Cyber Test 2 Flashcards
Revision for cybersecurity test 2
How does PKI ensure confidentiality
PKI ensures confidentiality by using encryption to scramble data so that only the intended recipient can read it.
How does PKI use asymmetric encryption?
PKI uses a public key and a private key to encrypt and decrypt data. The public key is available to anyone but the private key is kept secret by the recipient.
How does PKI ensure integrity?
PKI ensures confidentiality using digital certificates and registration authorities.
What does a digital certificate do?
A digital certificate binds an entity’s public key to it’s identity information. When a user presents a certificate, the recipient can verify the certificates authenticity using the issuers public key.
What does a registration authority do?
Registration authorities validate the identities of entities before a certification authority issues a digital certificate.
How does PKI ensure non-repudation?
PKI ensures non-repudiation by using digital signatures.
What is a digital signature used for?
Digital signatures are used to confirm that a specific user performed certain actions at a specific time.
What does an IDS do?
An IDS observes network traffic and looks for attack patterns or anomalies, if it finds one it will generate an alert, it does not alter network traffic.
What does an IPS do?
An IPS examines traffic for real-time attacks and intervenes to stop them on detection.
What is the main difference between an IPS and an IDS?
The main difference between an IDS and an IPS is an IPS will actively stop threats and an IDS will only detect them and generate an alert.
What are the disadvantages of using an IPS?
An IPS can not detect new or unknown threats without a signature update. An IPS may falsely detect normal network traffic as a threat. An IPS can impact network performance.
Why is it bad if an IPS generates a false positive?
When an IPS detects normal network traffic as a threat and blocks it, it can lead to network disruptions and delays.
How can you prevent an IPS from generating false positives?
An IPS can be prevented from generating false positives though careful configuration and tuning.
How can an IPS impact network performance?
An IPS can impact network performance by analysing and blocking traffic. This can cause latency issues, especially if there is more than one IPS on a network or if the network doesn’t have enough bandwidth.
