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1. Using the English alphabet (i.e., mod 26 arithmetic) let plaintext = {p1, p2,... , pn} and corresponding ciphertext = {c1, c2,... , cn}. Suppose the encryption function is ci = pi + 15 (mod 26). If you receive the ciphertext message YPHDCRPBEQTAA, decrypt to recover the plaintext. What is the decryption function, and the recovered plaintext? What type of cipher is this?
2. A 1,048,576-bit message is used to generate a 10-bit hash. One the average, how many other messages could be expected to generate the same hash value?
You have taken a job with a software user who has contracted your previous employer to develop a system for them. However, you have also a responsibility of confidentiality to your previous employer.
After completing the Unit reading on the subject, give your sense of the level of cyberphobia in the workplace and your suggestions on dealing with it as an IT manager.
What is the ciphertext (in binary form) generated by the encryption of character D? How is plaintext for this encrypted D recovered?
What are your thoughts regarding vulnerabilities surrounding the computing world today and the risks of computers being attacked.
If you receive the ciphertext message YPHDCRPBEQTAA, decrypt to recover the plaintext. What is the decryption function, and the recovered plaintext? What type of cipher is this?
cryptography assignment: Consider the following problems: (P1) computing the output p from an input n; (P2) computing the output phi(n) from an input n. Which one of the following statements is true?
Authentic Assessment: The scenario will be a realistic, enterprise-level situation encompassing diverse networking components, including Microsoft Windows, Linux, VoIP, security, wireless, and Cisco technologies.
You have secretly picked value SA = 17. You begin session by sending Bob your computed value of TA. Bob responds by sending you value TB = 291. What is the value of your shared secret key?
Describe why you recommend it is so important to secure your Windows and Unix/Linux servers from known shortcomings/vulnerabilities.
Security mechanism, threat, GSM networks, DDoS attacks, IPv4, IPv6, IPsec integrity, authentication and privacy, IPsec AH, ‘single sign-on' in the context of access control, Secure Electronic Transaction (SET) protoco, Encryption
What security features could be given without changing mail delivery infrastructure, i.e., by only running special software at source and destination?
Using only asymmetric encryption algorithms, describe a process that would allow Alice to send a message that can only be read by Bob. You should include any steps taken by Bob that allow him to read the message.
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