Hybrid P2P File Sharing Security Protocol
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hybrid peer-to-peer networks face challenges in providing efficient security protocols for data integrity and proof-of-service, particularly in large file sharing scenarios, where existing methods often result in high bandwidth overhead and computational demands, and lack reliable verification mechanisms.
Innovation Solution
A lightweight security protocol utilizing a local hash tree and digital signatures, where a server signs the root hash value, and peers verify block integrity using a subset of hash values, with acknowledgments and block keys ensuring data integrity and proof-of-service, reducing bandwidth and computational overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the server provides a digital signature of the entire file, then data integrity is ensured, but bandwidth consumption increases significantly when retransmission is needed
Solution Approach 1:
The patent divides the file into multiple blocks and provides separate digital signatures for each block instead of signing the entire file. This segmentation allows selective retransmission of only corrupted blocks rather than the entire file, significantly reducing bandwidth consumption when retransmission is needed while maintaining data integrity verification capability.
2Reliability
If the server signs each data block individually, then data integrity verification is enabled, but computational overhead increases due to decryption requirements
Solution Approach 1:
The patent extracts only the essential verification information (hash values and signatures) from each block and transmits them separately. The client can verify integrity using these extracted components without needing to decrypt and process the entire block, thereby reducing computational overhead while maintaining verification capability.
3Use of energy by moving object
If a superblock containing hash values for all blocks is used, then computational demands are reduced, but startup latency increases due to required reception of the entire superblock
Solution Approach 1:
Instead of requiring the client to receive and process a complete superblock containing all hash values before starting file download, the patent segments the verification data into block-level units. The client can begin downloading file blocks immediately while receiving and processing verification information incrementally, thus reducing startup latency while maintaining low computational demands.
4Reliability
If proof-of-service mechanisms are implemented in peer-to-peer networks, then service verification is enabled, but system complexity increases
Solution Approach 1:
The patent implements proof-of-service mechanisms that leverage existing cryptographic primitives (digital signatures, hash functions) already used for data integrity verification. By reusing these universal cryptographic building blocks for both integrity verification and service proof, the system enables reliable service verification without proportionally increasing complexity.
Data Source
AI summary
In a hybrid peer-to-peer file sharing network including a receiver peer and a provider peer, the receiver sends the provider a ticket [710] obtained from a server authorizing the receiver to obtain a data object O. The receiver obtains a root value of a hash tree for the object, verifies its digital signature, and sends the provider peer a request for a block of data object O and a request for a corresponding set of hash values from the hash tree [714]. The receiver receives from the provider peer the block of O and the corresponding set of hash values of the hash tree [716] that do not contain any hash value in the local hash tree. The receiver sends the provider an acknowledgement of receipt [718], obtains a block key from the provider [720], decrypts the block, verifies the integrity of the block using the subset of hash values and the local hash tree for O, and updates the local hash tree by adding the subset of hash values to the local hash tree, as well as any newly calculated hash values [722]. The provider may submit to a server the acknowledgements as proof of its service to the receiver.