. • Determine the maximum block size, in bits, that this modulus can encrypt and decrypt.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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2. (a) Given the RSA public key (3,70747) and private key (46811,70747). • Encrypt the letter 'z' using its ASCII value. • Decrypt the result from the subtask above and generate the original text. • Encrypt the word 'Cyber' two characters at a time padding with a space. • Decrypt the following three blocks 14520 66071 27623. The blocks are the encryption of a five-letter word, encrypted two characters at a time and padded with a space. Recover the word. • The blocks are the encryption of a five letter word, encrypted two characters at a time and padded with a space. Recover the word. • Determine the maximum block size, in bits, that this modulus can encrypt and decrypt. (b) Critically compare, analyse and evaluate three authentication protocols including Needham- Schroeder protocol, Otway Rees, Kerberos. (c) Given Alice wants to communicate with Bob over an insecure network, you are required to • Design a protocol based on a shared secret key to allow them to authenticate each other; • Explain the limitation of using the shared secret key in this context.
Transcribed Image Text:2. (a) Given the RSA public key (3,70747) and private key (46811,70747). • Encrypt the letter 'z' using its ASCII value. • Decrypt the result from the subtask above and generate the original text. • Encrypt the word 'Cyber' two characters at a time padding with a space. • Decrypt the following three blocks 14520 66071 27623. The blocks are the encryption of a five-letter word, encrypted two characters at a time and padded with a space. Recover the word. • The blocks are the encryption of a five letter word, encrypted two characters at a time and padded with a space. Recover the word. • Determine the maximum block size, in bits, that this modulus can encrypt and decrypt. (b) Critically compare, analyse and evaluate three authentication protocols including Needham- Schroeder protocol, Otway Rees, Kerberos. (c) Given Alice wants to communicate with Bob over an insecure network, you are required to • Design a protocol based on a shared secret key to allow them to authenticate each other; • Explain the limitation of using the shared secret key in this context.
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