Functional Specification Document (FSD)

Table of Contents

1. Introduction
2. Purpose
3. Scope
4. Definitions, Acronyms, and Abbreviations
5. References
6. Overview
7. Functional Requirements
   • Requirement 1: Implement 2FA
8. Data Requirements
9. User Interface Requirements
10. Non-Functional Requirements
11. Assumptions
12. Constraints
13. Acceptance Criteria
14. Appendix
15. Approval

Introduction

This document provides a detailed specification for implementing Two-Factor Authentication (2FA) to enhance the security of our system. It outlines the functional and non-functional requirements, data requirements, user interface requirements, and other relevant details.

Purpose

The purpose of this FSD is to detail the functional requirements for implementing 2FA in our system, ensuring that all stakeholders have a clear understanding of what needs to be developed, tested, and delivered.

Scope

This FSD pertains to the 2FA Project aimed at enhancing system security by implementing Two-Factor Authentication.

Definitions, Acronyms, and Abbreviations

• 2FA: Two-Factor Authentication
• OTP: One-Time Password
• SMS: Short Message Service
• TOTP: Time-based One-Time Password

References

• N/A

Overview

The goal of the 2FA Project is to increase the security of user accounts by requiring an additional form of authentication beyond the standard username and password. This additional layer will help prevent unauthorized access.

Functional Requirements

Requirement 1: Implement 2FA

• ID: FR-001
• Description: Implement Two-Factor Authentication (2FA) for user login. After entering the correct username and password, the user must provide a second form of authentication, such as an OTP sent via SMS or generated by an authenticator app.
• Priority: High
• Source: Security Audit
• Rationale: To enhance the security of user accounts by requiring a second form of authentication in addition to the password.
• Acceptance Criteria:
  • Users must enter their username and password.
  • After successful password authentication, users must enter an OTP sent via SMS or generated by an authenticator app.
  • The system must validate the OTP before granting access.
• Dependencies:
  • SMS gateway or integration with an authenticator app.
  • User database to store and manage 2FA settings.

Data Requirements

• User account data must include a field to store the 2FA method (e.g., SMS, authenticator app).
• OTPs must be securely generated and stored temporarily for validation.

User Interface Requirements

• Login screen must be updated to include a second step for OTP entry.
• Users must have the option to configure their preferred 2FA method via their account settings.

Non-Functional Requirements

• Performance: The OTP generation and validation process must not exceed 2 seconds.
• Security: OTPs must be securely transmitted and stored using encryption.
• Usability: The 2FA process must be user-friendly and provide clear instructions.

Assumptions

• Users have access to a mobile phone or device capable of receiving SMS or running an authenticator app.
• The system has access to an SMS gateway or can integrate with an authenticator app.

Constraints

• Implementation must comply with relevant data protection regulations.
• Limited budget for SMS gateway services.

Acceptance Criteria

• Successful implementation of 2FA for user login.
• No unauthorized access to user accounts during the testing phase.
• Positive feedback from user testing regarding the usability of the 2FA process.

Appendix

• N/A

Approval

• Prepared by: Mike Meier
• Email: mikemeier@mad-tech.ai
• Date: 03/12/2025
• Approved by: [Approver's Name]
• Date: [Approval Date]