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In the context of SSL/TLS certificates, what is the difference between key encipherment and data encipherment? What are some examples that highlight the difference?
In the context of SSL/TLS certificates, what is the difference between key encipherment and data encipherment? What are some examples that highlight the difference?
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Log in to answerBest Answer · By JanBask Cyber Security Expert
Answered on Apr 18, 2022
Key encipherment means that the key in the certificate is used to encrypt another cryptographic key (which is not part of the application data). This is used within TLS in the RSA key exchange, where the pre-master secret (from which the symmetric encryption key is derived) is generated by the client, then encrypted with the server's public key and sent to the server and decrypted there with the server's private key. Data encipherment means that the key in the certificate is used to encrypt application data. This is not used in TLS. But certificates are not only used for TLS (for example also in S/MIME, VPN, signing of documents ...) so there might be use cases where this is needed.
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Answered on Jan 28, 2026
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