Verifying safe signatures at Ethereum: a complex problem
As the decentralized development of application (DAPP) continues, one of the most critical concerns is to ensure the safety and integrity of the user experience. In particular, checking the security of a signed message is essential to prevent unauthorized access to confidential data or applications. This article will delve into the complexities around this problem, focusing on the challenges associated with the verification of Ethereum’s intelligent contracts.
The problem: recovering signatures
When a user signs a custom message using their private key, it generates a digital signature that proves that they have control over the signed data. However, the recovery of the original data is a separate process. In most cases, it is not feasible to recover the exact signature used to sign without the sender’s private switch and the encrypted or decrypted data.
Verification of Ethereum’s intelligent contract
In Ethereum, intelligent contracts are executed in blockchain, which means that any actions performed by users are unchanging and proof of violation. This leads to a unique challenge when it comes to checking the user’s signatures.
When a user signs a message using their private key, the transaction is transmitted to the network, where it is performed by us. Blockchain’s resulting state includes all transactions, including any signed messages. However, as the signature itself is not stored in the chain, there is no way to recover or verify it directly.
The Solution: Subscriptions and Recovery
To solve this problem, Ethereum presents the concept of «recoverable» signatures. These are digital signatures that can be recovered by resolving a complex Mathematical Break (ie decoding the encrypted data message). However, this requires significant computational power, which can lead to problems with high latency and scalability.
A more advanced approach: Digital Subscriptions of the Ellic Curve
Another approach is to use digital subscriptions of the Elict curve (ECDs), which provide faster recovery times than traditional ECDSA. In an ECD -based system, the subscription itself includes a private key and an associated public key that can be used to check the signature.
Using Web3.Js for Ethereum Smart Contract Verification
To implement this solution using Blockchain and Smart Ethereum contracts, you will need to use libraries like Web3.JS, which provide an interface for the Ethereum network. You can use these libraries to interact with smart contracts, recover signatures, and store them safely.
Here is a simplified example of how you can implement this using web3.js:
`JavaScript
CONST Web3 = Requires (‘Web3’);
// Initialize the web3 instance
CONST Web3 = new Web3 (Window.ethereum);
// signs a custom message using the user’s private key
Signmessage of asynchronous function (userprivatekey, custommessage) {
CONTT Account = Wait Web3.eth.getaccount (userprivatekey);
CONST SIGNURE = awaits account.sign (custommessage);
Return signature;
}
// Recover the original signed data from blockchain
Asynchronous function recovered (transacthonhash, signature) {
// Use the hash and the transaction signature to create a break -up that solves the original message
SOLUTION CONST = Web3.eth.GettransactionReceipt (Transactionsh);
CONST CODEDDATA = SOLUTION.DATA;
// Decrypt the coded data using the signature
CONST DECRIPTEDMessage = Web3.eth.deCrypt (Codeddata, Signature);
Return decriptographing magic;
}
`
Conclusion
Checking safe signatures on Ethereum is a complex problem that requires careful consideration of scalability, safety and usability. Although recoverable signatures provide an alternative to traditional ECDSA -based systems, they also come with their own set of challenges.
Using web3.