Linked Questions

1
vote
0answers
1k views

how to get public key from metamask? [duplicate]

I'm creating a dapp. and I need my users on my website to provide public keys. As I am lazy to write a script which generates public/private keys automatically, I want to suggest an idea that they use ...
1
vote
0answers
25 views

Recover public key from message and signature [duplicate]

I try to recover a public key (not an address) from a message and a signature. I have the following message: def offer_hash(msg, nonce): types = ['bytes', 'bytes', '...
121
votes
5answers
87k views

How are ethereum addresses generated?

What criteria does a valid Ethereum address need to fulfill? Is it just a random number in hexadecimal? Or does it need to be derived in a specific way, according to some cryptographic algorithms? ...
27
votes
3answers
4k views

Is Ethereum secure against an attack by quantum computers?

Does Ethereum implement Post-quantum cryptography? Or will the network break once a malicious actor gains control of an effective quantum computer?
31
votes
1answer
16k views

What does v, r, s in eth_getTransactionByHash mean?

In Ethereum JSON-RPC I found the return is: Returns Object - A transaction object, or null when no transaction was found: hash: DATA, 32 Bytes - hash of the transaction. nonce: QUANTITY - the number ...
28
votes
1answer
13k views

Ethereum ecrecover signature verification and encryption

The question of signing and verifying signatures with Solidity has been asked in these questions, both of which I have tried to study: How can I sign a piece of data with the private key of an ...
19
votes
2answers
6k views

Is it safe to reuse Ether addresses?

I believe it's viewed as unsafe in Bitcoin because of the way transactions are signed. Is this also true for Ether addresses?
16
votes
1answer
6k views

Location of public and private keys of Ethereum account

I want to know the details about key generation and handling in Parity. The questions listed are all related, so I put them all in this one question post. When a new Ethereum account is created on ...
3
votes
3answers
2k views

How to recover public from tx signature(r,s) and verify signature?

My first question is how to verify signature using only r,s and elliptic curve paramete, and an address (which is hashed of public key, so cannot retrieve public key from the address)? Next question ...
3
votes
1answer
4k views

Is there a way to get public key using web3.js?

I know there are ways to get public key from private key using other then web3js tools (EthereumJS: How to get public key from private key and https://kobl.one/blog/create-full-ethereum-keypair-and-...
0
votes
1answer
3k views

Is it possible to derive public key from ETH address?

Goal (not asking XY question): send ETH to an address web3.js script monitoring it and acting upon transaction if msg.value > 0.1 ether then... ...encrypt a file with the public key of the msg....
5
votes
1answer
937 views

Extracting Public key from signed Ethereum message or transaction in JavaScript

I'm trying to find out how to derive a public key (not the address) of an Ethereum account by using ethereumjs-util's ecrecover method. Basically I get a transaction by hash using Web3, convert r, s ...
4
votes
2answers
777 views

Quorum Private Transactions: Why public key instead of address?

Out of a combination of curiosity and frustration, I'm trying to figure out why Quorum requires a node's public key when using "privateFor". Wouldn't it be easier to use addresses? I am wondering if ...
1
vote
1answer
671 views

Find the public key of any ethereum account (that hasn't signed a transaction)?

I need to find the public key of a list of Ethereum addresses. Is it possible to do this only with the transaction hash of one of their transactions? Per Get public key of any ethereum account the v, ...
0
votes
1answer
998 views

How to generate private / public keys?

I'm trying to create a mobile app that will 1) generate transactions 2) send them to my server as a string 3) and my server will relay that transaction to a Smart Contract on the Ethereum ...
1
vote
1answer
801 views

How do you find the public key used to sign a transaction?

I'm trying to figure out how you find the public key used to sign a transaction from v, r, and s. Before someone says so, this isn't a duplicate of Get public key of any ethereum account. That ...
2
votes
1answer
377 views

Transaction Signing & Hashing

I've been looking through EthereumJ, Trying to understand how transaction hashing and signing works. From what I can tell from the code, the signature is created by signing the hash of the RLP ...
0
votes
1answer
73 views

How to parse ecrecover parameters?

I am looking into getting the public key from ANY ethereum address (not owned by me) that has sent a transaction at least once. It seems that the most viable solution here would be to use ethereumjs-...
1
vote
3answers
84 views

Public Key of existing wallet

I have an ethereum wallet. How can I get the public key? I am getting the only private key.
0
votes
1answer
47 views

Assymetric encryption with only address

I would like to send an encrypted message to an address, without knowing their public key. If I understand ECIES correctly, in order to send an encrypted ECIES message to a party, say Bob, I need to ...