Questions tagged [encryption]
Questions related to the encryption in Ethereum
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questions
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storing encrypted data on ethereum and using encrypt decrypt offchain
All data stored on public blockchains like ethereum is available for public viewing.
All there any libraries, frameworks or solutions, for storing encrypted data inside smart contract data structures.
...
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Minimum and Maximum Values Returned by keccak256
In the statement:
uint256 x = uint256(keccak256(abi.encodePacked(valuesToEncode)));
What’s the minimum and maximum possible values for x?
When I looped random valuesToEncode the smallest resulting ...
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0answers
20 views
Malformed private key when attempting to sign transaction
I am attempting to sign a transaction but I get a malformed private key.
The code below is example code that I have cobbled together.
main.go
package main
import (
"bytes"
"...
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0answers
26 views
Curious about the Math that makes Blockchain/Ethereum work ! Any good resources to learn it?
A bit of a background about me ; Computer Engineer but during my studies i didn't dive too deep into the maths , especially the crypto maths that makes the blockchain and cryptography work
looking for ...
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1answer
32 views
Best practice to store private key for containerized apps in the cloud
I am a crypto investor. I am staking a coin but the smart contract requires the user to claim and restake the rewards by transacting a smart contract function every 24 hours. Currently I am doing it ...
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1answer
70 views
Restore from ethereum keystore file results in an unusable private key
I have a keystore file from an old ellipal wallet with some eth with it.
The corresponding password is correct (I can use it to display the private key and keystore in it) and I can also run the ...
0
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0answers
33 views
Encrypt and decrypt a string in solidity
I would like to write a function to encrypt a string by decreasing it's length then it will be possible to reach the original one too ( two way encryption ).
I don't care about the security. my ...
0
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1answer
16 views
Is there a way to hide parameters in a smart contract?
Imagine we have a very simple contract which pays 1%, 1.2% or 3%(very special fee) on an anniversary basis.
But we don't want the different holders to know who are on what fee rate of others.
...
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1answer
77 views
Public/Private Key encryption/decryption with wallet
The following case:
There is a dApp in place, connected with a wallet (e.g. Metamask). Wallets usually don't offer public/priate key encryption/decryption.
I want to decrypt a message for the owner of ...
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1answer
44 views
How to securely decrypt game data inside smart contract
I have a problem I haven't been able to figure out, as follows: Suppose I have a game running on the blockchain (a solidity/smart contract game) where there are a limited number of plots of land that ...
0
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2answers
26 views
Is there a bruteforce uses random private keys to find spesific public key as a lottery?
I actually know how private key and public key works. But I don't know how to brute force private key. In calculation it is impposible. But with luck anything is possible. What I mean is this: If we ...
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1answer
60 views
Is it possible to intercept a message sent to a smart contract (i.e. a guess for a quiz) and send it as your own before the original reaches it?
I'm trying to write a smart contract that can be generated by an individual given ETH/ERC-20 value to lock and a secret passphrase (hashed). Then, given that another individual sends the passphrase in ...
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20 views
Is it possible to use ethereum smart contracts for cryptocurrency exchange
I know ether can easily be accepted by smart contracts, however, would it be possible to exchange ether sent to the contract for another cryptocurrency? Wouldn't a private key need to be stored in the ...
0
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1answer
64 views
How to securely send a message
I was wondering that can I encrypt a string, send it to a smart contract, for that to be decrypted only by some address's private key?
e.g "Hello" to be encrypted in a way that it would be ...
1
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1answer
808 views
Can you get the seed phrase of a HD wallet from the private key of one of the wallets?
Let us say I have a HD wallet. Can I get it’s seed phrase from the private key of one of its wallets?
Also are seed phrases just easy to remember private keys? If so does that mean that from the seed ...
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0answers
17 views
Hiding Function Call Arguments
I am trying to create a smart contract for public tenders. I have a condition: bidders cannot see others' offers before tender ends. The contract accepts bids via a function.
I have two major problems:...
