Public Key Infrastructure (PKI) Practice Exam

The correct answer is that no one is allowed to share a private signing key. In a Public Key Infrastructure (PKI), the private signing key is a crucial component of the cryptographic process, used to sign digital documents or certificates to verify authenticity. The security of private keys is paramount, as sharing them would undermine the integrity of the system.

If a private signing key is disclosed to unauthorized individuals, it poses significant risks, including unauthorized access and the ability for malicious parties to impersonate users or systems. This is why the private signing key is kept confidential and is only accessible to the entity that owns it.

Other options such as an immediate supervisor, the IT department, or trusted colleagues imply a level of access that contradicts the principle of key security. Allowing any of these groups to share or access the private signing key could lead to potential security breaches, highlighting the necessity for strict controls and adherence to best practices around key management.

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