Public and Private Keys MCQs

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1. : What is the main purpose of a public key in cryptography?





2. : What is the main purpose of a private key?





3. : Public and private keys are used in which type of cryptography?





4. : Which algorithm commonly uses public and private keys?





5. : In a public key system, who has access to the public key?





6. : What should always remain secret in a publicā€“private key pair?





7. : Which key is used to create a digital signature?





8. : Which key is used to verify a digital signature?





9. : Publicā€“private key cryptography is also called?





10. : What mathematical principle makes RSA secure?





11. : In asymmetric encryption, what does the sender use to encrypt the message?





12. : In asymmetric encryption, what does the receiver use to decrypt the message?





13. : Which is an example of an asymmetric algorithm?





14. : Which is NOT a use of publicā€“private key pairs?





15. : What is a key pair in public-key cryptography?





16. : Which organization issues digital certificates linking public keys to identities?





17. : If Alice encrypts a message with Bobā€™s public key, who can decrypt it?





18. : Which key is used in SSL/TLS for identity verification?





19. : Which algorithm is used for digital signatures in Bitcoin?





20. : What does ECDSA stand for?





21. : Which is a benefit of public-key cryptography?





22. : Which is a drawback of publicā€“private key systems compared to symmetric?





23. : What is the typical key length of RSA for secure communication today?





24. : Which key is stored in digital wallets for cryptocurrency transactions?





25. : What is derived from the private key in cryptocurrencies?





26. : If a private key is lost in cryptocurrency, what happens?





27. : Which asymmetric algorithm is faster with shorter keys?





28. : In PGP, what is the role of the public key?





29. : Which type of cryptography uses both symmetric and asymmetric together?





30. : Which public key algorithm is based on elliptic curve mathematics?





31. : In digital signature process, what key does the verifier use?





32. : What ensures that a private key corresponds uniquely to its public key?





33. : Which key exchange algorithm uses publicā€“private pairs?





34. : What is a risk if a private key is exposed?





35. : Which is used for secure email communication?





36. : What is the function of a Key Pair Generator?





37. : In asymmetric encryption, if a message is signed with a private key, what proves authenticity?





38. : Which cryptographic system forms the backbone of SSL certificates?





39. : What is a Key Management System (KMS) used for?





40. : Which type of key can be freely shared without security risks?





41. : Which protocol relies on publicā€“private key pairs for secure browsing?





42. : Which format is often used to store private keys securely?





43. : Which is the biggest challenge in asymmetric cryptography?





44. : Which algorithm is used in SSH for secure login?





45. : Which key is used by sender to encrypt a symmetric session key in hybrid cryptography?





46. : What ensures data integrity in digital signatures?





47. : Which algorithm is considered more efficient than RSA?





48. : What is the primary function of a private key in blockchain wallets?





49. : Which ensures authenticity of a public key?





50. : Which process allows secure message exchange using publicā€“private keys?





51. : What is the main purpose of a private key?





52. : Public and private keys are used in which type of cryptography?





53. : Which algorithm commonly uses public and private keys?





54. : In a public key system, who has access to the public key?





55. : What should always remain secret in a publicā€“private key pair?





56. : Which key is used to create a digital signature?





57. : Which key is used to verify a digital signature?





58. : Publicā€“private key cryptography is also called?





59. : What mathematical principle makes RSA secure?





60. : In asymmetric encryption, what does the sender use to encrypt the message?





61. : In asymmetric encryption, what does the receiver use to decrypt the message?





62. : Which is an example of an asymmetric algorithm?





63. : Which is NOT a use of publicā€“private key pairs?





64. : What is a key pair in public-key cryptography?





65. : Which organization issues digital certificates linking public keys to identities?





66. : If Alice encrypts a message with Bobā€™s public key, who can decrypt it?





67. : Which key is used in SSL/TLS for identity verification?





68. : Which algorithm is used for digital signatures in Bitcoin?





69. : What does ECDSA stand for?





70. : Which is a benefit of public-key cryptography?





71. : Which is a drawback of publicā€“private key systems compared to symmetric?





72. : What is the typical key length of RSA for secure communication today?





73. : Which key is stored in digital wallets for cryptocurrency transactions?





74. : What is derived from the private key in cryptocurrencies?





75. : If a private key is lost in cryptocurrency, what happens?





76. : Which asymmetric algorithm is faster with shorter keys?





77. : In PGP, what is the role of the public key?





78. : Which type of cryptography uses both symmetric and asymmetric together?





79. : Which public key algorithm is based on elliptic curve mathematics?





80. : In digital signature process, what key does the verifier use?





81. : What ensures that a private key corresponds uniquely to its public key?





82. : Which key exchange algorithm uses publicā€“private pairs?





83. : What is a risk if a private key is exposed?





84. : Which is used for secure email communication?





85. : What is the function of a Key Pair Generator?





86. : In asymmetric encryption, if a message is signed with a private key, what proves authenticity?





87. : Which cryptographic system forms the backbone of SSL certificates?





88. : What is a Key Management System (KMS) used for?





89. : Which type of key can be freely shared without security risks?





90. : Which protocol relies on publicā€“private key pairs for secure browsing?





91. : Which format is often used to store private keys securely?





92. : Which is the biggest challenge in asymmetric cryptography?





93. : Which algorithm is used in SSH for secure login?





94. : Which key is used by sender to encrypt a symmetric session key in hybrid cryptography?





95. : What ensures data integrity in digital signatures?





96. : Which algorithm is considered more efficient than RSA?





97. : What is the primary function of a private key in blockchain wallets?





98. : Which ensures authenticity of a public key?





99. : Which process allows secure message exchange using publicā€“private keys?





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