config.py

"""
Configuration file for Recurrence-Based Time OTP Authentication System
Contains shared constants and parameters used across all components
"""

# Recurrence relation constants
# X_(n+1) = (a * X_n^2 + b * t + c) mod m
a = 13          # Multiplier for squared seed
b = 7           # Multiplier for time component
c = 17          # Additive constant
m = 1000000007  # Large prime modulus for security
seed = 123456789  # Initial seed value

# API Configuration
api_url = "http://localhost:8000"  # FastAPI backend URL (change to network IP for network access)
api_key = "SECRET_KEY"  # API authentication key

# Time Configuration
time_slice_duration = 45  # Default OTP validity duration in seconds
min_validity = 15  # Minimum OTP validity (seconds)
max_validity = 120  # Maximum OTP validity (seconds)

# OTP Configuration
otp_digits = 6  # Number of digits in final OTP
otp_modulus = 10 ** otp_digits  # 1,000,000 for 6-digit OTP