DGB 4: Using Encryption Software

← Digital Literacy – Year 4

Encryption transforms readable data into a protected form that can only be recovered with the appropriate key or secret. Students learn the purpose of encryption, practise with approved tools and understand that key management, passwords and backups are as important as the algorithm.

Curriculum reference

Area	Classification
Competence area	Action
Perspectives	T, I
Focus	Using software to encrypt data and understanding key management
Competence	Explain the basic purpose of encryption, distinguish symmetric and asymmetric approaches, and use approved tools to protect files or communication responsibly.

Learning objectives

Students can:

explain confidentiality as a purpose of encryption;
distinguish encryption from encoding and simple obfuscation;
describe symmetric and asymmetric encryption at a basic level;
use an approved encryption tool in a controlled exercise;
encrypt and decrypt a test file or folder;
explain how encryption protects data at rest and in transit;
handle passwords and keys carefully;
recognise common failures such as forgotten keys or unencrypted copies;
explain the role of HTTPS and encrypted messengers at a basic level;
consider legal, ethical and recovery implications;
identify everyday and professional uses of encryption.

Learning content

Basic idea of encryption

Encryption converts plaintext into ciphertext using a cryptographic algorithm and a key. Without the correct key, the protected content should be impractical to recover.

Symmetric and asymmetric encryption

Symmetric encryption uses the same secret key for encryption and decryption. Asymmetric cryptography uses a related public/private key pair and supports tasks such as secure key exchange and digital signatures.

Encryption software

Operating systems and trusted tools can encrypt files, folders or entire devices. Classroom exercises should use test data rather than sensitive personal information.

Files, folders and drives

Device or drive encryption protects stored data if a device is lost, while file-level encryption can protect selected content. Unencrypted temporary copies can still create risk.

Communication and cloud services

HTTPS protects web traffic in transit, while end-to-end encryption is designed so that only the communication endpoints can read message content. Cloud providers may offer different forms of encryption depending on the service.

Keys, passwords and recovery

Strong encryption cannot help if the password is weak or the key is exposed. Conversely, losing the only key can make legitimate data unrecoverable, so recovery planning matters.

Common errors

Examples include storing the password beside the encrypted file, sending the key through the same insecure channel, forgetting recovery information or assuming that deleting an unencrypted original securely removes every copy.

Legal and ethical aspects

Encryption protects privacy and legitimate confidential communication. Users must still follow school rules, law and ethical responsibilities regarding the content they store or share.

Everyday and professional use

Encryption is used in smartphones, online banking, company laptops, messaging, backups, password managers and secure administration.

Classroom activities

Secret or open

Classify example data by whether confidentiality is needed and justify the decision.

Expected outcome: A protection classification.

Set up an encryption tool

Use an approved classroom tool with test data and documented recovery information.

Expected outcome: A configured test environment.

Protect a file or folder

Encrypt, close, reopen and decrypt a test file successfully.

Expected outcome: A verified encryption exercise.

Secure a removable drive

Discuss or demonstrate appropriate protection for test removable media.

Expected outcome: A configuration record.

Symmetric or asymmetric

Match scenarios to the most suitable conceptual approach.

Expected outcome: A comparison table.

Simulate a secure message

Model public/private key roles using classroom tokens or prepared examples.

Expected outcome: A conceptual simulation.

Manage passwords and keys

Design a safe key-storage and recovery plan.

Expected outcome: A key-management checklist.

Troubleshoot encryption

Analyse cases involving lost passwords, wrong keys or unencrypted copies.

Expected outcome: A fault analysis.

Compare cloud and messenger protection

Distinguish transport encryption, storage encryption and end-to-end encryption.

Expected outcome: A protection-layer table.

Everyday and work reflection

Identify where encryption is already used in daily digital services.

Expected outcome: A practical-use map.

Self-check

I can explain what encryption protects.
I can distinguish symmetric and asymmetric encryption conceptually.
I can use an approved tool on test data.
I understand that keys and passwords require careful management.
I can distinguish data at rest from data in transit.
I can explain why recovery planning matters.