In recent years, security in digital communications has become a priority for companies in every sector. With the growing use of digital platforms and the resulting increase in sensitive transactions over the internet, SSL/TLS certificates have become one of the fundamental pillars for guaranteeing the privacy and integrity of the data exchanged. These certificates encrypt communications between servers and users. As a result, they prevent confidential information, such as login credentials, financial data and other sensitive content, from being intercepted by malicious third parties.
SSL (Secure Sockets Layer) and TLS (Transport Layer Security) are protocols that ensure data transmitted between the user’s browser and a company’s server or website is protected against unauthorised access; SSL/TLS certificates are what make it possible to establish this protected connection. Although many people use the two terms interchangeably, TLS is a newer and more secure version of SSL. However, out of familiarity, the term “SSL” still prevails.
This article takes an in-depth look at the role of SSL/TLS certificates in digital security, their benefits and how they work. It also explains why implementing them is essential on any document management platform or digital environment that handles sensitive data.
The role of SSL/TLS certificates in data protection
The main function of an SSL/TLS certificate is to ensure that communications between a server and a user’s browser are secure. These certificates use asymmetric cryptography to create a secure connection, which makes it virtually impossible for transmitted data to be read or modified in transit.
When a user visits a website protected by SSL/TLS, a set of automatic processes, known as the “SSL/TLS handshake”, takes place in the background. During this process, the user’s browser checks the validity of the server’s SSL certificate and establishes an encrypted connection if the certificate is legitimate. In this way, all subsequent communications remain protected.
In addition to protecting data during transmission, SSL/TLS certificates also play an important role in authentication. They ensure that the user is communicating with the intended server and not with a fraudulent entity that may be trying to intercept communications.
Benefits of using SSL/TLS certificates
Implementing SSL/TLS certificates offers a wide range of benefits for organisations that use digital platforms. The main benefits include:
Data encryption
The most obvious benefit is data encryption, which prevents third parties from accessing or modifying the information transmitted between the server and the client. This layer of protection is especially important on document management platforms, where large volumes of confidential information are frequently exchanged between users and systems.
Authentication and trust
SSL/TLS certificates provide authentication, ensuring that users are interacting with the legitimate server and not with a malicious replica. For companies that handle sensitive data, such as those operating in document management environments, this identity check is crucial to maintaining user trust.
Better SEO and user trust
Search engines such as Google now give preference in their rankings to websites that use HTTPS, which is the result of implementing SSL/TLS. Therefore, having an active SSL/TLS certificate can improve a website’s visibility, bringing more traffic and improving the user experience. Furthermore, users tend to place more trust in websites that display the “padlock” icon in the browser’s address bar, a sign that the connection is secure.
Regulatory compliance
Many sectors must comply with strict standards regarding data protection. Consequently, implementing SSL/TLS certificates can help companies comply with regulations such as the General Data Protection Regulation (GDPR) and other data privacy and security laws, minimising the risk of penalties and fines.
Types of SSL/TLS certificates
There are several types of SSL/TLS certificates available, each designed to meet different needs and levels of validation. The main types include:
Domain validation (DV) certificate
Domain validation certificates are the most basic and affordable type of SSL/TLS. They only check whether the applicant controls the domain they are trying to protect. However, they do not offer a high level of authentication, so they are better suited to personal websites or blogs, where there is no need to verify a business identity.
Organisation validation (OV) certificate
These certificates offer an additional layer of security, since they verify the identity of the organisation as well as the domain. They are a common choice for companies that run commercial websites and digital platforms, because they give users additional confidence.
Extended validation (EV) certificate
Extended validation certificates are the type of SSL/TLS certificate with the most demanding validation process. In addition to verifying the domain and the organisation, they involve a thorough check of the company, ensuring the highest level of authentication. However, current browsers no longer display the company name in the address bar, so the visible difference for the user is now small.
Wildcard and multi-domain certificates
Wildcard certificates protect a domain and all its subdomains, while multi-domain certificates can protect several domains and subdomains with a single certificate. They are therefore ideal for companies that manage several platforms or sections of a website and want to simplify certificate management.
Best practices for implementing SSL/TLS certificates
Although implementing an SSL/TLS certificate is relatively simple, there are some recommended practices that companies should follow to ensure maximum security and efficiency:
Keep SSL/TLS certificates up to date
SSL/TLS certificates have a limited validity period. Since March 2026, the maximum validity of public certificates has been 200 days, and the industry has already approved progressive reductions down to 47 days in 2029. Companies should therefore automate renewal and monitor their certificates’ expiry dates, so that they are renewed before they expire. This avoids service interruptions and ensures continuous security.
Use strong SSL/TLS certificates
Companies should choose certificates that use robust encryption algorithms, such as RSA with 2048 bits or higher. By contrast, certificates with weaker algorithms may be vulnerable to cryptographic attacks.
Make sure all content is served over HTTPS
Some pages may not be fully protected by SSL/TLS, which results in “mixed content” warnings. Companies should ensure that all website resources, including images, scripts and CSS files, are loaded over HTTPS to avoid security gaps.
Monitor and audit regularly
Regularly monitoring the performance and effectiveness of SSL/TLS certificates is essential to ensure that the platform remains secure. In addition, security audits can help to identify vulnerabilities before they become critical problems.
Protocol versions: What should be enabled
Despite its popular name, SSL should no longer be used. SSL 2.0 and 3.0, as well as TLS 1.0 and 1.1, are obsolete and have known vulnerabilities. Today, servers should only accept TLS 1.2 and TLS 1.3, with TLS 1.3 being the fastest and most secure option.
Configuration matters as much as the version. For example, it is advisable to use only modern cipher suites, enable HSTS to enforce secure connections and prefer ECDSA keys or RSA keys of at least 2048 bits. This way, the platform benefits from all the protection the protocol offers.
Practical example: The certificate that expired at the weekend
Consider a document management platform whose certificate expires on a Saturday. On Monday, hundreds of contractors try to log in and the browser displays a warning that the connection is not secure. Many give up, while others contact support, which becomes overloaded.
After the incident, the technical team sets up automatic certificate renewal and an alert 30 days in advance. In addition, it includes the certificate check in the platform’s daily monitoring. As a result, the problem does not recur, even with ever shorter validity periods.
Frequently asked questions
Does the padlock in the browser guarantee that the site is legitimate?
Not entirely. The padlock indicates that the connection is encrypted, but fake sites can also have valid certificates. For this reason, it is important to always check the site’s address.
Are free certificates secure?
Yes. Free domain validation certificates offer the same encryption as paid ones. The difference lies in the level of verification of the organisation’s identity.
Conclusion
Implementing SSL/TLS certificates is an essential measure to secure digital communications and protect sensitive data on any online platform. For organisations operating in document management environments, adopting SSL/TLS is a vital component of their cybersecurity strategy, helping to prevent data breaches and maintain user trust.
SSL/TLS certificates offer not only data protection but also additional benefits, such as improved SEO and support for regulatory compliance. By following best practices for their implementation and maintenance, companies can create a safer, more reliable and more efficient digital environment.
Read also: HTTPS Hypertext Transfer Protocol and The importance of encryption in data protection.
For European recommendations on cybersecurity, see ENISA.