November 9, 2026 · 5 min read – Certificate File Formats Explained: PEM, DER, PKCS#7 and PFXCertificate File Formats Explained: PEM, DER, PKCS#7 and PFX
Certificate File Formats Explained: PEM, DER, PKCS#7 and PFX
Install a certificate and you soon meet a jumble of file extensions: .pem, .crt, .cer, .der, .key, .p7b, .pfx and .p12. One server wants two files, another wants a single file with a password, and sometimes a server rejects a file even though the certificate inside ... Continue Reading →
How to Create a Private Key and CSR With OpenSSL
Before a certificate authority can issue a certificate, it needs the public key it is going to vouch for. You hand it over in a certificate signing request, or CSR. The key pair and the CSR are created on your own machine, usually with the free OpenSSL toolkit. ... Continue Reading →
How Certificate Authorities Work: DV, OV and EV Explained
For a browser to trust a website’s certificate, the certificate must be signed by a certificate authority (CA). The CA vouches that whoever asked for the certificate really controls the domain and, for some certificate types, that a real organisation stands ... Continue Reading →
How the Certificate Chain of Trust Works
A certificate is only as trustworthy as the organisation that signed it. So how does your browser know it can trust that organisation? The answer is the chain of trust: from a website’s certificate, a series of signatures leads up to a root certificate that ... Continue Reading →
What Is an X.509 Certificate? What Is Inside a Certificate
Every time your browser shows a padlock next to a web address, it has first checked a certificate. That certificate is a small file the server sends while the connection is being set up, and it almost always follows the same standard: X.509. The standard defines ... Continue Reading →
Do You Need Antivirus in 2026? Built-in Protection Explained
Antivirus companies would like you to believe that a computer without a paid security suite is in constant danger. At the same time, many experts say the built-in protection is enough. Who is right? For most home users in 2026, the honest answer is: the free protection ... Continue Reading →
How to Choose a Laptop in 2026: A Practical Buying Guide
Laptop shopping can feel overwhelming: hundreds of models, confusing processor names and marketing terms like “AI PC” on every box. Yet most of the decision comes down to a handful of questions: what you will use it for, which operating system you prefer, ... Continue Reading →
How to Find a Lost or Stolen Phone (Android and iPhone)
Losing a phone is stressful: it holds your photos, messages, banking apps and often the codes you need to log in everywhere else. Whether it slipped between the sofa cushions, was left in a taxi or was stolen, the right steps in the first minutes make a big difference. ... Continue Reading →
Mesh Wi-Fi vs Range Extender: Which Do You Need?
When one router cannot cover your whole home, there are two popular ways to extend Wi-Fi: a cheap range extender that plugs into a socket, or a mesh system with several matching units. Both promise “Wi-Fi everywhere”, but they work very differently, ... Continue Reading →
Recent Comments