Key Rotation for Multi-Factor Authentication
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Solution Overview
Problem
Existing two-factor authentication systems using one-time passcodes (OTPs) are vulnerable to server compromise due to shared symmetric cryptography, which can expose all connected devices, necessitating a method for rapid key rotation to mitigate this risk.
Innovation Solution
A method for key rotation in two-factor authentication systems that initiates key generation and distribution, allowing for the rapid replacement of compromised symmetric or asymmetric keys, enabling secure authentication even without network connectivity and minimizing service disruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If symmetric cryptography is used for OTP authentication, then authentication simplicity and user friendliness are improved, but security vulnerability increases when the server is compromised
Solution Approach 1:
The system performs preliminary key rotation before compromise can occur by monitoring authentication patterns and automatically initiating key rotation when suspicious activity is detected or when pre-defined time intervals elapse, preventing potential server compromise from affecting all devices
Solution Approach 2:
The key rotation system transitions from static long-term symmetric keys to dynamic rotating keys that change over time based on authentication events, time intervals, or security conditions, allowing the system to adapt to potential compromises while maintaining OTP simplicity
2Reliability
If manual key rotation is implemented, then security is improved by replacing compromised keys, but service disruption and operational complexity increase
Solution Approach 1:
The system performs self-service key rotation by automatically detecting when keys should be rotated, generating new keys, and coordinating the distribution to authenticating devices without requiring manual administrator intervention, thus maintaining security while reducing operational complexity
Solution Approach 2:
The system introduces an automated key management intermediary that mediates between the authentication server and authenticating devices, handling key generation, distribution, and rotation coordination to simplify the overall process while maintaining security
3Reliability
If rapid key rotation is implemented, then security resilience is improved, but system complexity and implementation difficulty increase
Solution Approach 1:
The key rotation process is segmented into independent modular components including key generation, key distribution, key activation, and key revocation, allowing each component to be implemented and managed separately while working together to achieve rapid key rotation and security resilience
Data Source
AI summary
A method for key rotation includes initiating key rotation for a user account of a multi-factor authentication platform enabling one-time password authentication using a first symmetric cryptographic key; generating, at an authenticating device, a second symmetric cryptographic key; transmitting, at the authenticating device, the second symmetric cryptographic key to the multi-factor authentication platform; configuring the multi-factor authentication platform and the authenticating device to disable authentication that uses the first symmetric cryptographic key; and configuring the multi-factor authentication platform and the authenticating device to enable authentication that uses the second symmetric cryptographic key.