Flashcards
Computer Science: Unit 6: Security
Cards in this deck (31)
- 1Data SecurityProtecting the privacy and integrity of data on computer systems
- 2PrivacyWhen data is only seen by people with permission. Data isn't disclosed outside this limit.
- 3What are some threats to data? 3Accidental damage
Natural disaster
Malicious action - 4Archived dataData no longer needed for immediate processing, but needs to be kept.
- 5What are some examples of Accidental Damage to files? How can you combat these?Human error - back up data, verification
Physical damage eg flood/fire - waterproof/fireproof case/room
Hardware failure - use correct procedure
Power surge - surge control
Loosing a storage device - 6MalpracticeNot doing your work properly
- 7PhishingSending a fake email or other message looking like an email from a real company. Will ask for password or other details when send to a legitimate - looking website
- 8PharmingMalicious code installed onto the victims hard-drive. Re-directs to legitimate looking site without their knowledge.
- 9IntegrityProtecting data from being lost, damaged or corrupted
- 10What are the advantages 2 and disadvantage 2 of Passwords?Adv - don't cost anything, easy to use
Dis - sometimes forgotten, can be guessed - 11What is an advantage and disadvantage of an ID card?Adv - can be read by a person or computerised system
Dis - easily lost - 12What is an advantage and disadvantage of Bio metric Check?Adv - Difficult/impossible to steal bio metric features
Dis - expensive equipment - 13How to keep things secure 4:Use biometric data
make passwords longer
use special characters in passwords
set max number of attempts - 14Trojan Horse emailclick link - install virus - records keystrokes, provide access to files, spam others
- 15Virus generated emailAppear sent from a friend - typically ask for emergency cash - friend infected
- 16LANLocal Area Network
- 17RouterJoins LAN to internet
- 18Audit trails and logsMaintain record of all activity taken place on a computer system Times and dates logged - assist in detecting security violations.
- 19Access RightsCan only see own files. Users and system administrations have different levels of access rights. Some users can read but can't edit. May include encryption of some files.
- 20Proxy servera computer that acts as an intermediary between a web browser and the internet. Used by networks in organisations. Improve web performance by storing a copy of frequently used web pages.
- 21What does a Proxy Server do?Gateway from one network to another
Keeps IP address a secret - filters
Request from computer to proxy server
forward request to web server - filter and search then send. Don't make connection directly to website - protected - 22FirewallSoftware that checks data coming from the Internet or a network
- 23TLSTransport Layer Security - control start and end of a communication link - 2 parts - makes communication private.
- 24What are the 2 parts of TLS?Record protocol - breaks communication down into records - hold data
Handshake protocol - how computers recognize one another - includes authentication and encryption - 25SSLSecure Sockets Layer - used before TLS, less secure. Authentic and encryption used
- 26EncryptionEncoding of data so that it can no longer be easily understood. Process of convert plaintext into ciphertext.
2 inputs - plaintext and secret key - 27Plaintext Key Ciphertext Encryption AlgorithmPlaintext - original message
Key - sequence of numbers used to encrypt or decrypt
Ciphertext - the encrypted message
Encryption Algorithm - formula for encrypting the plaintext - 28What are 2 encryption Techniques?Symmetric Encryption
Asymmetric Encryption - 29Symmetric EncryptionPrivate key - single key used to encrypt and decrypt a message. Sender and receiver share a key. However, key must be sent down an internet connection - may get hacked. Encryption algorithm used to scramble data.
- 30Asymmetric EncryptionPublic key - 2 keys are used - one to encrypt and other to decrypt data. More secure as never have to reveal decryption key.
- 31Strong encryptionUseful lifetime of encrypted data is less than time to break code
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- Computer Science GCSE (Unit 6) Flashcards on Computer Science: Unit 6: Security, created by HRYN red on 22/01/2021.
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- HRYN red
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