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Which protocol is used to transmit encrypted authentication information in key-based cloud authentication?
a. SSL/TLS
b. SMTP
c. FTP
d. DHCP
Answer: a. SSL/TLSsanfoundry
What is the purpose of a Public Key Infrastructure (PKI) in cloud authentication?
a. Managing storage
b. Generating public/private keys
c. Issuing digital certificates
d. Both b and c
Answer: d. Both b and cscribd
Which cryptographic algorithm is most commonly used for key-based authentication in cloud environments?
a. DES
b. AES
c. RSA
d. CBC
Answer: c. RSAsanfoundry
What does SSH use to authenticate users and systems in cloud servers?
a. Passwords only
b. Biometric keys
c. Public and private key pairs
d. OTPs
Answer: c. Public and private key pairssanfoundry
Which of the following is not a public key distribution method?
a. Public-Key Certificates
b. Hashing Certificates
c. Publicly available directories
d. Public-Key authority
Answer: b. Hashing Certificatessanfoundry
Which phrase describes asymmetric cryptography in cloud authentication?
a. Sharing the same key for encryption and decryption
b. Different keys for encryption and decryption
c. Physical key devices
d. Keyless authentication
Answer: b. Different keys for encryption and decryptionsanfoundry
What is the primary advantage of public key authentication over password-based authentication in cloud?
a. Easier to remember
b. Resistance to brute-force attacks
c. No key management required
d. Cost-effective
Answer: b. Resistance to brute-force attackssanfoundry
Which format is most commonly used for storing public keys in cloud PKI?
a. PEM
b. TXT
c. JPEG
d. MP4
Answer: a. PEMsanfoundry
What does a digital certificate validate in key-based authentication?
a. Ownership of the corresponding private key
b. File integrity
c. Physical identity
d. Hardware compatibility
Answer: a. Ownership of the corresponding private keyscribd
Which entity issues digital certificates in a cloud PKI environment?
a. Internet Service Provider
b. Certificate Authority (CA)
c. Cloud customer
d. Network Admin
Answer: b. Certificate Authority (CA)scribd
Which protocol exchange is used for key-based mutual authentication between cloud components?
a. HTTP
b. SAML
c. SSL Handshake
d. POP3
Answer: c. SSL Handshakesanfoundry
What is required to verify the authenticity of a user’s key in cloud authentication?
a. Password reset
b. CA signature
c. Hardware token
d. Image scan
Answer: b. CA signaturescribd
Which cloud service model most commonly leverages SSH key-based authentication?
a. SaaS
b. IaaS
c. PaaS
d. BaaS
Answer: b. IaaSsanfoundry
What does the acronym PKI stand for?
a. Private Knowledge Implementation
b. Public Key Infrastructure
c. Password Key Integration
d. Public Knowledge Interface
Answer: b. Public Key Infrastructurescribd
Which of the following is not a component of PKI?
a. Registration Authority
b. Certificate Authority
c. User Database
d. Centralized Key Vault
Answer: c. User Databasescribd
Which attack is mitigated by using SSH key-based authentication?
a. Phishing
b. Brute-force password attacks
c. Denial of Service
d. SQL Injection
Answer: b. Brute-force password attackssanfoundry
What type of key does a user store locally for SSH authentication in cloud?
a. Private key
b. Public key
c. Session key
d. Shared key
Answer: a. Private keysanfoundry
In SSH, where is the user’s public key stored for key-based authentication?
a. On user device only
b. Cloud server’s authorized_keys file
c. Web browser cache
d. Cloud dashboard
Answer: b. Cloud server’s authorized_keys filesanfoundry
Which is a challenge in managing keys for large cloud environments?
a. High cost of storage
b. Scalability and revocation
c. Hardware upgrades
d. Network latency
Answer: b. Scalability and revocationscribd
What does SAML provide in key-based single sign-on systems for cloud?
a. Authorization tokens
b. Secure session keys
c. Authentication assertions
d. Network protocols
Answer: c. Authentication assertionssanfoundry
Which standard is key to creating SSO systems in cloud environments?
a. OpenID
b. OAuth
c. CHAP
d. X.500
Answer: a. OpenIDsanfoundry
In key-based authentication, what enables revocation of a compromised certificate?
a. CRL (Certificate Revocation List)
b. SSL
c. Hashing
d. SHA-256
Answer: a. CRL (Certificate Revocation List)scribd
What does the private key in asymmetric cryptography allow the owner to perform?
a. Encrypt data, create digital signatures
b. Share files
c. Request certificate renewal
d. None of the above
Answer: a. Encrypt data, create digital signaturessanfoundry
Which protocol is used for distributing X.509 certificates in cloud PKI?
a. LDAP
b. FTP
c. SMTP
d. SFTP
Answer: a. LDAPsanfoundry
Which option describes the function of a key pair in SSH-based authentication?
a. Only for encryption
b. Verifies user identity
c. For backup
d. For hashing
Answer: b. Verifies user identitysanfoundry
What is the signature process in key-based authentication?
