What are the advanced encryption standards(AES)?
The Advanced Encryption Standard (AES) is a symmetric block cipher chosen by the U.S. government to protect classified information. AES is implemented in software and hardware throughout the world to encrypt sensitive data. It is essential for government computer security, cybersecurity, and electronic data protection.
Explain the substitution and transposition techniques?
The substitution and transposition techniques are used for converting plaintext into ciphertext, where substitution technique replaces the characters whereas transposition technique rearranges the characters to form a ciphertext. However, a substitution cipher is simpler and easy to break.
Explain the intruders and intrusion detection?
Intruders are the attackers who attempt to breach the security of a network. They attack the network in order to get unauthorized access. Intruders are of three types, namely, masquerader, misfeasor, and clandestine user. An intrusion detection system (IDS) is a device or software application that monitors a network for malicious activity or policy violations. Any malicious activity or violation is typically reported or collected centrally using a security information and event management system.
Briefly explain the hackers and hacker's techniques and explain firewall?
A hacker is an individual who uses a computer, networking, or other skills to overcome a technical problem. The term also may refer to anyone who uses their abilities to gain unauthorized access to systems or networks in order to commit crimes.
- Bait and Switch
- Cookie Theft
- Denial of Service/Distributed Denial of Service (DoS/DDoS)
- Eavesdropping
- Keylogging
- Malware
- Phishing and Related Phenomena
- Watering Hole and WAP Attacks
- “Man in the Middle” (or “MITM”) Attack
Firewalls:
A Firewall is a network security device that monitors and filters incoming and outgoing network traffic based on an organization's previously established security policies. At its most basic, a firewall is essentially the barrier that sits between a private internal network and the public Internet
Briefly explain the Firewall and types of firewall?
A Firewall is a network security device that monitors and filters incoming and outgoing network traffic based on an organization's previously established security policies. At its most basic, a firewall is essentially the barrier that sits between a private internal network and the public Internet
Types of firewall:
Firewall types can be divided into several different categories based on their general structure and method of operation. Here are eight types of firewalls:
- Packet-filtering firewalls
- Circuit-level gateways
- Stateful inspection firewalls
- Application-level gateways (a.k.a. proxy firewalls)
- Next-gen firewalls
- Software firewalls
- Hardware firewalls
- Cloud firewalls