Security is indeed a crucial aspect of IT infrastructure, and it's vital for ensuring the protection of data and maintaining user trust. Here are some key points to remember about security services in IT:

1. Encryption and Secure Communication:

• Encryption protocols like TLS (Transport Layer Security) and SSL (Secure Sockets Layer) are essential for securing data during transmission over networks.
• HTTPS (Hypertext Transfer Protocol Secure) ensures secure communication between web browsers and websites by encrypting data exchanged.
• HTTPS is also referred to as HTTP/TLS or HTTP/SSL.
• In fact, SSL version 3.0 was essentially TLS version 1.0. But TLS's new features and updates have made it more secure than SSL.

2. Certificate Authorities (CAs):

• Certificate authorities are trusted entities that issue digital certificates.
• Digital certificates verify the authenticity of websites and web servers, providing assurance to users that they are interacting with a legitimate source.
• CAs play a critical role in validating and issuing digital certificates to website owners.

3. TLS vs. SSL:

• TLS (Transport Layer Security) is the modern and more secure protocol for securing communications over a network.
• SSL (Secure Sockets Layer) has been deprecated due to security vulnerabilities and is not recommended for use.

4. Security Layers:

• Security should be integrated into all layers of an IT infrastructure, including network security, server security, and application security.
• A layered approach to security helps protect against various threats and vulnerabilities.

5. IT Security Responsibility:

• Security is a collective responsibility and should involve all employees in an organization, not just security engineers.
• Security awareness and best practices should be promoted throughout the organization.