Questions tagged [private-key]

in assymetric cryptography, the private key is used to unlock, sign or decrypt

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Lost my private keys and Json or keystore file

I made an account on Ether wallet and I lost my private keys and Json or keystore file. I only have Public keys. Is there any ways to recover my account?
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What's wrong with generating private keys in this way?

Mostly out of curiosity, but if you wanted to generate your own ethereum private/public key pair, and NOTE use anyone else's code, is there anything that's wrong with doing it like this: const ...
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Is it possible to extract private key from json/UTC file?

I created an ethereum paper wallet on an offline computer. Do I need to keep both the private key and the UTC/json file or can I just keep the UTC/json file and extract the private key from it. Thank ...
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A question about EtherZero

I'm reading about the hard fork EtherZero, in particular the section about how to get ETZ money. Can someone explain me what does it means "Derive the private key from the private key-approving ...
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Very confused. Seem to have lost my private key?

I created an Etherwallet today and printed out a hard copy. I also physically wrote down both my address and private key for security purposes. I carelessly transferred coins from Etherdelta to the ...
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what is a private key in an ethereum wallet like metamask? and how do I find it?

my question is about what a private key is? and where would I find it on an ewallet like metamask?
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Is it possible to create an X.509 certificate from an Ethereum/Bitcoin private key?

We all love Ethereum/Bitcoin (i.e. EC secp256k1) private keys, because they let us sign transactions. However, browsers don't support those keys for authentication -- what they do (sort of) support is ...
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How can I convert a 24 word seed into a 12 word seed (BIP39)?

The Ethereum wallet app Blockwallet for iOS generates seed phrases with 24 words (BIP39). Using their keytools I am able to get a private key. How do I convert the private key into a 12 word seed ...
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Web wallet best practices

I'm putting together an ether/erc20 token wallet in a chrome extension but would like to follow best practices with regards to private key security. I'm using localstorage to handle login and its ...
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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 ...
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Noob: If everything is public, how do I restrict access by clients?

Lets say I want to create a protocol for storing user data for ecommerce stores. If Walmart and Macy's sign up, how do I prevent Walmart from accessing Macy's user data when they do something like ...
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Security: Creating transactions through downloadable app

Let's say I own a smart home ecosystem and a mobile app that users can use to turn on their air conditioner. Is there a way to incorporate blockchain so that no one else can turn on that air ...
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Storing and passing encrypted data to another owner

I've been thinking about this situation for quite a while and I wonder if there is a way to solve this on the public Ethereum blockchain. User A stores some data on the blockchain, encrypted in some ...
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Consolidate Batch of ETH Wallets w/ERC20 Tokens?

I have a large number of Ethereum wallets with small amounts of ERC-20 tokens in each. How can I send all of these tokens to a single ethereum wallet without doing this process manually? (it would ...
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What is the easiest way to convert mnemonic phrase into keystore file?

I have an account created with Metamask - there is 12 words backup phrase. I'd like to import that account into Ethereum Wallet. I believe that in order to do so, I need to put a keystore file into ...
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Do private keys work across chains and networks?

If I generate a private key on mainnet now, would I be able to use it at the same address on Ethereum Classic? What about testnets? In what cases would the keys not give the same address on different ...
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Import unencrypted private key into ethereum wallet [duplicate]

I have an ETH adress. I have an unencrypted private key. How to import these in MyEtherWallet? Or another Desktop Ether wallet? Don't answer with an howto for Mist or Geth, because I use ...
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How does a relying party learn a PageSigner server's public key?

Hoping for some insight Into to page signing... I understand that: https://tlsnotary.org/pagesigner.html can provide proofs that a specific web page was returned from a third-party TLS-protected ...
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How was an address like 0x0000000000000000000000000000000000000001 generated?

How were the private keys for addresses like 0x0000000000000000000000000000000000000001 generated in ethereum? Surely they weren't made at random? Please let me know. How is it valid?
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Programmatic way of generating and extracting private address using Geth

I'm not sure why this is so tough but I can't find easy answer to do what I'm trying to do, which is following: Generate a new ETH address using passphrase using Geth (I can do this using "geth ...
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Does knowing half private key provide any useful information?

I have a private key and I want to store a paper version of it. I would like to split it in 2 equal parts (first 32 numbers and last 32 numbers) and store them in 2 different locations. Let's assume I'...
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Does a smart contract have a private key? [duplicate]

Does a smart contract have a private key ? Can it send the result of exucuting his code to the other nodes ?
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Sign Ethereum contract transaction w/ web3 on back-end?

How do I directly import via Private Key an account to the web3 library so it can get called by functions like myContract.methods.myMethod().call() & myContract.methods.myMethod().send()? I am not ...
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Why geth use scrypt for key derivation?

As I understand scrypt was designed to be computationally intensive, so that it takes a relatively long time to compute. For what geth need this? And why it does not use, for example, SHA-256?
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Is it Safe to Share the Wallet Keystore File Without Password?

There is an ICO that asks for ethereum keystore file, which is unusual for me as far as ICOs go. Even though it does not looks like it contains private key and password it still feels unsettling. Is ...
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Why shouldn't my application handle private keys for my users?