a. Hashing a document
b. Encrypting a hash with private key
c. Uploading public key
d. Sending OTP
Answer: b. Encrypting a hash with private keysanfoundry
Which option is NOT part of the key lifecycle in cloud key management?
a. Generation
b. Storage
c. Deletion
d. Decryption
Answer: d. Decryptionscribd
What does OpenSSH use to generate and manage authentication keys?
a. ssh-keygen
b. keyvault-cli
c. passwd
d. cloudmod
Answer: a. ssh-keygensanfoundry
What is meant by “key rotation” in cloud environments?
a. Changing user passwords
b. Periodic replacement of cryptographic keys
c. Rebooting key server
d. Revoking user access
Answer: b. Periodic replacement of cryptographic keysscribd
What is the primary role of a CA in PKI-based authentication?
a. Store confidential files
b. Issue, revoke, and validate certificates
c. Generate user passwords
d. Monitor usage logs
Answer: b. Issue, revoke, and validate certificatesscribd
Which option is MOST secure for authenticating remote users in a public cloud?
a. Passwords
b. OTPs
c. Public key cryptography
d. Biometric scan
Answer: c. Public key cryptographysanfoundry
Which underlying principle does TLS rely on for secure connections?
a. Symmetric encryption only
b. Authentication using digital certificates
c. File hashing
d. Keyless exchanges
Answer: b. Authentication using digital certificatessanfoundry
Which statement about private keys is true in key-based authentication?
a. Private keys must not be shared
b. Private keys are transmitted across the network
c. Private keys are stored in certificate directories
d. Private keys are only used for hashing
Answer: a. Private keys must not be sharedsanfoundry
Which entity verifies a digital signature in cloud key-based exchanges?
a. Cloud user
b. Public Key owner
c. Certificate Authority
d. Anyone with the public key
Answer: d. Anyone with the public keyscribd
What is the use of fingerprint in an SSH key?
a. Identify server version
b. Verify key identity
c. Measure server load
d. Encrypt traffic
Answer: b. Verify key identitysanfoundry
In key-based authentication, what is typically required for system login?
a. Password
b. Private key
c. OTP
d. Captcha
Answer: b. Private keysanfoundry
What role does hashing play in digital signatures?
a. Secures the private key
b. Generates a code for verification
c. Converts data to fixed-length value, secured by the private key
d. Signs after encryption
Answer: c. Converts data to fixed-length value, secured by the private keysanfoundry
Why are public keys “public” in PKI?
a. Anyone can use them to verify identities
b. They encrypt network traffic
c. They are stored on user devices only
d. For password management
Answer: a. Anyone can use them to verify identitiessanfoundry
What does the term “SSH key fingerprint” refer to?
a. User credentials
b. Hash of the public key
c. Cloud server details
d. Application log ID
Answer: b. Hash of the public keysanfoundry
Which method prevents “man-in-the-middle” attacks in key-based authentication?
a. Strong passwords
b. Digital certificate chain validation
c. Username complexity
d. Increased network speed
Answer: b. Digital certificate chain validationscribd
What information does an X.509 certificate contain?
a. Certificate holder’s public key
b. Validity period
c. Issuer information
d. All of the above
Answer: d. All of the abovesanfoundry
Which type of attack does key-based authentication NOT directly address?
a. Phishing
b. Replay attacks
c. Password eavesdropping
d. SQL injection
Answer: d. SQL injectionsanfoundry
What is the recommended key length for RSA keys in modern cloud authentication?
a. 512 bits
b. 1024 bits
c. 2048 bits
d. 4096 bits
Answer: c. 2048 bitssanfoundry
What is a key vault in cloud environments?
a. Hardware module
b. Secure repository for cryptographic keys
c. Network device
d. Key generator software
Answer: b. Secure repository for cryptographic keysscribd
In PKI, who is responsible for maintaining the trust model?
a. End user
b. Certificate Authority
c. PKI administrator
d. Cloud customer
Answer: b. Certificate Authorityscribd
Which protocol uses asymmetric keys to secure email communications in cloud environments?
a. SMTP
b. S/MIME
c. POP3
d. IMAP
Answer: b. S/MIMEsanfoundry
Which is NOT an authentication factor in key-based authentication?
a. Something you have (private key)
b. Something you know (password)
c. Something you are (biometrics)
d. None of the above
Answer: c. Something you are (biometrics)sanfoundry
What does “key escrow” mean in cloud PKI?
a. Password backup
b. Third-party storage of cryptographic keys
c. Key rotation
d. Firewall protection
Answer: b. Third-party storage of cryptographic keysscribd
What is the usage of challenge–response in key-based authentication?
a. Verify possession of the private key
b. Request password change
c. Update public keys
d. Authenticate network traffic
Answer: a. Verify possession of the private keysanfoundry
What is “certificate chaining” in PKI systems?
a. Linking hardware devices
b. Chaining multiple certificates to establish trust from user to root CA
c. Issuing intermediate keys
d. Rotating user passwords
Answer: b. Chaining multiple certificates to establish trust from user to root CAscribd

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