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Security Infrastructure and Protocols
a) PKI and PGP are two methods for generating and managing public keys for use in protocols such as secure email. Compare and contrast the trust models for public keys used in PKI and PGP, and assess the statement that a PKI is a "top-down" approach to trust and PGP is a "bottom-up" approach to trust.
b) The SSL protocol uses (X.509) certificates to create a secure session between a server and a client in a web session. Discuss the browser-based trust modelassumed in SSL, and compare it with the trust model used in Kerberos. Kerberos is designed to operate is a relatively small domain, such as a single company. Discuss the practical issues around extending the Kerberos trust model to a global scale, say to provide secure services between Amazon and its customer base.
US cryptography export restrictions: past, present, and future and biometrics for authentication: security and privacy implications.
An earlier version of WTLS supported a 40-bit XOR MAC and also supported RC4 stream encryption. Show that this scheme doesn't give message integrity protection.
Why would a variation of RSA encryption/decryption where a single prime number is used the modolus insecure? How can someone recover a message x from the encrypted value.
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?
Suppose that Alice shares secret with her company's server computer. When Alice is on trip, she tries to store important message in CEO's account directory. Is this protocol secure? If not, how do you feel it could be modified to make it so?
It has been recommended in some quarters that for large projects, decisions on any changes that materially affect assignment milestones
Defacement, Infiltration, Phishing, Pharming, Insider Threats, Click Fraud, Denial of Service, Data Theft/Loss, IP Whitelisting and IP Spoofing, recursive PHP functio, worm and a virus, hash on a string using MD5
How can we apply division method to calculate hash value of character string without using more than constant number of words of storage outside string itself?
Discuss why are many of the reliable, effective biometric systems perceived as intrusive by users and what are stateful inspection firewalls and how do the tables track the state and context of each exchanged packet?
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
honeypot or a firewall, error handling, Denial-Of-Service, Public Key Infrastructure, WLAN Administrator, WEP Protocol, RSA Algorithm, Network Engineer
DNS Cache Poisoning attack, Turtle Shell Architecture,
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