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JJebitoksharonjebitok.comSep 6 · 11 min read

Challenge: HeartBleed (TryHackMe)

The HeartBleed Challenge on TryHackMe Introduction Heartbleed is one of those vulnerabilities that's survived over a decade as a teaching tool precisely because it's so conceptually simple and so deva

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NSNikhil Sainikhilsaiankilla.hashnode.devAug 9 · 3 min read

PEM vs DER and How to Read an X.509 Certificate

Certificates fail loudly in browsers and quietly in mutual-TLS services. The file on disk might be PEM, DER, or "a .crt that is secretly one or the other," and the error message is usually unable to l

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RMRenukashree Muraliquietbytes.hashnode.devJul 16 · 6 min read

Building a PKI From Scratch, Part 4: Revocation and the CRL

What this does The final part of building a Public Key Infrastructure by hand with Python and OpenSSL. Parts 1–3 built a working three-tier trust chain and issued a real server certificate. This part

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RMRenukashree Muraliquietbytes.hashnode.devJul 15 · 6 min read

Building a PKI From Scratch, Part 3: Issuing a Certificate and Proving the Chain Works

What this does Part 3 of building a Public Key Infrastructure by hand with Python and OpenSSL. Parts 1 and 2 built the Root and Intermediate CAs - pure trust-establishment, nothing signed anything rea

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RMRenukashree Muraliquietbytes.hashnode.devJul 15 · 6 min read

Building a PKI from Scratch, Part 2: The Intermediate CA

What this does Part 2 of building a Public Key Infrastructure by hand with Python and OpenSSL. Part 1 covered the Root CA - a self-signed trust anchor. This part covers the Intermediate CA: a second c

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ASAtharva Sen Baraiblog.rookduel.techMay 19 · 14 min read

Building RookDuel Avikal: From Chess Steganography to Post-Quantum Archival Security

Avikal did not begin as an archival security tool. It began with a question: can data be hidden inside chess? Today, RookDuel Avikal is an open-source archival security system built around the .avk fo

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DPDebanshu Panigrahiblog.debanshupanigrahi.devApr 28 · 2 min read

Quickserve with HTTPS: The No-Fuss Guide

If you're using the QuickServe extension in VS Code and need a Secure Context for local testing (Service Workers, Clipboard API, etc.), you don't need to manually wrestle with OpenSSL via the CLI anym

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Nninecertpulse.hashnode.devApr 26 · 12 min read

SSL Certificate Checker: How to Verify TLS Config Like an SRE

An ssl certificate checker answers one question: will this cert work for the clients you care about, right now, and for how much longer. Most checkers stop at "chain looks fine, padlock is green" and miss the half-dozen ways a certificate can be tech...

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JJebitoksharonjebitok.comJan 28 · 31 min read

b3dr0ck - NGINX, Certificate-based Authentication & OpenSSL (TryHackMe)

The b3dr0ck challenge takes us to Bedrock, where Barney Rubble is setting up the ABC (Abbadabba Broadcasting Company) webserver and struggling with TLS certificate configuration. This beginner-to-intermediate level challenge focuses on certificate-ba...

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SKShubham Kumarchmodshubham.hashnode.devNov 6, 2025 · 7 min read

How LibOQS Uses Valgrind to Hunt for Constant-Time Leaks?

In cryptography, ensuring constant-time execution is a critical defense against timing side-channel attacks. An implementation is considered constant-time if its execution time and memory access patterns are independent of secret-valued inputs. Failu...

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#openssl

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Trending tags this week

Challenge: HeartBleed (TryHackMe)

PEM vs DER and How to Read an X.509 Certificate

Building a PKI From Scratch, Part 4: Revocation and the CRL

Building a PKI From Scratch, Part 3: Issuing a Certificate and Proving the Chain Works

Building a PKI from Scratch, Part 2: The Intermediate CA

Building RookDuel Avikal: From Chess Steganography to Post-Quantum Archival Security

Quickserve with HTTPS: The No-Fuss Guide

SSL Certificate Checker: How to Verify TLS Config Like an SRE

b3dr0ck - NGINX, Certificate-based Authentication & OpenSSL (TryHackMe)

How LibOQS Uses Valgrind to Hunt for Constant-Time Leaks?