MCQs

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1. Which cipher is widely considered insecure in cloud computing due to its short key length of 56 bits?
   a. AES
   b. RSA
   c. DES
   d. ECC
   Answer: c. DEStestbook+1
2. Which algorithm is deprecated for SSL/TLS due to various vulnerabilities, including susceptibility to BEAST attacks?
   a. Blowfish
   b. RC4
   c. AES
   d. Twofish
   Answer: b. RC4satoricyber+1
3. Why should MD5 not be used in modern cryptographic authentication?
   a. Too slow
   b. Vulnerable to collisions
   c. Not an open standard
   d. Limited to 256 bits
   Answer: b. Vulnerable to collisionstestbook
4. What is the vulnerability associated with DES in cloud environments?
   a. Side-channel attack resistance
   b. Too large key size
   c. Susceptible to brute-force attacks
   d. High computing power
   Answer: c. Susceptible to brute-force attackssatoricyber+1
5. Why is SHA-1 avoided in modern cloud security protocols?
   a. Proprietary licensing
   b. Vulnerable to collision attacks
   c. Too resource-intensive
   d. Not supported by browsers
   Answer: b. Vulnerable to collision attackstestbook+1
6. Which cipher is known for weak key generation leading to insecure communication in WEP?
   a. RC2
   b. RC6
   c. RC4
   d. AES
   Answer: c. RC4satoricyber+1
7. Which property makes 3DES gradually phased out in cloud networks?
   a. Involves asymmetric encryption
   b. Large block size
   c. Still insufficient key length and block collision
   d. Open source limitations
   Answer: c. Still insufficient key length and block collisionsatoricyber
8. What cipher is most associated with the Sweet32 attack due to its 64-bit block size?
   a. AES
   b. Blowfish
   c. DES
   d. RC5
   Answer: c. DESsatoricyber
9. Which insecure cipher can be exploited in TLS protocol if not disabled?
   a. RC4
   b. AES
   c. Twofish
   d. ChaCha20
   Answer: a. RC4satoricyber
10. Why is Blowfish not recommended for new cloud deployments?
    a. Large overhead
    b. 64-bit block size vulnerability
    c. FIPS-certified only
    d. Not implemented in hardware
    Answer: b. 64-bit block size vulnerabilitysatoricyber
11. What major risk does using outdated ciphers in cloud APIs expose data to?
    a. Improved authentication
    b. Backward compatibility
    c. Data breaches
    d. Scalability issues
    Answer: c. Data breacheszscaler+1
12. Which encryption is especially vulnerable because the same key is reused?
    a. OTP
    b. AES
    c. Stream cipher (e.g., RC4 with key reuse)
