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CISSP study material · question 244 of 500

An engineer must decide which key usage bit to set for an RSA public key that will encrypt a symmetric content-decryption key. Which bit applies, and what does the neighbouring bit mean?

• Security engineering

1. keyEncipherment, which covers key transport; dataEncipherment covers encrypting raw user data directly and is rare.
2. dataEncipherment, which covers wrapping keys; keyEncipherment covers key agreement.
3. keyAgreement, since a symmetric key is being established.
4. digitalSignature, since the wrapped key authenticates the sender.

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