(ISC)2 Certified in Cybersecurity Practice Exam

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How many keys are needed for two people to conduct a confidential conversation using asymmetric communication?

  1. 1

  2. 4

  3. 8

  4. 11

The correct answer is: 4

To facilitate a confidential conversation using asymmetric communication, each participant requires a pair of keys: a public key and a private key. In asymmetric encryption, the public key is used to encrypt a message, and only the corresponding private key can decrypt it. When considering two individuals in a confidential exchange, each person needs their own pair of keys. Therefore, you would have: - Person A needs a public and a private key (2 keys) - Person B needs a public and a private key (2 keys) Adding these together, you get a total of 4 keys (2 keys for each participant). The two pairs of keys enable secure communications where one person's public key can be used by the other to encrypt messages, and only the intended recipient can decrypt them using their private key. The correct choice reflects the requirement of having four distinct keys for secure communication when asymmetric encryption is employed for two individuals.