Secure Cloud Communication Protocol for UDP Reliability
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Solution Overview
Problem
Current cloud communication security protocols, such as SSL/TLS/DTLS, face limitations in handling new security threats, maintaining middlebox compatibility, and ensuring secure UDP communications, which are prone to data loss and unordered delivery, making them inefficient for modern cloud computing demands.
Innovation Solution
A secure data-in-transit cloud communications protocol utilizing symmetric block encryption, cryptographic hash, public key cryptography, and ephemeral key exchange mechanisms, with a central key server for authentication and message fragmentation, sequencing, and re-transmission to ensure reliable and secure TCP and UDP communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional security protocols (SSL/TLS/DTLS) are used to protect cloud communications, then security is provided, but they cannot satisfy growing security demands due to vulnerabilities to MITM attacks, downgrade attacks, and other security threats
Solution Approach 1:
The protocol segments the communication into distinct phases (handshake, data transfer, session resumption) with specific security measures for each phase. The handshake is divided into multiple rounds with increasing security strength, allowing the system to adapt to different threat levels while maintaining overall security reliability
Solution Approach 2:
The protocol implements dynamic security adaptation through version negotiation and cipher suite selection during the handshake phase. The system can dynamically adjust security parameters based on the capabilities of communicating parties and current threat models, enabling both high security and adaptability to new threats
2Speed
If TLSv1.3 merged handshake messages to reduce roundtrip time, then connection speed is improved, but security is weakened because communications before ServerHello are unencrypted allowing MITM and downgrade attacks
Solution Approach 1:
The handshake is segmented into multiple encrypted rounds rather than merging messages. Each round (Round 1, Round 2, Round 3) transmits specific cryptographic information in encrypted form, ensuring that even if one round is intercepted, the security of other rounds remains intact. This segmentation maintains security while achieving fast connection establishment
Solution Approach 2:
The protocol performs preliminary key exchange and encryption setup in Round 1 before any sensitive data is transmitted. The ClientHello and ServerHello messages contain pre-computed cryptographic parameters that establish encryption for subsequent rounds, ensuring that all handshake communications are protected from MITM attacks from the outset
3Speed
If UDP is used for connectionless services (gaming, streaming, IoT), then low latency and real-time communication are achieved, but security is compromised due to lack of reliable delivery and unordered datagram characteristics
Solution Approach 1:
The protocol segments data transmission into numbered datagrams with sequence tracking. Each UDP datagram carries a sequence number and the receiver can detect lost packets by identifying gaps in the sequence. This allows reliable delivery to be achieved on top of UDP's connectionless nature without sacrificing low latency
Solution Approach 2:
The protocol introduces an application-layer intermediary mechanism that operates over UDP to provide reliability. This intermediary handles sequence numbering, acknowledgment, and retransmission of lost datagrams, effectively mediating between UDP's speed and reliability requirements without requiring full TCP-style connection management
4Speed
If UDP datagrams are sent for large data transmission, then low latency is maintained, but data loss and out-of-order delivery occur making security verification difficult
Solution Approach 1:
Large data is segmented into multiple UDP datagrams with sequence numbers. The receiver reassembles them in the correct order using these sequence numbers, ensuring that even though UDP delivers datagrams independently, the final reconstructed data maintains integrity and ordering. This segmentation approach preserves speed while preventing information loss
Solution Approach 2:
The protocol incorporates forward error correction and redundancy mechanisms beforehand in the data preparation phase. Checksum fields and optional acknowledgment requests are built into each datagram structure, providing cushioning against potential data loss before it occurs, allowing the system to maintain high speed while protecting against information loss
Data Source
AI summary
A cloud communication architecture addresses shortcomings of traditional security protocols (e.g., SSL/TLS) in cloud computing, providing security for data-in-transit and authenticity of cloud users (CUs) and cloud service providers (CSPs). The architecture also protects the communication channel against attacks such as man-in-the-middle (MITM) (including eavesdropping, sniffing, identity spoofing, data tampering), sensitive information disclosure, replay, compromised-key, repudiation and session hijacking attacks. The architecture includes a high-performance cloud-focussed security protocol. The protocol efficiently utilizes the strength and speed of features such as symmetric block encryption with Galois/Counter mode (GCM), cryptographic hash, public key cryptography, and ephemeral key-exchange, and provides faster reconnection facility for supporting frequent connectivity and dealing with connection trade-offs. Embodiments have enhanced security against the above-noted attacks, and are superior to TLSv1.3 (the latest stable version among the SSL successors) in performance, bandwidth consumption, and memory usage at the server-side.