13b - Internet Security Flashcards
(7 cards)
1
Q
What are two purposes of the addition of the digital signature to a message?
A
- To authenticate/confirm identity of sender
- To detect if message has been tampered with/altered/changed
2
Q
What is the difference between Symmetric Key and Public Key encryption?
A
- Symmetric key encryption: the same key/process/algorithm is used for encrypting and decrypting
- Public Key encryption: a public key and a private key are used in combination; one to encrypt, the other to decrypt
3
Q
Why is a firewall needed if the school wants to connect to the Internet?
A
- To prevent unauthorized access to a private network
- To safeguard the school’s network against hackers
- To block internal access to specific external sites
- To block certain ranges of IP addresses
- To close ports
4
Q
List four measures that can be used to reduce the threat posed by viruses.
A
- Use Anti-Virus Software
- Implement a Firewall
- Use a Proxy Server
- Employ Spam Filters
- Use Web Filters
- Utilize Digital Certificates
- Use Digital Signatures/Checksums
5
Q
What is the key exchange problem in relation to a symmetric cipher?
A
How to pass the key from the sender to the receiver without it being intercepted securely
6
Q
What is a Virus?
A
Program that attaches itself to/conceals itself within another program/file; Self-replicating; Has malicious purpose
7
Q
Explain the difference between a virus and a worm.
A
- Worm duplicates by exploiting network security weaknesses
- Worm is standalone software
- Worm replicates without user action
- Virus copies itself by attaching to other files
- Virus conceals itself within another file
- Virus relies on user running program to replicate it