    d. ECC
    Answer: c. Stream cipher (e.g., RC4 with key reuse)testbook
13. In cloud storage, which hash is obsolete due to both speed and collision risk?
    a. SHA-256
    b. SHA-3
    c. MD5
    d. SHA-384
    Answer: c. MD5zscaler+1
14. Disabling which cipher suite improves cloud TLS connection security?
    a. RSA+AES
    b. DES/3DES
    c. ChaCha20
    d. ECDHE
    Answer: b. DES/3DESsatoricyber
15. What is the cryptanalytic attack that renders Vigenère cipher insecure?
    a. Frequency analysis
    b. Padding oracle
    c. Brute-force with large key size
    d. Quantum annealing
    Answer: a. Frequency analysisincludehelp
16. What attack breaks WEP’s RC4-based security in Wi-Fi networks?
    a. Meet-in-the-middle
    b. Key reinstallation
    c. IV collision attack
    d. Padding oracle
    Answer: c. IV collision attacktestbook+1
17. Why should export-grade ciphers be disabled in cloud services?
    a. High performance
    b. Designed for quantum resistance
    c. Extremely weak by today’s computing
    d. Only support asymmetric encryption
    Answer: c. Extremely weak by today’s computingzscaler+1
18. Which insecure cipher did SSLv3 primarily rely on?
    a. RC2
    b. ChaCha
    c. RC4
    d. AES-GCM
    Answer: c. RC4satoricyber
19. Insecure hashing algorithm for file integrity check in cloud backups:
    a. SHA-512
    b. MD5
    c. HMAC
    d. AES
    Answer: b. MD5testbook
20. Weak ciphers leak information because they:
    a. Have too large key sizes
    b. Are always hardware accelerated
    c. Are vulnerable to known cryptanalytic attacks
    d. Require user input
    Answer: c. Are vulnerable to known cryptanalytic attackstestbook+1
21. Which stream cipher is banned in most secure cloud protocols?
    a. AES-CTR
    b. RC4
    c. Salsa20
    d. DES
    Answer: b. RC4satoricyber
22. Why is Twofish less likely to be considered insecure for cloud computing compared to DES?
    a. Hardware restriction
    b. Unproven resistance to attacks
    c. Larger key size and no known practical attacks
    d. 56-bit key size
    Answer: c. Larger key size and no known practical attackstestbook
23. What cipher vulnerability does BEAST attack exploit?
    a. ECB mode
    b. CBC mode in TLS
    c. OFB mode
    d. Counter mode
    Answer: b. CBC mode in TLStestbook+1
24. An insecure cipher can allow:
    a. Slower performance
    b. Eavesdropping and decryption
    c. Resource throttling
    d. Metadata hiding
    Answer: b. Eavesdropping and decryptiongeeksforgeeks+1
25. Blowfish is phased out because of:
    a. Key whitening
    b. Padding vulnerability
    c. Small block size
    d. Stream cipher nature
    Answer: c. Small block sizesatoricyber
26. Which is NOT a commonly cited insecure cipher in cloud environments?
    a. RC4
    b. DES
    c. MD5
    d. AES-256
    Answer: d. AES-256satoricyber
27. Ciphertext-only attack is easier against which type of ciphers?
    a. Secure ciphers
    b. Insecure legacy ciphers
    c. Post-quantum ciphers
    d. Stateful ciphers
    Answer: b. Insecure legacy ciphersincludehelp+1
28. For strong cloud data security, which ciphers must be avoided?
    a. AES with GCM
    b. SHA-256
    c. DES, RC4, and MD5
    d. ECDHE
    Answer: c. DES, RC4, and MD5testbook+1
29. Weak cipher suites impact cloud service:
    a. User experience only
    b. Data confidentiality
    c. Data archiving
    d. Storage capacity
    Answer: b. Data confidentialitygeeksforgeeks+1
30. Why are certain ciphers excluded from modern SSL/TLS implementations?
    a. Heavy computing power
    b. Security vulnerabilities
    c. Expensive hardware requirements
    d. Legal restrictions
    Answer: b. Security vulnerabilitiessatoricyber
31. Insecure ciphers:
    a. Are always symmetric
    b. Are immune to brute-force
    c. Are obsolete due to discovered attacks
    d. Do not require key exchange
    Answer: c. Are obsolete due to discovered attackstestbook+1
32. A primary feature that makes DES insecure:
    a. S-Boxes
    b. Short key length
    c. Non-linear permutations
    d. Multiple rounds
    Answer: b. Short key lengthtestbook+1
33. Vulnerability that renders RC2 useless in cloud security:
    a. ECB mode
    b. Small key size and limited rounds
    c. Too many rounds
    d. Unique IVs each time
    Answer: b. Small key size and limited roundssatoricyber
34. Cipher suite to avoid for compliance in clouds:
    a. TLS_RSA_WITH_AES_256_GCM
    b. TLS_RSA_WITH_RC4_128_MD5
    c. TLS_ECDHE_ECDSA_WITH_AES_128_GCM
    d. TLS_DHE_RSA_WITH_AES_256_CBC
    Answer: b. TLS_RSA_WITH_RC4_128_MD5satoricyber
35. Disabling insecure ciphers affects cloud:
    a. Vendor relationships
    b. Data protection compliance
    c. Data redundancy
    d. Compression ratio
    Answer: b. Data protection compliancegeeksforgeeks+1
