Exercises

Every exercise from the courses, in one place. Search for a specific one, filter by subject, or let chance pick one for you.

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Flash questionsShort drills on core skills, as cards to project or print.See the series

1120 exercises

MAC and HMAC: authenticating messages

Cryptographie – Intégrité4 exercises

What a MAC adds to hashing

Short answerAdvanced

The missing property

HMAC rather than Hash(key || message)

Open answerAdvanced

Timing attack on comparison

Elliptic curve cryptography

Cryptographie – Clé publique4 exercises

The difficulty of the ECDLP

Short answerAdvanced

The equation of an elliptic curve

The advantage of elliptic curves

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The ECDSA nonce

Shamir's Secret Sharing

Cryptographie – Protocoles4 exercises

The number of shares needed

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The threshold of a parabola

What k-1 shares guarantee

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Why modular arithmetic

Zero-Knowledge Proofs

Cryptographie – Protocoles4 exercises

Identifying the right property

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The probability after ten rounds

A real use of zero-knowledge proofs

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Repetition and soundness

Passwords: salting, hashing, and key derivation

Cryptographie – Applications4 exercises

Why fast hashing is not enough

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The name of the table of precomputed hashes

What the salt protects against

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Slowness as a quality

Post-quantum cryptography

Cryptographie – Mathématiques4 exercises

What Shor breaks

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AES-256 against Grover

The quantum-resistant foundation

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Explaining "harvest now, decrypt later"