Unraveling One-Time Pin Flood Attacks

An In-depth Look at the Rise of OTP Flood Attacks and Exploring Innovative Solutions to Safeguard Your Digital Fortress

Hafiq Iqmal
7 min readMay 22


Image by Ekayasa.Design on Freepik

In the ever-evolving world of cyber threats, new attack vectors spring up as quickly as security experts manage to quash old ones. One such emergent threat that has been turning heads in the cybersecurity landscape is the One-Time Pin (OTP) Flood Attack. A threat that’s as complex as it is cunning, these attacks have proven to be particularly damaging to organizations relying heavily on SMS-based authentication methods.

This article aims to unravel the enigma of OTP Flood Attacks, offering readers a comprehensive understanding of their mechanisms, impacts and most importantly, strategies for mitigation. As we journey through this digital labyrinth, we will shed light on the facts, the misconceptions and the imperative for robust cybersecurity measures in our increasingly interconnected world.

OTPs — The Guardian at the Gates

One-Time Pins or OTPs have long been lauded as a reliable mechanism for ensuring secure user authentication. As a unique, short-lived code typically delivered through SMS, email, or an app, OTPs provide an additional layer of security (two-factor authentication) in a world fraught with data breaches and identity theft. Yet, like most things in the digital realm, OTPs are not impervious to abuse.

Unmasking the OTP Flood Attack

OTP Flood Attacks, also known as OTP flooding or OTP spamming, is a type of Distributed Denial of Service (DDoS) attack. It targets OTP mechanisms by inundating them with numerous anonymous requests. This results in a drastic drain on resources, such as the SMS credits of a company.

But why would an attacker do this? The motivations vary. It could be an attempt to disrupt operations, to financially bleed a company by depleting its SMS credits, or as a smokescreen for a more sinister cyber attack.

The Anatomy of an OTP Flood Attack



Hafiq Iqmal

Tech Lead Developer | Software Engineer | Laravel Enthusiasts | CTF Newbie | Medium writer | UiTM Alumni | Husband | Proud father of a beautiful daughter