Ephemeral Key Lifetimes for Secure Communication Endpoints
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Solution Overview
Problem
Existing cryptographic systems are vulnerable to attacks when transmission endpoints are compromised, allowing adversaries to access private keys and decrypt secured transmissions, impersonate endpoints, or compromise future communications.
Innovation Solution
Implementing ephemeral keys (EKs) with tactically relevant lifetimes, generated and managed by a secure enclave and trusted platform modules (TPMs), ensuring each key is valid and expires within a defined timeframe, thus preventing unauthorized access and impersonation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cryptographic systems use static private keys for encryption, then data can be securely transmitted, but the system becomes vulnerable to attacks when transmission endpoints are compromised allowing long-term access to encrypted data
Solution Approach 1:
The patent applies dynamics by transitioning from static private keys to dynamic ephemeral keys that are generated for each transmission session and automatically destroyed after use. This ensures that even if an endpoint is compromised, the attacker can only access data encrypted with keys that are no longer valid, limiting the window of vulnerability to the brief period when a key is actively being used for encryption.
Solution Approach 2:
The patent implements disposable cryptographic keys that are generated on-demand, used once for encryption, and then immediately destroyed. These ephemeral keys serve their purpose and are discarded, preventing long-term storage vulnerabilities. The system generates new keys for each transmission, ensuring that compromise of one key does not affect future or past communications.
2Object-affected harmful factors
If ephemeral keys with short lifetimes are used for encryption, then security is improved by limiting the window of vulnerability, but key management complexity increases
Solution Approach 1:
The system implements self-service key management where the communicating parties automatically generate, exchange, and destroy ephemeral keys without requiring manual intervention. The keys are generated locally at the endpoints, automatically transmitted through the cryptographic system, and automatically invalidated after use, reducing the burden on users while maintaining security.
Solution Approach 2:
The patent introduces a cryptographic system as an intermediary that manages the ephemeral keys between communicating parties. This intermediary handles key generation, distribution, and validation, simplifying the overall key management process while enabling the use of short-lived keys that would be difficult to manage manually.
3Ease of operation
If private keys are stored in compromised terminals, then encryption can be performed, but the hostile party can access the encryption system and obtain the private key to impersonate trusted parties or decrypt data
Solution Approach 1:
The patent replaces stored private keys with disposable ephemeral keys that are generated temporarily for each transmission session. These keys exist only in memory during the encryption process and are automatically destroyed afterward, eliminating the security vulnerability of stored keys while maintaining encryption capability. The system can generate new keys on-demand without requiring persistent storage.
Solution Approach 2:
The patent extracts the private key from the terminal hardware by generating ephemeral keys locally in memory rather than storing them persistently. The keys are created temporarily when needed for encryption and are completely removed from the system afterward, preventing hostile parties from extracting or compromising stored cryptographic material while preserving the ability to perform encryption operations.
Data Source
AI summary
A system for providing ephemeral keys for a cryptographic system includes a secure enclave configured to generate one or more ephemeral keys (EKs), where each EK of the one or more EKs has a lifetime associated with the respective EK, and one or more secured devices connected to the secure enclave, where each secured device of the one or more secured devices has a trusted platform module (TPM) configured to acquire at least one of the one or more EKs, where the TPM of each secured device further is configured to generate secured data in response to validating the lifetime of an associated EK by encrypting sensitive data with the associated EK, and where each secured device of the one or more secured devices is further configured to transmit the secured data to an entity external to the secured device.