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Security

SHA-1: From Hero to Zero

For two decades, SHA-1 was the backbone of internet security—protecting SSL certificates, signing software, and verifying Git commits. Then in 2017, Google shattered it. Literally. This post traces SHA-1's journey from government-approved standard to cryptographic casualty, culminating in the SHAttered attack that proved its collision resistance was

MD5: From Hero to Zero

In 1991, MD5 was the gold standard of cryptographic hash functions. Today, it's a cautionary tale in cryptographic history. This post traces MD5's journey from trusted workhorse to deprecated relic, and the attacks that brought it down. What is MD5? MD5 (Message-Digest Algorithm 5) is a

The Evolution of Wi-Fi Security: From WEP to WPA3

Wi-Fi security has undergone dramatic changes since the late 1990s. What started as a fundamentally flawed encryption scheme has evolved into robust, cryptographically sound protocols. Understanding this evolution helps you appreciate why certain practices matter and why you should never connect to a WEP network. This guide walks through each

Understanding SSH Key Random Art

Understanding SSH Key Random Art

When you generate an SSH key pair, you might have noticed a peculiar ASCII art image appear alongside your key fingerprint: +--[ED25519 256]--+ | .o+= | | . .o.o | | . + .+ | | . = B .o | | . + S + . | | o + = o . | | . o B = .. ..| | . = * o..o.o| | E . o.oo+=+| +----[SHA256]-----+ This image is called randomart, and

The Mathematics of RSA Encryption

The Mathematics of RSA Encryption

RSA is one of those things that sounds complex until someone explains it with a clear example. Let's break it down step-by-step, with small, human-readable numbers, so it's easy to follow and fun to understand. What is RSA? RSA is a powerful and widely-used asymmetric encryption

How to Reset Ghost Admin Password via Database

How to Reset Ghost Admin Password via Database

When you've lost access to your Ghost admin account and can't use the email-based password reset, you can reset the password directly in the MySQL database. Prerequisites * SSH access to your Ghost server * MySQL database credentials (found in Ghost's config.production.json) * Node.js

AES Encryption Decryption Tool in .NET 8 (Console App)

AES Encryption Decryption Tool in .NET 8 (Console App)

Here is the code! copy it and paste it inside a file (say AESFileEncryptDecrypt.csx) and then run it with dotnet-script AESFileEncryptDecrypt.csx. I am assuming that you already have dotnet-script tool installed globally in your computer as well as .NET 8 SDK. In case you don't, you