Why Web Security is Important
No matter how advanced web security standards become, there may always be a way for hackers and thieves to penetrate important and valuable information within a website's database. This could mean thousands or even millions of people losing sensitive information to people who are willing to abuse and exploit that data. It is therefore no question that a website which implements better security standards is of greater value to the user, to themselves, and to the internet community.
Although a detailed analysis of web security may require a vast technical understanding of computer science, the basic concepts can be generalized and understood for the purposes of SEO implementation.
Components of Security
SSL Certificate Authentication
SSL (Secure Socket Layer) Certificates are one of the first steps to securing a website, especially when private information is entered by a user, such as personal information and credit card numbers. The lack of a verifiable SSL on web pages containing input boxes may results in a red flag.
Use cryptographic keys to send data from server to computer. This is usually standard practice.
Number of Certificates
Having more than one certificate is better than none, but there is a point of diminishing return. Some certs serve different purposes so look into what you need an SSL for and then find the 2 most reputable companies that offer it.