A recent publication [1] proves how the encryption behind HTTPS may fail in practice. Researchers found that 18% of HTTPS – TOP 1 Million Domains and 25% of SSH Servers are using 1024-bit primes instead to encrypt their connections. The mathematics work but the implementation and configuration are the weakest links in the chain most of the time. You better read whats next: You need to update your browser and use a 2048-bit Diffie-Hellman Group.”]
Source: https://hitachi-systems-security.com/5-things-you-must-know-about-https-encryption/