I'm in the early stages of planning the architecture of our Dapp, and one of my concerns is the barrier to entry of requiring the user to already be using Metamask or Mist. My understanding so far is ...
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How (without libraries) can I get the public address from a private key?

I want to know a way to know the public address used for funds transfer from the private key. (As myetherwallet do when you get your wallet info by entering your private key) I don't care with wich ...
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What is the difference between a private key, password, brain wallet, recovery passphrase, and wallet?

What is the difference between a private key, password, brain wallet, recovery passphrase, and wallet, if any? Is there any connection between these?
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Can I use my private key and pw to access MyEtherWallet on a new CPU? If so, how?

My hard drive pretty much melted because Dell laptops suck. I saved my private key and would like to access myetherwallet from a new computer. When I enter the private key on its own as a "Keystore ...
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Brute-forcing private keys

In this post by an Ethereum engineer taken from the Ethereum wiki about brute-forcing private keys, he writes: "Public keys are sized so that, absent a breakthrough in solving the discrete ...
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Can an Ethereum key generated on a laptop be brute-forced by someone else because of low entropy?

I read this and this tweets. Though, I understand that this issue occur because some people use the same private key mentioned in a blog/forum. But, on the first tweet, people were talking about the ...
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Does Ethereum have the “private key exposed on spend” problem?

Is it the case that Ethereum requires the spender to provide the private key for an address so that it can prove ownership when spending ETH? If so, is there some mechanism where each spend actually ...
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Can a smart contract safely store and use private keys? [duplicate]

Is there a way for a smart contract to safely store (and maybe use) private keys from other blockchains?
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Lost private key (keystore file)?

I am new in mining, so here's my story: I installed Linux, downloaded geth and Claymore DualMiner. Then generated a wallet address with geth (I was asked a passphrase) and started mining ETH ... ...
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gift card - private key - how to redeem?

Someone gave me a gift card with an address - 0X ... - and a private key - list of words. I have used various wallets but I am unsure what I an meant to do with this. How from the address alone and ...
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Console application for generating addresses and private keys

Is there a Windows console application that can generate addresses and private keys as output to the console window?
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725 views

How public key is recovered for signature verification?

I see address everywhere in ethereum but not public key, and I understood that address is Keccak-256 of pubkey, and I do not think it is possible to derive pubkey from address. So, my question is ...
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On Ubuntu, I can't build sha3sum

I was following this article. When I saw that I've to have this keccak256-sum, I moved to this GitHub repo. But, when I am building it, it's giving below issue. $ make cc -Wall -Wextra -pedantic ...
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Parity - export private key for cold storage

I'm trying to store some Eth I have in Parity into cold storage. Since I have no guarantee that Parity will continue being supported several years/decades in the future, or that the seed passphrase ...
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MyEthereumWallet got stolen

2000 tenx tokens were stolen from MyEtherWallet after i transferred it. Luckily i didn't transfer everything, i wanted to test it first. I was looking for a safe wallet and decided to go ahead with ...
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How do I access my ether from my unencrypted private keys?

I previously used Jaxx, where I stored some Ether. I have now uninstalled Jaxx, but would like to access my Ether in any way possible. I don't have the Jaxx mnemonic as it was never made clear that I ...
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Can I import the account from MyEtherWallet to other wallets?

I generated a password protected Ethereum account on MyEtherWallet with the Create New Wallet button. If MyEtherWallet stops working, will I be able to access this account using another software or ...
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Are HW wallets better than password managers?

A short premise: HW wallets and password managers have surely different scopes, but they both seems to cover what I'm interested in, which is securely storing a private key. Hardware wallets: a ...
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Convert a Bitcoin private key into an Ethereum address

I'm currently using the lightwallet.js for ethereum and it seems to only accept a mnemonic seed to generate an ethereum address. I want to be able to use my Bitcoin private key to generate an ethereum ...
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How to get a private key of an encoded account which was created with geth?

I have next problem: I have created an account with password via geth. Right now I need to get private keys (or somehow retrieve my eth) without starting a peer-to-peer node. Is it possible to ...
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I think I owned some ether. Where can I find my keys?

I started messing around with the Ethereum geth client when the Ethereum main network was just launched. I remember I bought some ether for maybe €30 and then I kinda lost sight of the whole thing. ...
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How are blockchain apps secured?

I would like to know how does the process of authentication work and how are the private keys used for signing transactions? For eg while using email : We log-in to our accounts and send as many ...
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I need help with signatures

So, for my studies, I am supposed to interact with a contract function that has the following built in condition: if (ecrecover(_h, _v, _r, _s) == msg.sender && _h == sha3(this)) I am ...
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RangeError: private key length is invalid

I am trying to sign a message using the following code:ethJsUtil.ecsign(ethJsUtil.sha256(msg),new Buffer('0x...')) Where 0x... is my private key taken from MyEtherWallet. It gives the error in the ...
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What is the Private Key?

I am trying to understand what is the private key in Ethereum. Help please. Private key = the address? Private key = the password/passphrase? Private key = the text seen when we open the file in the ...