SLR09 Compression, Encryption and Hashing

Specification Points

1.3.1a Lossy vs Lossless compression
1.3.1b Run length encoding and dictionary coding for lossless compression
1.3.1c Symmetric and asymmetric encryption
1.3.1d Different uses of hashing

Student Learning Record

Exam Questions

SLR9 (A ONLY) - Compression, encryption and hashing

Compression_Encryption_and_Hashing.pdf

9.1 (A-Level) Lossy and Lossless

Supporting Video(s)

Learning Objectives

Understand what is meant by and the need for compression techniques
Compare methods of lossy and lossless compression
Provide examples of where lossy or lossless compression would be more appropriate

Lesson Resources

Additional Links

Online audio spectrum analysis

9.2 (A-Level) Run-Length Encoding

Supporting Video(s)

Learning Objectives

Lesson Resources

Additional Links

9.3 (A-Level) Symmetric and Asymmetric Encryption

Supporting Video(s)

Learning Objectives

Lesson Resources

Additional Links

9.4 (A-Level) Different Uses of Hashing

Supporting Video(s)

Learning Objectives

Understand what is meant by and the use for hashing
Explain why it is necessary to salt hashes
Describe the difference between hashing and encrypting

Lesson Resources

Additional Links

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