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

Passwords: salting, hashing, and key derivation

Cryptographie – Applications4 exercises

Why fast hashing is not enough

Short answerAdvanced

The name of the table of precomputed hashes

What the salt protects against

Open answerAdvanced

Slowness as a quality

Post-quantum cryptography

Cryptographie – Mathématiques4 exercises

What Shor breaks

Short answerAdvanced

AES-256 against Grover

The quantum-resistant foundation

Open answerAdvanced

Explaining "harvest now, decrypt later"

The blockchain: hashing, Merkle trees and proof of work

Cryptographie – Applications4 exercises

Why a blockchain is tamper-evident

Short answerAdvanced

The hash at the top of the tree

What makes proof of work secure

Open answerAdvanced

Why rewriting history is infeasible

One-way functions: the foundations

Cryptographie – Fondamentaux4 exercises

Recognizing a one-way function

Short answerAdvanced

The name of the secret

The consequences of P = NP

Open answerAdvanced

Unconditional versus computational

Kerckhoffs's principle and secure design

Cryptographie – Fondamentaux4 exercises

What does Kerckhoffs's principle say?

Short answerAdvanced

The only secret element

Why not create your own crypto?

Open answerAdvanced

The danger of obscurity as the sole foundation

Side-channel attacks

Cryptographie – Attaques4 exercises

What does a side-channel attack target?

Short answerAdvanced

The countermeasure to timing attacks

What power consumption and cache reveal

Open answerAdvanced

Proven secure, broken anyway