It includes:
- Student Learning Record (A3 version in word)
- Student Learning Record (PDF version)
- Student Learning Record (PowerPoint version)
- Set of student activities and workshops with answers
- Answers to the exam questions from the back of the SLR
- Teacher Marking Checklist
This topic covers:
H446
- 1.3.1 a-d Compression, Encryption and Hashing
Specific knowledge required for A Level:
- Candidates need to understand the need for compression, especially when transferring data via the
Internet. - Candidates need to understand the difference between lossy and lossless compression, and the benefits and drawbacks of each type.
- Candidates need to be able to recommend a type of compression for a given scenario.
- Candidates need to understand how run-length encoding can reduce the size of a file for example with a text file or image.
- Candidates should understand how dictionary coding works by substituting entries with a unique code.
- Candidates should have practical experience of using these algorithms with small example files.
- Candidates should understand the need for encryption. Candidates should understand how symmetric and asymmetric encryption work to encrypt and decrypt data.
- Candidates should understand the need for and purpose of using hashing algorithms to store data.
- Candidates should be aware of different uses for hashing, such as the storing of passwords.