36. Legacy cipher suite means:
    a. FIPS-certified
    b. Deprecated and vulnerable
    c. Patent-protected
    d. Hardware only
    Answer: b. Deprecated and vulnerabletestbook+1
37. What is the main risk of using SHA-1 in certificates for cloud APIs?
    a. High cost
    b. Susceptible to collision attacks
    c. No support for public keys
    d. Not available in libraries
    Answer: b. Susceptible to collision attackstestbook
38. Which property of RC4 is exploited in practical attacks like BitFlipping?
    a. Predictable keystream output
    b. Key size
    c. Block cipher mode
    d. Zeroized state
    Answer: a. Predictable keystream outputsatoricyber
39. MD5 hash is insecure for which of the following reason?
    a. Hardware acceleration
    b. Collision vulnerabilities
    c. Open specification
    d. 256-bit key only
    Answer: b. Collision vulnerabilitiestestbook
40. Critical impact of insecure ciphers on cloud communications:
    a. Insufficient bandwidth
    b. Encryption overhead
    c. Increased attack surface
    d. Limited support staff
    Answer: c. Increased attack surfacezscaler+1
41. Data breaches via deprecated ciphers are most likely during:
    a. Key exchange
    b. Secure storage only
    c. Cipher negotiation and weak fallback
    d. Hardware acceleration
    Answer: c. Cipher negotiation and weak fallbacksatoricyber
42. Sweet32 attack affects which algorithms?
    a. SHA-256
    b. DES and 3DES
    c. Twofish
    d. RSA
    Answer: b. DES and 3DESsatoricyber
43. What does PCI DSS compliance say about insecure ciphers?
    a. Mandatory usage
    b. Recommend for legacy app support
    c. Should be disabled
    d. Only allowed with hardware
    Answer: c. Should be disabledzscaler
44. Hashing with MD5 leads to:
    a. Secure resource sharing
    b. Collision and security risks
    c. Improved speed only
    d. Limited application
    Answer: b. Collision and security riskstestbook
45. Why is ECB block cipher mode avoided in secure cloud?
    a. Padding complexity
    b. Leaks data patterns
    c. Slow performance
    d. Too complex
    Answer: b. Leaks data patternstestbook
46. In which aspect does RC4 fail in cloud encryption?
    a. Key schedule weaknesses
    b. Authentication only
    c. Large block size
    d. Cannot encrypt byte streams
    Answer: a. Key schedule weaknessessatoricyber
47. Hash algorithms to avoid for file authentication in the cloud:
    a. SHA-3
    b. MD5 and SHA-1
    c. SHA-256
    d. SHA-384
    Answer: b. MD5 and SHA-1testbook
48. Why should weak ciphers be removed from cloud service configurations?
    a. Cost reduction
    b. Prevent vulnerability exploitation
    c. Hardware acceleration
    d. Increase user latency
    Answer: b. Prevent vulnerability exploitationzscaler+1
49. Insecure cryptosystem is defined by:
    a. Unsuitable for any application
    b. Easily breakable with practical attacks
    c. High compliance cost
    d. Implemented only in software
    Answer: b. Easily breakable with practical attackstestbook
50. Usage of insecure cipher suites can result in:
    a. Enhanced cryptographic performance
    b. Regulatory penalties and data loss
    c. Reduced user authentication steps
    d. Lower computational usage
    Answer: b. Regulatory penalties and data losszscaler+1

1. https://testbook.com/objective-questions/mcq-on-cryptography–5eea6a0939140f30f369d918
2. https://satoricyber.com/data-masking/data-encryption-top-7-algorithms-and-5-best-practices/
3. https://www.zscaler.com/resources/security-terms-glossary/what-is-cloud-encryption
4. https://www.geeksforgeeks.org/cloud-computing/an-overview-of-cloud-cryptography/
5. https://www.includehelp.com/cryptography/mcq-cryptography-ciphers-level-easy-2.aspx
6. https://www.sanfoundry.com/discrete-mathematics-questions-answers-cryptography-encryption/
7. https://www.sanfoundry.com/cryptography-mcqs/
8. https://www.scribd.com/document/826683138/INS-MCQ
9. https://itexamanswers.net/7-7-2-cloud-security-quiz-answers.html
10. https://www.studocu.com/in/document/anna-university/cloud-computing-cs8791/cns-1-mcq/13933355
11. https://www.splunk.com/en_us/blog/learn/data-encryption-methods-types.html
12. https://www.sanfoundry.com/1000-cyber-security-questions-answers/
13. https://www.techtarget.com/searchsecurity/definition/Quiz-Cryptography
14. https://www.sanfoundry.com/cyber-security-puzzles/
15. https://www.interviewbit.com/cyber-security-mcq/
16. http://www.arcserve.com/blog/5-common-encryption-algorithms-and-unbreakables-future
17. https://examradar.com/cloud-computing-and-security-challenges-mcqs/
18. https://examradar.com/cyber-security-mcq-set-12/
19. https://automationcommunity.com/100-mcqs-mastery-on-cybersecurity/
20. https://cozmocard.com/cryptography-and-network-security-mcq-questions-and-answers/3/