Questions

Some say that with the development of systems such as IPsec, the role the CAs play in modern communication will diminish and eventually cease. Comment on this statement.

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Three-way Handshake as a Security Threat

Give a detailed account of why the three-way handshake is a security threat.

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Can system intrusions be stopped? Support your response.

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Social engineering has been frequently cited as a source of network security threat. Discuss the different elements within social engineering that contribute to this assertion.

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Comparison of Authorization Models: NOS vs. Stand-alone OS

Compare the authorization model used by the network operating systems (NOSs) to that used by the old stand-alone operating systems

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Discuss the risks to the protected internal network as a result of a DMZ

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Why are system intrusions dangerous?

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Benefits of Authorization

What are the benefits of authorization?

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Discuss the benefits of system scanning.

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Increase in Virus and Worm Attacks

There seems to have been an increase in the number of reported virus and worm attacks on computer networks. Is this really a sign of an increase, more reporting, or more security awareness on the part of the individual? Comment on each of these factors.

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Discuss the many ways in which access can be abused.

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Discuss the role and function of a PKI

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Transport Layer Security Mechanisms

Are there security mechanisms applicable at transport layer? Is it safer?

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In a modern communication network, what are the limitations of a tree- structured CA system? Why is it necessary?

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Why is hacking a big threat to system security?

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Security Policies

Some security experts do not believe in security policies. Do you? Why or why not?

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List and discuss the types of hacker crimes.

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Kerberos Authentication Process Players

Discuss in detail the role played by each one of the five players in a Kerberos authentication process.

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Many predict that the future of e-commerce is pegged on the successful implementation of authentication. Discuss.

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System Intrusion Detection and Prevention

Discuss as many effective ways of responding to a system intrusion as possible. What are the best? Most implementable? Most cost-effective?

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Discuss the role of certificate authentication in e-commerce

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Why are design flaws such a big issue in the study of vulnerability?

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What is the best way to deal with hacking?

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Global Privilege in Authorization Systems

Discuss the concept of global privilege. Does it work well in a distributed authorization or centralized authorization?

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Describe the sequence of steps a sender of a message takes when sending the message with a digital signature. What steps does the receiver of such a message take to recover the message?

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Why is a hybrid cryptosystem preferred over symmetric and public key encryption systems?

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Circuit-Level vs. Network-Level Firewalls

What are circuit-level firewalls? How are they different from network-level firewalls?

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Discuss the benefits of enhancement of basic authentication with a cryptographic scheme such as Kerberos, SSL, and others. Give specific examples.

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Access Control: Least Privilege Principle

Discuss the benefits and problems resulting from the “least privilege” principle often used in access control.

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Network Layer Security Mechanisms and Efficacy

IPsec provides security at the network layer. What other security mechanism is applicable at the network layer? Do network layer security solutions offer better security?

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Compare or discuss the differences between any two security systems.

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What is a bastion router? How different is it from a firewall?

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Kerberos and SSL are additional layers to enhance authentication. Detail how these enhancements are achieved in both cases.

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Discuss a good security auditing system.

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Computer Network Fundamentals: Encryption Standards Security

Most of the encryption standards that are being used such as RSA and DES have not been formally proven to be safe. Why then do we take them to be secure—what evidence do we have?

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Firewall Services and Protocols

Search and discuss as many services and protocols as possible offered by a modern firewall.

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Authentication Policy Involvement

Making an authentication policy must be a well-kept secret to ensure the security of the intended system. Why then is it so important that a security policy include an authentication policy that involves as many as possible? What kind of people must be left out?

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Discuss the best approaches to implementing an effective IDS.

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Discuss the best ways of protecting an internal network using firewalls from the following attacks: * SMTP server hijacking * Bugs in operating systems * ICMP redirect bombs * Denial of service * Exploiting bugs in applications

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Reasons for Anonymous Authentication in High-Security Systems

There are many compelling reasons why a system that must implement security to the maximum must give anonymous authentication to a class of users. Detail five of these reasons.