2
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1answer
279 views
ERC721 Metadata encrypted by owner's public/private key
Is there a good way to keep personal data (e.g. name, address , etc.) in the ERC721 metadata JSON, encrpyted with the public key of the owner, so that only the owner can decrypt it with his/her ...
3
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1answer
263 views
Why doesn't web3.js/metamask have a decrypt with private key function yet?
For smart-contracts and dApps it is in many cases important to put encrypted data on the blockchain, encrypted with the public key.
I have been searching, but there doesn't seem to be a way to decrypt ...
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0answers
82 views
What is the best practice when storing a custodial wallet with node.js and mysql?
I'm using Adonis.js v4 (it's node.js) and mysql (on RDS) as my database.
I need to create an ethereum wallet for each of my user's and I need to make transaction on their behalf with their wallet (...
1
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1answer
79 views
Verifying ETH Deposit Contract signatures using Chainsafe BLS library
I am attempting to verify BLS signatures using the Chainsafe BLS library. I am attempting to independently verify signatures associated with deposits to the ETH Deposit Contract. In order to test that ...
3
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0answers
74 views
Homomorphic encryption with Ethereum compatible chains
Are there any blockchains or even Ethereum mainnet contracts that would offer homomorphic encryption primitives and example code?
A sample use case would be homomorphic secret sharing that is needed ...
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1answer
880 views
Can we decrypt a message by using private key through Metamask
Say I have a hash of a file which is stored on IPFS.I want to encrypt the hash with public keys of few people.
How can I do the encryption of the hash (encrypted hash should be stored on smart ...
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2answers
83 views
Store encrypted data on-chain VS on cloud
So, I am currently doing research for a project and an interesting question was born. If I have data that I want to store encrypted, why to choose blockchain instead of a cloud provider? Since the ...
4
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1answer
150 views
What is the v part of transaction signature?
If I understand correctly when we send a transaction, we send an unsigned part m and a signature consisting of v, r, s. Each node verifies the signature by checking:
hash(m,r) * publicKey + r = s * ...
2
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0answers
54 views
Confidential data encryption on blockchain
I already built a supply chain that is able to collect product information on Ethereum. Now, that data can be confidential, but I still want to do Matrix calculations on it. I came across homomorphic ...
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1answer
61 views
Why is privateKey padded before secp256k1 signing?
I am checking how the Ethereum handles signing but I can't figure out why the math.PaddedBigBytes is necessary:
func Sign(digestHash []byte, prv *ecdsa.PrivateKey) (sig []byte, err error) {
if ...
1
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1answer
254 views
Is it possible to have multiple private keys for a single public address? [duplicate]
Since the ratio of all possible digits (please correct my math if I am wrong) of a public key versus private is:
1/79228162514264337593543950336
for public (40^16): 1 461 501 637 330 902 918 203 684 ...
0
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1answer
774 views
How can I encrypt a file using an ethereum public address and decrypt it with the private address?
The expected outcome is very simple:
Users will send their ERC20s to a smart contract. Depending on the amount, each user will get a file specifically created for them. I want to distribute that ...
0
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1answer
46 views
Data encryption
Since all data on the Blockchain is public. Presume I have multiple users submitting data which I want to hide, is there a way I can encrypt that data on the Blockchain ?
Or do I have to encrypt off-...
2
votes
1answer
103 views
Algorithm used for symmetric key encryption by quorum
What are the symmetric key encryption techniques used by the enclave in quorum to encrypt the payload? The documentation of quorum mentions that the enclave uses a symmetric key to encrypt the payload ...
0
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1answer
145 views
Asymmetric encryption with master Key
Is there any way i can derive private and public keypairs from a Master Key? The Master Key should be able to decrypt every encryption made with the generated Keypairs.
to explain a bit further i ...
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1answer
213 views
How to store and encrypt Keys?
I am developing chrome extension like metamask for the private Chain. I have generated the keys and using localStorage to store the Keys. But I am not sure whether I am going correct or not for ...
