Boolean Logic and Cybersecurity

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infoWhy this? Connecting Boolean logic with hardware, program decisions, and cyber defence shows how precise logical rules operate across computing. Understanding threats, authentication, authorisation, encryption, hashing, and incident response enables us to select and justify layered security controls.

scheduleWhy now? Near the end of KS3, this unit consolidates learning about online safety, computer systems, programming, encryption, and networks. Its truth tables, Boolean expressions, and security reasoning also provide an immediate foundation for the control-system modelling that follows.

Boolean values are either True or False.
AND is true only when both inputs are true.
OR is true when at least one input is true.
NOT inverts a Boolean value.
Truth tables list all possible input combinations and outputs.
Logic gates are hardware implementations of Boolean operations.
Boolean expressions and logic circuits are equivalent representations of the same rules.
Cyber threats include malware and social engineering attacks.
Phishing attacks impersonate a trusted source to induce actions such as revealing information, visiting a malicious site, opening an attachment, or transferring money, and urgency is a common but not universal tactic.
Authentication checks who a user is (e.g., password/MFA), while authorisation checks what they are allowed to access (permissions/roles).
Hashing is a one-way process used to compare password hashes and check data integrity.
Encryption is reversible with the correct key and is used primarily to protect the confidentiality of data in storage or transit.
Salting adds a unique, random value to a password before hashing to protect against precomputed password attacks.
Multi-factor authentication reduces account-takeover risk.
Security patching addresses known software vulnerabilities.
Incident response commonly includes identify, contain, eradicate, recover, and review stages.
Least privilege limits damage from compromised accounts by reducing what accounts can access.
Suspected cyber incidents should be reported promptly through agreed channels while preserving key evidence.

rocket_launchYou must be able to

Construct and interpret truth tables for simple logical expressions.
Translate between Boolean expressions and simple/compound gate circuits.
Identify realistic cyber threats and propose layered controls, linking controls to authentication/authorisation and encryption/hashing where appropriate.
Apply incident-response stages to a scenario with justified actions.
Decide immediate safe actions and reporting steps for a suspected cyber incident.

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