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

Attacks on RSA

Cryptographie – Attaques4 exercises

The flaw of textbook RSA

Short answerAdvanced

The safe padding

Recognising the attack and its cause

Open answerAdvanced

Why deterministic RSA is dangerous

Quantum key distribution (BB84)

Cryptographie – Quantique4 exercises

The physical foundation of BB84

Short answerAdvanced

What is kept after reconciliation?

How to detect an eavesdropper

Open answerAdvanced

QKD versus post-quantum cryptography

Homomorphic encryption

Cryptographie – Avancée4 exercises

What homomorphic encryption enables

Short answerAdvanced

Paillier's operation

What FHE adds

Open answerAdvanced

A concrete use case

Secure multiparty computation

Cryptographie – Protocoles4 exercises

What MPC guarantees

Short answerAdvanced

The founding problem of MPC

Semi-honest or malicious?

Open answerAdvanced

A real-world use case of MPC

Signal: forward secrecy and the double ratchet

Cryptographie – Messagerie4 exercises

What forward secrecy guarantees

Short answerAdvanced

The key action of forward secrecy

The role of each ratchet

Open answerAdvanced

Why erasing protects even a stolen phone

Strong authentication: TOTP and FIDO2

Cryptographie – Applications4 exercises

TOTP versus HOTP

Short answerAdvanced

The cryptographic core of HOTP and TOTP

Why FIDO2 resists phishing

Open answerAdvanced

TOTP is phishable, FIDO2 is not