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: User Authentication
   • Requirement 2: 2FA Implementation
8. Data Requirements
9. User Interface Requirements
10. Non-Functional Requirements
11. Assumptions
12. Constraints
13. Acceptance Criteria
14. Appendix
15. Approval

Introduction

This Functional Specification Document (FSD) outlines the functional requirements for the implementation of Two-Factor Authentication (2FA) in our system. It provides a detailed description of the features and functionalities required to enhance the security of user authentication.

Purpose

The purpose of this FSD is to provide a comprehensive guide for the development and implementation of 2FA in our system. It aims to ensure that all stakeholders have a clear understanding of the requirements and that the development team has a detailed roadmap to follow.

Scope

This FSD pertains to the implementation of 2FA in our existing authentication system. It covers the addition of a secondary authentication method that will be required after the initial password-based login.

Definitions, Acronyms, and Abbreviations

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

References

• Company Security Policy Document
• Authentication System API Documentation
• User Experience Guidelines

Overview

The goal of this project is to enhance the security of our user authentication process by implementing 2FA. This involves requiring users to provide a second form of identification in addition to their password. The secondary form of identification will be an OTP sent via SMS or generated by an authenticator app.

Functional Requirements

Requirement 1: User Authentication

• ID: FR-001
• Description: The system must authenticate users using their username and password.
• Priority: High
• Source: Security Policy
• Rationale: To ensure that only authorized users can access the system.
• Acceptance Criteria: The system successfully authenticates users using their username and password.
• Dependencies: None

Requirement 2: 2FA Implementation

• ID: FR-002
• Description: The system must implement Two-Factor Authentication (2FA) for all users.
• Priority: High
• Source: Security Policy
• Rationale: To enhance the security of the authentication process.
• Acceptance Criteria: The system requires users to enter an OTP after entering their password.
• Dependencies: User Authentication (FR-001)

Data Requirements

• User account data, including phone numbers for SMS-based OTP.
• Secure storage of 2FA configuration settings.
• Logs of authentication attempts and 2FA challenges.

User Interface Requirements

• A prompt for OTP input after successful password entry.
• An option for users to choose their preferred 2FA method (SMS or authenticator app).
• Error messages for invalid OTP entries.
• Instructions for setting up 2FA.

Non-Functional Requirements

• Performance: The 2FA process should not significantly delay the overall authentication process.
• Security: OTPs must be securely generated and transmitted.
• Usability: The 2FA process should be user-friendly and intuitive.

Assumptions

• Users have access to a mobile device for receiving OTPs.
• Users will be willing to set up and use 2FA.

Constraints

• The implementation must comply with existing security policies and guidelines.
• The system must support both SMS and authenticator app-based OTPs.

Acceptance Criteria

• The system requires an OTP for all login attempts.
• Users can successfully set up 2FA.
• The system logs all 2FA-related activities.

Appendix

• Sample OTP SMS format.
• Mockups of the 2FA user interface.

Approval

• Prepared by: Mike Meier
• Email: MikeMeier@Mad-Tech.AI
• Date: 01/27/2025
• Approved by: [Approver's Name]
• Date: [Approval Date]