13b - Internet Security
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What are two purposes of the addition of the digital signature to a message?
• To authenticate/confirm identity of sender • To detect if message has been tampered with/altered/changed
What is the difference between Symmetric Key and Public Key encryption?
• 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
Why is a firewall needed if the school wants to connect to the Internet?
• 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
List four measures that can be used to reduce the threat posed by viruses.
• Use Anti-Virus Software • Implement a Firewall • Use a Proxy Server • Employ Spam Filters • Use Web Filters • Utilize Digital Certificates • Use Digital Signatures/Checksums
What is the key exchange problem in relation to a symmetric cipher?
How to pass the key from the sender to the receiver without it being intercepted securely
What is a Virus?
Program that attaches itself to/conceals itself within another program/file; Self-replicating; Has malicious purpose
Explain the difference between a virus and a worm.
• 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