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: 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 document provides a detailed functional specification for the implementation of Two-Factor Authentication (2FA) within our system. It outlines the functional requirements, data requirements, user interface requirements, and other essential aspects to ensure a successful implementation.

Purpose

The purpose of this FSD is to define the functional requirements for implementing Two-Factor Authentication (2FA) to enhance the security of user accounts.

Scope

This document covers the functional requirements for the implementation of 2FA within our system. It includes the necessary steps to integrate 2FA, user interface changes, and data handling processes.

Definitions, Acronyms, and Abbreviations

• 2FA: Two-Factor Authentication
• OTP: One-Time Password

References

• NIST Special Publication 800-63B: Digital Identity Guidelines
• RFC 6238: TOTP: Time-Based One-Time Password Algorithm

Overview

The goal of this project is to enhance the security of user accounts by implementing Two-Factor Authentication (2FA). The 2FA process will require users to provide an additional form of authentication, such as an OTP, in addition to their regular password.

Functional Requirements

Requirement 1: 2FA Implementation

• ID: FR-001
• Description: Implement Two-Factor Authentication (2FA) for user accounts.
• Priority: High
• Source: Security team
• Rationale: To enhance the security of user accounts by requiring an additional form of authentication.
• Acceptance Criteria:
  • Users must enter their password and an OTP to access their accounts.
  • OTPs must be generated using a time-based algorithm (TOTP).
  • The system should support the use of authenticator apps (e.g., Google Authenticator).
  • Users should be able to enable or disable 2FA from their account settings.
• Dependencies: Integration with a third-party OTP generation service.

Data Requirements

• User account data must include a field for storing 2FA status (enabled/disabled).
• Store the secret key used for generating OTPs securely.

User Interface Requirements

• Add a section in the account settings for enabling/disabling 2FA.
• Provide instructions for setting up an authenticator app.
• Display an input field for OTP during the login process.

Non-Functional Requirements

• Performance: The 2FA process should not add more than 2 seconds to the login time.
• Security: Ensure that the secret key and OTPs are transmitted and stored securely.
• Usability: The 2FA setup process should be user-friendly and straightforward.

Assumptions

• Users have access to a smartphone to use an authenticator app.
• The system currently has a secure user authentication mechanism in place.

Constraints

• The implementation must comply with industry standards for 2FA and data security.
• The system should be able to handle increased load due to the additional authentication step.

Acceptance Criteria

• Successful login should require both a password and a valid OTP.
• Users should be able to enable and disable 2FA from their account settings.
• The system should log 2FA-related activities for security auditing.

Appendix

• Authenticator App Setup Guide
• Security Best Practices for 2FA

Approval

• Prepared by: Mike Meier
• Email: mikemeier@mad-tech.ai
• Date: 04/29/2025
• Approved by: [Approver's Name]
• Date: [Approval Date]