Which of the following is the best way to securely store an encryption key for a data set in a manner that allows multiple entities to access the key when needed?

Rationale

Key escrow is the best way to securely store an encryption key for a data set in a manner that allows multiple entities to access the key when needed.

Key escrow involves securely storing an encryption key with a trusted third party, allowing designated entities to access it as required while maintaining security and control over the key itself.

A (Public key infrastructure) YOUR ANSWER

Public key infrastructure (PKI) is primarily designed to manage digital certificates and public-private key pairs for secure communication. While it facilitates key exchange, it does not inherently provide a mechanism for storing and sharing a single encryption key among multiple entities. Instead, it focuses on authenticating identities and securing communications rather than on key escrow arrangements.

B (Open public ledger) YOUR ANSWER

An open public ledger, such as a blockchain, allows for transparent record-keeping and data verification but does not provide a secure mechanism for storing encryption keys. This method exposes data to all participants on the network, posing a significant risk for sensitive encryption keys that need controlled access rather than public visibility.

C (Public key encryption) YOUR ANSWER

Public key encryption utilizes a pair of keys (public and private) for secure data exchange, but it does not involve the shared storage of encryption keys. This method allows individuals to encrypt messages for one another without needing to access a common key. While secure for communication, it does not meet the requirement for multiple entities needing access to a single encryption key.

D (Key escrow) CORRECT

Key escrow is specifically designed to securely store an encryption key with a trusted authority, enabling multiple designated entities to retrieve the key when necessary. This balance of accessibility and security makes key escrow the most suitable option for scenarios where a shared key needs to be managed safely.

Conclusion

Key escrow provides a secure and accessible solution for storing encryption keys, allowing multiple entities to access them as needed without compromising security. In contrast, the other options—public key infrastructure, open public ledger, and public key encryption—either do not involve shared key storage or expose sensitive information to unauthorized access. Thus, key escrow stands out as the optimal choice for secure key management in collaborative environments.

Which of the following is the best way to securely store an encryption key for a data set in a manner that allows multiple entities to access the key when needed?

Key escrow is the best way to securely store an encryption key for a data set in a manner that allows multiple entities to access the key when needed.

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