(ISC)2 Certified in Cybersecurity Practice Exam

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What is the purpose of a security key exchange protocol?

  1. A method for exchanging encryption keys securely

  2. A protocol for managing user permissions

  3. A system for logging security events

  4. A format for reporting security incidents

The correct answer is: A method for exchanging encryption keys securely

The purpose of a security key exchange protocol is to establish a secure method for exchanging encryption keys between parties. This is critical in ensuring that sensitive information can be transmitted securely over potentially insecure channels, such as the internet. By using a key exchange protocol, parties can agree on a shared secret key that can then be utilized for encrypting their communications. Key exchange protocols, such as Diffie-Hellman, facilitate the secure negotiation of cryptographic keys without the need to transmit the key itself, which would be vulnerable to interception. This method not only assures confidentiality, but also enables authentication and non-repudiation, ensuring that the keys are exchanged between legitimate parties. The other options, while addressing various aspects of security, do not pertain to the specific function of a key exchange protocol. For example, managing user permissions refers to access control mechanisms, logging security events pertains to monitoring and auditing, and reporting security incidents relates to incident response management. These elements are important for a comprehensive cybersecurity strategy, but they do not directly involve the secure exchange of keys, which is the core purpose of a key exchange protocol.