Posts on Keerthi Vibisan

Understanding Clock Speed

Sun, 16 Nov 2025 00:00:00 +0000

Ever wondered what “2.4 GHz” on your Smartphone or laptop box really means? Inside every CPU, billions of tiny heart beats happen every second. Each one driving your apps, games and system forward. Discover how a single clock tick turns into real computing power.

Device-Centric Authentication

Sun, 14 Sep 2025 00:00:00 +0000

I believe the future of authentication lies in something we already carry everywhere with us, our mobile devices. IAM is changing, Users no longer want to remember or enter complex passwords every time. Also the security team no longer trust the static passwords that can be stolen or phised.
So i think by turning devices into secure identity, we can make authentication user friendly and secure proof.

Bi-Directional Database Synchronization

Sat, 26 Jul 2025 13:40:20 +0530

Recently, I worked on a real-time user database where we needed to enable bidirectional data synchronization between on-premises and cloud database systems. In this blog, Let’s see how we achieved that using SymmetricDS, an open-source tool that made it possible with minimal configurations. By using its trigger-based change data capture (CDC), conflict resolution and decentralized architecture, we were able to sync data in both directions efficiently.

Symmetric Key - Encryption & Decryption

Sun, 18 May 2025 00:00:00 +0000

Our Sensitive data's are by default in clear text, when they are stored in RAM or in transit, so anybody who can read RAM or Data packets can get our information, so it is our responsibility to secure it, we cannot stop any one from reading it, but we can make the data un-understandable using encryption techniques.

Cryptography - Intro

Sun, 20 Apr 2025 00:00:00 +0000

We all know HTTPS is more secure than HTTP—but have you ever wondered why? The difference isn’t just an extra “S”. It’s cryptography working behind the scenes. It turns your private data into unreadable code.

JOSE Standards

Sat, 08 Feb 2025 11:31:13 +0530

Exploration of the JOSE (JSON Object Signing and Encryption) standards, which provide a framework for securely signing, encrypting, and exchanging JSON-based data.

How Emails Work: Behind the Scenes

Sun, 01 Dec 2024 00:00:00 +0000

Emails are part of modern communication, but have you ever thought how an email travels from your device to the recipient’s inbox ?

Multi-Factor Authentication (MFA)

Sat, 19 Oct 2024 16:59:10 +0530

It is an authentication method that requires user’s to provide two or more verification factors to gain access to a system or application, rather than relying on one factor or authentication (which is commonly a password).

can combination of password and security question check can be qualified as MFA?

No, having password + security question check will not be qualified as MFA. Because both password and security question belong to the same authentication factor or category.

Wi-Fi Security

Thu, 03 Oct 2024 20:54:48 +0530

Wi-Fi security has evolved significantly since the introduction of WEP in 1999. Early attempts, like WEP, provided basic protection but were easily compromised. WPA, introduced in 2003, improved security by dynamically changing encryption keys but retained some vulnerabilities. WPA2, launched in 2004, brought robust encryption with AES, though it faced issues like the KRACK vulnerability. In 2018, WPA3 addressed these weaknesses, introducing stronger encryption and protections against offline attacks. The blog also explains the critical 4-way handshake, a process that ensures secure communication between devices on a network.