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What is client authentication in SSL/TLS ?
Client authentication is a security mechanism where the server verifies the identity of the client using an SSL certificate. It is commonly implemented using mutual TLS (mTLS), where both client and server authenticate each other before a connection is established.
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Why are public CAs stopping client authentication ?
Public Certificate Authorities are designed for public, browser-trusted websites. To reduce ecosystem risk, the CA/Browser Forum has decided that public CAs will no longer issue SSL certificates that support client authentication after June 15, 2026. This change mainly affects enterprise and intranet applications.
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Can public SSL certificates be used for client authentication after 2026 ?
No.
After June 15, 2026, public SSL certificates will support only server authentication. Applications that require client authentication or mutual TLS must use private or enterprise SSL solutions.
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Who should use SSL with client authentication ?
SSL with client authentication is ideal for:
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Intranet applications
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Enterprise software
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Partner, vendor, and supplier portals
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Machine-to-machine (M2M) communication
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APIs requiring strong identity verification
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