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Four Access Methods and Their Weaknesses

Discuss four access methods, giving the weaknesses of each

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Physical Access Restrictions

Physical access to resources is essential and must be the most restricted. Why?

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Discuss ways a system administrator can reduce system scanning by hackers.

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Why are vulnerabilities difficult to predict?

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Why was VBScript not very popular?

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Sources of System Vulnerabilities

Discuss the sources of system vulnerabilities.

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Security Best Practices and Mechanisms

Security best practices are security guidelines and policies aimed at enhancing system security. Can they work without known and proven security mechanisms?

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Is it possible to implement full distributed authorization? What will be involved?

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Discuss the weaknesses of public key encryption

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Three Components of a Global Access Model

Discuss the three components of a global access model

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Discuss the differences between a firewall and a packet filter

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Firewall Design for File Uploads to Internal Network

How would you design a firewall that would let Internet-based users upload files to a protected internal network server?

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Discuss the weaknesses of symmetric encryption

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Network Vulnerability Identification

Is it possible to locate all vulnerabilities in a network? In other words, can one make an authoritative list of those vulnerabilities? Defend your response.

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Access Control and Authorization: Denying Document with Extended Links

Consider an environment where each server does its own authorization. If an access request is made to a document that has extended links and one of the link requests is denied, should the whole document request be denied? Why or why not?

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Describe the message authentication process using:

Describe the message authentication process using: (a) Symmetric encryption (b) Public key encryption (c) Hash function

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Anonymous Authentication and System Security

Does anonymous authentication compromise the security of systems for the advantages of a few services?

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Difficulties in Enforcing Security Best Practices

Discuss the difficulties encountered in enforcing security best practices.

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Differentiate between access and authorization.

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Web authorization and performance

Web authorization is central to the security of all Web applications. What is the best way to safeguard all Web applications and at the same time make Web access reliable and fast?

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CGI and Database Security

CGI is often used to manage extensive databases. Databases store sensitive information. Discuss security measures you can use to safeguard the databases.

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Differences between Digital Certificates and Digital Signatures in Authentication

Discuss the differences between digital certificates and digital signatures in authentication

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Choosing and Using Security Best Practices

If you are an enterprise security chief, how would you go about choosing a security best practice? Is it good security policy to always use a best security practice? What are the benefits of using a best practice?

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Authentication using certificates, although considered safe, suffers from weaknesses. Discuss these weaknesses using specific examples.

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Script Security Threat: Untrusted Data

The biggest script security threat has always been the acceptance of untrusted data. What is the best way for scripts to accept data and preserve the trust?

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Discuss the basic components of cryptography

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Discuss the advantages of using an application-level firewall over a network-level firewall.

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Scripting and Security in Computer Networks and Web Browsers

The most common CGI function is to fill in forms; the processing script actually takes the data input by the Web surfer and sends it as e-mail to the form administrator. Discuss the different ways such a process can fall victim to an attacker.

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CGI Scripting and Security

CGI is also used in discussions allowing users to talk to the customer and back. CGI helps in creating an ongoing dialog between multiple clients. Discuss the security implications of dialogs like this.

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Why is it difficult to implement distributed authorization?

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CGI and Web Programming Revolution

How did CGI revolutionize Web programming?

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Client-side vs. Server-side Scripting

What are the differences between client-side and server-side scripting? Is one better than the other?

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Client-side vs. Server-side Scripting Security

In terms of security, is client-side scripting better than server-side scripting? Why or why not?

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Firewall Protocol Implementation

Show how data protocols such as TCP, UDP, and ICMP can be implemented in a firewall and give the type of firewall best suited for each of these protocols.

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Software Verification and Validation (V&V) in System Vulnerability

Part of the problem in design flaws involves issues associated with software verification and validation (V&V). What is the role of V&V in system vulnerability?

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Differentiate between computer and network forensics.

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RPC Authentication: Per-Request Authentication

In RPC authentication, why it is necessary that each client request that server services be authenticated by the authentication server?

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Is hacking getting under control?

Following the history of hacking, can you say that hacking is getting under control? Why or why not?

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