Year 12 · QCE / Digital Solutions
Flashcards and recall.
Make a short deck from material you need to recall without notes.
Try this with Digital Solutions
- Write one prompt per card. Use definitions, explanations or examples from your current topic.
- Answer aloud before turning the card. Split a card if it asks for several unrelated facts.
- Set aside missed cards and revisit them in a later session.
Recall topics
- What is symmetric encryption?
- What is the key-distribution problem of symmetric encryption?
- State the block size and effective key length of DES.
- Why is DES no longer considered secure?
- How does Triple DES work?
- What is the main drawback of Triple DES compared with AES?
- State the block size and key lengths of AES.
- Why is AES the most widely used symmetric algorithm?
- State the block size and key range of Blowfish.
- What is a limitation of Blowfish?
- State the block size and key lengths of Twofish.
- Name the five symmetric algorithms listed in the Digital Solutions syllabus.
- What is asymmetric encryption?
- On what mathematical problem does RSA's security depend?
- To send a confidential message with RSA, which key encrypts it?
- How is an RSA digital signature created and checked?
- Why is RSA usually combined with a symmetric algorithm?
- What RSA key length is generally regarded as a current minimum?
- How does a Caesar cipher encrypt a letter?
- How many useful keys does a Caesar cipher have?
- Why does a Caesar cipher fall to frequency analysis?
- How does a Vigenère cipher work?
- What is the key space of a Vigenère cipher with an n-letter key?
- What is the main weakness of the Vigenère cipher?
- How does a Gronsfeld cipher differ from Vigenère?
- Encrypt HI with the Gronsfeld key 31.
- What is the key space of a Gronsfeld cipher with an n-digit key?
- What is a one-time pad?
- Why is reusing a one-time pad dangerous?
- What is the practical drawback of a one-time pad?
- What is meant by brute-force attack?
- What does MOD 26 do in cipher algorithms?
- What is hashing?
- Give three uses of hashing in data exchange.
- What is a salt in password hashing?
- What is the avalanche effect?
- Name two hashing algorithms and their output sizes.
- What is a checksum?
- How does a checksum differ from a cryptographic hash?
- What is lossless compression?
Resource inventory inspected 4 November 2026. The main ATARMAXXING study platform is separate from tutoring. Topic labels show what was found, not a guarantee of complete curriculum coverage or tutor availability.
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