0
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1answer
285 views
Storing encrypted data and decrypt on-chain
The idea was to store the encrypted number of tokens,and when user was sending his private key, smart-contract would decrypt the data and perform an action of sending tokens to someone else. The catch ...
3
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1answer
846 views
Decrypt message on-chain
I want to store some data in smart contract and then decrypt it on chain. Pseudocode:
contract EncryptedData {
bytes data;
string public decryptedData;
constructor(bytes data_) public {
...
4
votes
2answers
622 views
How to encrypt a file with multiple public address?
Can I encrypt a file with multiple public address such that each of them can decrypt the file using their private keys?
Thus achieving a system to securely store file on IPFS which can be accessed by ...
0
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1answer
49 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 ...
0
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2answers
110 views
Encryption and Decryption when transmitting data
If I was sending data to a smart contract, do I need to encrypt it before transmitting and decrypt it in the smart contract? Or is this done automatically?
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2answers
391 views
Blockchain Smart Contract EHR
I'm trying to do a miny EHR(Electronical Health Record) with Smart Contracts where I have a Pacient Contract.
The problem is that in solidity everything is public, even the private variables, so I got ...
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1answer
252 views
How to get decrypted transaction data in quorum?
On Quorum_Node1 I am sending a transaction with privateFor: parameter as follows:
eth.sendTransaction({from: eth.accounts[0], to: "0xca84356...9a3d0ccf92b8e",
data: web3.toHex('sample message for ...
2
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2answers
569 views
Offchain encryption in Ethereum dapp
Im wrting a dapp which holds / manages sensitive data which might need to be encrypted and decrypted and push again into chain.
I know it is not safe to encrypt data in smart contract,which is why Im ...
0
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2answers
85 views
Storing private data that will be decrypted by a smart contract
Another private data problem!
I would like to store some data in a Smart Contract, encrypted so nobody can see it upon some specific condition (time, or whatever).
For instance, after one year, this ...
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2answers
3k views
Encrypt data using public key
I have three data fields in a form which will return a string. I would like to hash the value of these three strings and store it in the blockchain. However the data in these three strings is ...
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1answer
2k views
How to encrypt a string with a smart-contract private-key and decrypt that offline
Say I want to make a smart contract that is able to save secret messages (strings). The messages should be stored only in encrypted form so no one can read them, but should be decrypt-able by a couple ...
0
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1answer
84 views
Is Data Stored on Ethereum encrypted or only RLP encoded?
Is Data Stored on Ethereum encrypted or only RLP encoded? If data is not encrypted, is there some way to secure and encrypt it using AES encryption algorithm in cipher block chaining (CBC) or XTS mode ...
3
votes
1answer
367 views
geth inter-node communication (devp2p/rlpx) encryption
I am currently analysing the encryption mechanisms used in geth.
Currently I have gathered the following information from the source code (https://github.com/ethereum/go-ethereum/blob/master/p2p/rlpx....
0
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1answer
106 views
what encryption does myetherwallet use?
I am trying to use the encrypted ethereum private key created by myetherwallet within my application. Everytime I need to send money, I will input my password so that my application can decrypt it and ...
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1answer
459 views
Encryption with BIP39 specification secp256k1 keys?
We are making a system where users can share files with other people but nobody should be able to figure out that all these different files belongs to same user on blockchain.
these are the steps we ...
4
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3answers
4k views
How to use mnemonic to recovery my ethereum wallet
I use web3j to create my ethereum wallet.the Code just like down
import org.web3j.crypto.Bip39Wallet;
import org.web3j.crypto.Credentials;
import org.web3j.crypto.ECKeyPair;
import org.web3j.crypto....
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1answer
253 views
Understanding the UJO Smart Contract
I have trouble understanding the underlying mechanism for the UJO Music Portal, that helped Imogen Heap sell her album online. There is a smart contract that enables people to pay using ETH with ...
0
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1answer
63 views
In ethereum if i submit any data is it stored in encrypted format? [closed]
Does Blockchain perform encryption/decryption of data?How and where is data stored in ethereum case.
