CloudFlare has deployed a new level of encryption on its service that hardens and speeds up users experience, especially when accessing domains via mobile browsers. The form of encryption, a relatively new transport layer cipher suite known as ChaCha20-Poly1305, has largely been used by Google until now. The algorithm is based on a combination of two other ciphers, ChaChA20 and Poly1305 MAC, both crafted by cryptographer Daniel Bernstein in 2008 and 2005 respectively.
Source: https://threatpost.com/cloudflare-deploys-new-form-of-encryption-across-sites/111234/