Extract public keys from Ethereum messages: Understanding the relationship between P2PKH addresses, digital signatures and public keys
The private key structure of Ethereum (P2PKH) is a crucial aspect of his cryptographic mechanism. In this article we will deal with the extraction of public keys from a message, a digital signature and a P2PKH address.
The basics: Ethereum’s private key format
In the ETEREUM network, each account has a unique private key (P2PKH), which is a 256-bit version of the seed phrase of the user of the wall pocket. This seed phrase is used to derive other keys, including the public key and the digital signature.
The relationship between P2PKH address, digital signature and public key
If you sign a message using the digital signature function from Ethereum, the resulting edition (digital signature) contains information about your private key. The digital signature is generated by combining the public key of the sender with the address of the sender together with other cryptographic parameters.
The process includes:
- sign : You use your private key to generate a digital signature for the message.
- compression and coding : The digital signature is compressed and encoded using a specific algorithm (e.g. base64).
- Recipient Public key : Your P2PKH address is used to derive the recipient’s public key.
Extract the public key
Now let’s examine how to extract the public key from a message, a digital signature and a P2PKH address:
- Digital signature
: The digital signature generated by your private key contains information about your public key.
- P2PKH address : Your P2PKH address is used to derive the recipient’s public key.
- Public key (optional)
: If you want to extract your own public key, you can use the following formula:
Public key = (digital signature XOR message) ^ Public key derivation Function
Here is a high -ranking example with the function of Ethereum ETH_GetTransaction Recept:
`JavaScript
Const Transaction = TransactionFactory.Createtransktion (
{
By: ‘0x’, // sender address
to: ‘0x …’, // recipient address
Data: Messagedata, // News Nutz load
Nonce: Txnonce,
Gasprice: Transactiongasprice,
Gas limit: Txgas limits,
}
);
Const Signature = Transaction.GetTransaction Receipt (). Signature;
Const Publickey = (Signature ^ transaction.Getoutput (1) .data) .tostring (‘hex’);
console.log (publickey);
`
Important notes
- This is a simplified explanation of the process. In reality, Ethereum’s private key format and cryptographic algorithms are more complex.
- The process of the public key section assumes that you will have the necessary authorizations to access and access the recipient’s P2PKH address.
- Note that extracting your own public key can be sensitive information because it contains sensitive user data (e.g. item pocket balance sheets).
While the private key format from Ethereum contains a clear combination of P2PKH address, digital signature and news protection load, extracting the public key is not easy. By understanding the relationship between these components, however, you can gain insights into the cryptographic mechanisms of Ethereum and may use this knowledge to develop custom applications or analyze existing data.