The repository also contains specifications of many RLPx-based application-level protocols:. We aim for an integrated system of orthogonal parts, implemented in multiple programming environments. The system provides discovery of other participants throughout the Internet as well as secure communication with those participants. The network protocols in devp2p should be easy to implement from scratch given only the specification, and must work within the limits of a consumer-grade Internet connection.
We usually design protocols in a 'specification first' approach, but any specification proposed must be accompanied by a working prototype or implementable within reasonable time. The libp2p project was started at about the same time as devp2p and seeks to be a collection of modules for assembling a peer-to-peer network from modular components. Questions about the relationship between devp2p and libp2p come up rather often. It's hard to compare the two projects because they have different scope and are designed with different goals in mind.
That said, both projects are very similar in spirit and devp2p is slowly adopting parts of libp2p as they mature. Skip to content. Star Ethereum peer-to-peer networking specifications stars forks. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Branches Tags. Could not load branches. Could not load tags. Latest commit. Git stats commits. Failed to load latest commit information. Aug 1, Nov 4, The attacker can simply XOR the two ciphertexts and the keystream will cancel out, yielding the XOR of the underlying plaintexts. In the case of RLPx, the "IV", which is the initial counter state, is set to zero for both the initiating peer and the receiving peer.
Since the keystream is a function of the Key and the counter state, which is identical for both the receiving peer and the initiating peer, the peers will re-use the same keystream. Now that we know the peers are re-using a keystream, we want to formulate a practical attack on the protocol. A few questions come to mind initially. What interesting protocol messages are there for a passive attacker?
Do the peers reuse their keystream with every message that they send each other? How can we separate the individual plaintexts after learning the XOR of the two plaintexts? The interesting protocol messages to us, as a passive adversary looking to learn interesting things about the Ethereum network through p2p network traffic, is the core ETH protocol which handles things such as relaying transactions, new blocks, block headers, etc:.
This is a simple approach that exploits the fact that it is easy to compile a list of likely known plaintexts in this case, since the application is a blockchain network and the relayed transactions will very likely be recorded on the ledger in short order, assuming they are valid. Since the network is permissionless, an attacker could also actively inject known plaintexts which are then gossiped around the network, enabling them to decrypt more unknown plaintexts.
We exploit the flaw using techniques commonly employed against repeated Counter mode nonces. View all posts by Ava Howell. Skip to content. NewCipher s. MAC if err! AES if err! AES, conn: conn, enc: cipher. NewCTR encc, iv , dec: cipher.
Practical Exploitation: A Deanonymization Attack Now that we know the peers are re-using a keystream, we want to formulate a practical attack on the protocol. We can then conceive of a simple attack: Assume a position on the network such that we can observe many Ethereum peer-to-peer connections. Compute the XOR of the ciphertext messages sent by the initiator and receiver for each connection. Compile a list of possible plaintexts, by compiling recent public blocks, block headers, and transactions into their correct message format.
Battery wear level data is simple to retrieve and track via app and it does not require time-consuming integrations which obviously would take too much time for one weekend. As we were only two people writing actual code, we decided to keep iOS app separate from Ethereum client logic, as there was no fast way to use some external library to connect app directly to Ethereum. We came up with a solution to implement a middle layer between Ethereum and iOS app.
A Node. JS server, which will interact with smart contracts in Ethereum, issue new accounts and store account information. Main purpose for it was to act as a forwarder with as less logic as possible. For faster testing and demonstration we implemented and deployed forwarder to Azure, where backend was connected to a TestRPC Ethereum client running on the same Ubuntu server as a forwarder.
I would like to share some parts of the smart contract solidity code, which was written to showcase the peer to peer investment and insurance part of the contract. Peer to peer investment part which enables people to invest Ethers into the battery insurance product:. Small part of the insurance contract, which calculates the price based on certain parameters, registers the policy and accepts the payment in Ethers:.
At the end of the weekend we had an iOS application where users can check their battery wear level, get the price for the battery insurance, insure, initiate the claim and get paid. The best part is that everything is fully autonomous and connected to Ethereum blockchain. Therefore, it does not need any intermediary and people can insure, invest and get paid without any insurance middleman. We got a huge interest about our app during that weekend.
Therefore the next step is to connect the application to Ethereum Ropsten Testnet. Also, we found out that Android allows to retrieve more data about battery and do that in a legal way. New designs are ready, development is in progress, hype within the team is huge, so we have all the needed components to make it happen.
Please take a look at our github: Aigang. Network Github. That said, both projects are very similar in spirit and devp2p is slowly adopting parts of libp2p as they mature. Skip to content. Star Ethereum peer-to-peer networking specifications stars forks. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. Branches Tags. Could not load branches. Could not load tags. Latest commit. Git stats commits. Failed to load latest commit information.
Aug 1, Nov 4, Mar 31, Apr 9, Apr 14, Jan 18, Feb 9, Sep 20, Apr 12, View code.
huge.crptocurrencyupdates.com › doi › full › nem. Ethereum uses the underlying blockchain network to implement decentralized distributed data computing and storage. This decentralized mechanism can effectively. devp2p is a set of network protocols which form the Ethereum peer-to-peer network. 'Ethereum network' is meant in a broad sense, i.e. devp2p isn't specific to a.