How does a password system protect a computer system?

A password system only allows access to users who enter the correct password. The system can also lock an account after several wrong attempts.

What makes a strong password?

A strong password is long and mixes upper and lower case letters, numbers and symbols. A strong password avoids words and personal details that can be guessed.

What rules might a password system enforce?

A password system may require a minimum length and a mix of characters. The system may also block common passwords and limit failed attempts.

AQA GCSE Computer Science 8525

Algorithms

Topic overview Algorithms, decomposition and abstraction Pseudo-code, flowcharts and trace tables Efficiency of algorithms Linear search and binary search Bubble sort and merge sort

Programming

Topic overview Data types Variables, constants and assignment Sequence, selection and iteration Arithmetic, relational and Boolean operators Arrays and records Input, output, string handling and random numbers Subroutines and structured programming Validation, authentication and testing

Data Representation

Topic overview Number bases and why hexadecimal is used Converting between binary, decimal and hexadecimal Units of information: bits, bytes and prefixes Binary addition and binary shifts Character encoding: ASCII and Unicode Pixels, bitmaps and colour depth Bitmap image file size calculations Digital sound: sampling rate and sample resolution Data compression: Huffman coding and run-length encoding

Computer Systems

Topic overview Hardware, software and the operating system Logic gates, truth tables and Boolean expressions Programming languages and translators The CPU and the fetch-execute cycle Types of memory and embedded systems Secondary storage and cloud storage

Computer Networks

Topic overview Network types and topologies Wired and wireless networks Network protocols The TCP/IP model and its layers Network security methods

Cyber Security

Topic overview Cyber security, common threats and penetration testing Social engineering: blagging, phishing and shouldering Malware: viruses, trojans and spyware Methods to detect and prevent cyber security threats

Relational Databases and SQL

Topic overview Relational databases and keys SQL SELECT queries SQL INSERT, UPDATE and DELETE

Ethical, Legal and Environmental Impacts of Digital Technology

Topic overview Ethical issues in digital technology Legal issues, privacy and surveillance Environmental impacts of digital technology

Cyber Security

Methods to detect and prevent cyber security threats

3 things to know
Paper 2

Overview

Biometrics, strong passwords and password rules, CAPTCHA, email confirmation, automatic updates and two-factor authentication, and choosing the right measure for a stolen phone.

What you need to know

Answer each one before you reveal it.

Your recallNot started

Key term

What are biometric security measures?

Evaluation

What are the advantages of biometric security on mobile devices?

Evaluation

What are the disadvantages of biometric security?

Questions from this subtopic

Each one with the model answer underneath.

1
What are biometric security measures?
Model answer
Biometric measures identify a person by a physical feature such as a fingerprint, face or iris. Mobile phones often use fingerprint or face recognition.
2
What are the advantages of biometric security on mobile devices?
Model answer
Biometrics are quick to use and hard to copy or guess. A user cannot forget a fingerprint in the way they might forget a password.
3
What are the disadvantages of biometric security?
Model answer
Biometric readers can sometimes be fooled or fail to recognise the real user. A stolen biometric cannot be changed like a password.
4
How does a password system protect a computer system?
Model answer
A password system only allows access to users who enter the correct password. The system can also lock an account after several wrong attempts.
5
What makes a strong password?
Model answer
A strong password is long and mixes upper and lower case letters, numbers and symbols. A strong password avoids words and personal details that can be guessed.
6
What rules might a password system enforce?
Model answer
A password system may require a minimum length and a mix of characters. The system may also block common passwords and limit failed attempts.

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Algorithms

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