Cryptography and Computer Security

Question 1

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

Possible answers:

RSA
Blowfish
AES
DES

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?

Possible answers:

MD5
SHA-256
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?

Possible answers:

SMTP
FTP
TLS
SSH

Answer

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

Question 4

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

Possible answers:

Phishing
DDoS
SQL Injection
Man-in-the-middle

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?

Possible answers:

3DES
AES
RC4
DES

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?

Possible answers:

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

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?

Possible answers:

Symmetric cryptography
Hash functions
Steganography
Asymmetric cryptography

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?

Possible answers:

Diffie-Hellman
HTTPS
OAuth
Kerberos

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?

Possible answers:

Encryption
Compression
Padding
Salting

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?

Possible answers:

Rootkit
Exploit
Backdoor
Zero-day

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?

Possible answers:

EdDSA
RSA
ECDSA
DSA

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?

Possible answers:

ECB
GCM
CTR
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?

Possible answers:

DNS
RADIUS
PKI
LDAP

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?

Possible answers:

Rainbow table
Brute force
Social engineering
Dictionary attack

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?

Possible answers:

X.509
S/MIME
PKCS#12
PGP

Answer

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

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The 15 quiz questions

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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