Cryptography and Computer Security

Question 1

Question 1 : Which asymmetric encryption algorithm is based on the factorization of large prime numbers?

Réponses possibles :

RSA
AES
DES
Blowfish

Answer

RSA (Rivest-Shamir-Adleman) is based on the difficulty of factoring the product of two large prime numbers.

Question 2

Question 2 : Which cryptographic hash function has been compromised and is now considered insecure?

Réponses possibles :

SHA-256
MD5
SHA-3
bcrypt

Answer

MD5 and SHA-1 are considered vulnerable to collisions. MD5 was the first to be widely compromised.

Question 3

Question 3 : Which protocol ensures HTTPS communication encryption?

Réponses possibles :

FTP

Question 4

Question 4 : Which attack exploits flaws in user input validation to execute malicious code?

Réponses possibles :

DDoS
Phishing
Man-in-the-middle
SQL Injection

Answer

SQL injection allows executing malicious queries by exploiting poor user input validation.

Question 5

Question 5 : Which symmetric encryption standard uses 128-bit blocks and 128, 192, or 256-bit keys?

Réponses possibles :

AES
DES
3DES
RC4

Answer

AES (Advanced Encryption Standard) is the symmetric encryption standard adopted by NIST in 2001.

Question 6

Question 6 : Which cryptographic concept allows proving knowledge of a secret without revealing it?

Réponses possibles :

Digital signature
Zero-Knowledge Proof
X.509 Certificate
JWT Token

Answer

Zero-Knowledge Proofs allow proving a statement without revealing the underlying information.

Question 7

Question 7 : Which type of cryptography is threatened by future quantum computers?

Réponses possibles :

Symmetric cryptography
Hash functions
Asymmetric cryptography
Steganography

Answer

Asymmetric cryptography (RSA, ECC) is vulnerable to Shor's algorithm on quantum computers.

Question 8

Question 8 : Which protocol allows secure key exchange over an insecure channel?

Réponses possibles :

HTTPS
OAuth
Kerberos
Diffie-Hellman

Answer

Diffie-Hellman key exchange allows two parties to create a shared secret key over a public channel.

Question 9

Question 9 : Which technique involves adding random data before hashing a password?

Réponses possibles :

Salting
Padding
Encryption
Compression

Answer

Salting adds random data to passwords before hashing to counter rainbow table attacks.

Question 10

Question 10 : What term describes a security flaw unknown to the vendor and unpatched?

Réponses possibles :

Backdoor
Zero-day
Exploit
Rootkit

Answer

A zero-day vulnerability is a flaw unknown to the vendor, with no patch available when exploited.

Question 11

Question 11 : Which elliptic curve algorithm is used in Bitcoin for signatures?

Réponses possibles :

RSA
DSA
ECDSA
EdDSA

Answer

ECDSA (Elliptic Curve Digital Signature Algorithm) with the secp256k1 curve is used to sign Bitcoin transactions.

Question 12

Question 12 : Which block cipher mode uses an initialization vector and chains blocks?

Réponses possibles :

ECB
CTR
GCM
CBC

Answer

CBC (Cipher Block Chaining) mode XORs each plaintext block with the previous ciphertext block before encryption.

Question 13

Question 13 : Which infrastructure manages digital certificates and certificate authorities?

Réponses possibles :

PKI
DNS
LDAP
RADIUS

Answer

PKI (Public Key Infrastructure) is the set of components that manage digital certificates and trust.

Question 14

Question 14 : Which type of attack tries all possible combinations to find a password?

Réponses possibles :

Dictionary attack
Brute force
Rainbow table
Social engineering

Answer

Brute force attacks systematically try all possible combinations until finding the correct password.

Question 15

Question 15 : Which standard defines the format of digital certificates used on the Internet?

Réponses possibles :

PGP
S/MIME
X.509
PKCS#12

Answer

X.509 is the ITU-T standard that defines the format of public key certificates used in TLS/SSL and other protocols.

Accepted Answer

TLS (Transport Layer Security), successor to SSL, is the protocol that secures HTTPS connections.

Question 4 : Which attack exploits flaws in user input validation to execute malicious code?

Question 5 : Which symmetric encryption standard uses 128-bit blocks and 128, 192, or 256-bit keys?

Question 6 : Which cryptographic concept allows proving knowledge of a secret without revealing it?

Question 7 : Which type of cryptography is threatened by future quantum computers?

Question 8 : Which protocol allows secure key exchange over an insecure channel?

Question 9 : Which technique involves adding random data before hashing a password?

Question 10 : What term describes a security flaw unknown to the vendor and unpatched?

Question 11 : Which elliptic curve algorithm is used in Bitcoin for signatures?

Question 12 : Which block cipher mode uses an initialization vector and chains blocks?

Question 13 : Which infrastructure manages digital certificates and certificate authorities?

Question 14 : Which type of attack tries all possible combinations to find a password?

Question 15 : Which standard defines the format of digital certificates used on the Internet?

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Les 15 questions du quiz

Question 1 : Which asymmetric encryption algorithm is based on the factorization of large prime numbers?

Question 2 : Which cryptographic hash function has been compromised and is now considered insecure?

Question 3 : Which protocol ensures HTTPS communication encryption?

Question 4 : Which attack exploits flaws in user input validation to execute malicious code?

Question 5 : Which symmetric encryption standard uses 128-bit blocks and 128, 192, or 256-bit keys?

Question 6 : Which cryptographic concept allows proving knowledge of a secret without revealing it?

Question 7 : Which type of cryptography is threatened by future quantum computers?

Question 8 : Which protocol allows secure key exchange over an insecure channel?

Question 9 : Which technique involves adding random data before hashing a password?

Question 10 : What term describes a security flaw unknown to the vendor and unpatched?

Question 11 : Which elliptic curve algorithm is used in Bitcoin for signatures?

Question 12 : Which block cipher mode uses an initialization vector and chains blocks?

Question 13 : Which infrastructure manages digital certificates and certificate authorities?

Question 14 : Which type of attack tries all possible combinations to find a password?

Question 15 : Which standard defines the format of digital certificates used on the Internet?

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True or False: Technology

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₿ Cryptocurrencies & Blockchain