What SSL/TLS encryption mode should I use in Cloudflare?

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Grade: Education Subject: Support
What SSL/TLS encryption mode should I use in Cloudflare?
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Cloudflare offers several SSL/TLS modes. 'Flexible' encrypts traffic between the browser and Cloudflare, but not between Cloudflare and your origin server. 'Full' encrypts both, but requires a valid SSL certificate on your origin server. 'Full (strict)' is the most secure, requiring a valid certificate and verifying its authenticity. 'Full (strict)' is recommended for maximum security, but 'Full' is a good starting point if you're having certificate issues.