Pluggable Cipher Suite Negotiation for Legacy Client Compatibility
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Solution Overview
Problem
Existing data security systems face challenges in maintaining up-to-date cryptographic software on client computers and ensuring secure data transmission, particularly when client systems are not patched or misconfigured, leading to potential unauthorized access and compromised cryptographic keys.
Innovation Solution
The implementation of an envelope-based encryption scheme that uses a data encryption key server to manage and update encryption keys, along with pluggable cipher suites negotiated during secure transport protocols, to ensure secure data transmission and key management, even when client systems are not fully compatible.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If server-side encryption is used to provide higher cryptography performance, then encryption speed is improved, but security against unauthorized clients with stolen credentials deteriorates
Solution Approach 1:
The encryption system is segmented into client-side encryption components and server-side decryption components. The client encrypts data locally using cryptographic keys before transmission, while the server only performs decryption operations. This segmentation ensures that even if server credentials are compromised, attackers cannot decrypt data without the client-held cryptographic keys.
Solution Approach 2:
A key management service acts as an intermediary between clients and servers, handling cryptographic key distribution and rotation. The service enables clients to update their cryptographic keys without requiring server-side changes, allowing clients to independently enhance security while maintaining server-side encryption performance.
2Reliability
If cryptographic protocols are updated frequently to respond to new security threats, then security is improved, but compatibility with unpatched client systems deteriorates
Solution Approach 1:
The system implements dynamic cipher suite negotiation where the server can adaptively select from multiple supported cipher suites based on client capabilities. During the TLS handshake, the server receives the client's cipher suite preferences and dynamically chooses the most secure mutually-supported algorithm, allowing the system to maintain security while supporting both modern and legacy clients.
Solution Approach 2:
The server configuration includes multiple cipher suites with different security parameters and algorithm combinations. By changing which cipher suites are enabled and in what order of preference, the system can adjust its security posture to match the capabilities of connecting clients, whether they are modern unpatched systems or newer securely-updated systems.
3Reliability
If the server rejects connections from clients with unsupported cipher suites, then security is improved, but interoperability deteriorates
Solution Approach 1:
The server implements dynamic cipher suite selection during the TLS handshake process. Instead of statically rejecting clients, the server dynamically evaluates the client's supported cipher suites against its own supported list and selects the best matching algorithm. This dynamic approach maintains security by never using unsupported algorithms while preserving interoperability by accepting connections from clients with varying cryptographic capabilities.
Data Source
AI summary
The present document describes systems and methods that provide an envelope including an encrypted message and a data encryption key reference. A message is encrypted with a data encryption key to produce an encrypted message. The data encryption key is further encrypted using a key encrypting key to produce an encrypted data encryption key. An envelope includes the encrypted message and the data encryption key reference is then provided to a recipient.