Questions tagged [privacy]

Questions related to data and smart contract privacy. For questions related to user anonymity, use [tag:anonymity].

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20
votes
2answers
2k views

Private info in an Ethereum smart contract

Is there any way to store info on a smart contract, and keep it a secret? If a contract has a state variable that is not public like: contract foo{ uint public publicVariable; uint notPublic;...
22
votes
1answer
2k views

What are effective techniques to encrypt/decrypt data stored in a smart contract?

Rather than sending and storing plain text in a smart contract, the use case objective is to encrypt first and then subsequently access the data and decrypt at the point of use. What is the most ...
6
votes
1answer
2k views

Store secret data in contract [duplicate]

I know about the general open / trustless protocol of storing transactions. How would I approach a scenario here where I want to store some data in a contract on deployment, to later be retrieved by ...
9
votes
2answers
5k views

Solidity functions - private visibility

Is the following function parameter (string name) only visible to the owner contract itself? function myFunction(string name) private returns (bool) { return true; } So nobody can read / see ...
15
votes
4answers
1k views

How to increase my privacy on Ether accounts?

What would be the best way, if any, that one could change their address/account in order to make themselves unknown or hard to identify by people they traded with? More specifically, if I send ETH to ...
9
votes
1answer
621 views

What data will zk-SNARKs protect?

Implementing zk-SNARKs is planned in Ethereum roadmap, what data will be obfuscated? transaction sender and receiver? data in transactions? data stored in contracts? variables and methods in ...
11
votes
3answers
4k views

Is there any way to hide a transaction?

Is there any way to hide a transaction on the Ethereum blockchain? Some blockchain have protocols that implement this by default, like Monero and Zcash. Is something similar possible on Ethereum?
2
votes
2answers
823 views

Issue with New version of Metamask: Remix cannot detect the Metamask address

I have just installed Metamask version: 6.3.1 Now in Remix, the address of my account in metamask is not detected. The account box in remix remains always blank now (see picture below). Note that I ...
12
votes
3answers
876 views

How can we write a contract that relies on hidden information?

Since a smart contract can only access (public) information on the blockchain itself, how can I make a smart contract that relies on hidden / secret information? Are there any workarounds in this ...
5
votes
1answer
281 views

Is it possible to run a client behind an onion address?

It is possible to run a bitcoin client which only connects to onion nodes in the TOR network, like that: ./bitcoind -onion=127.0.0.1:9050 -onlynet=tor -externalip=ssapp53tmftyjmjb.onion Is something ...
26
votes
3answers
4k views

zk-SNARKs vs. Zk-STARKs vs. BulletProofs? (Updated)

zk-SNARKs, Zk-STARKs and BulletProofs are three major zero knowledge proofs to provide privacy for the blockchain technology. If we can compare them, (1) Bulletproofs and Zk-STARKs require no ...
4
votes
1answer
487 views

Ethereum facilitation for zk-SNARKs

There has been a lot of talk about leveraging zk-SNARKs to bring privacy features to the Ethereum Blockchain. My question is, how is Ethereum facilitating the verification of zk-SNARKs at the moment, ...
5
votes
2answers
340 views

Updated: Is it possible to hide the sender or receiver of transactions by “zk-SNARK” or “Bulletproofs”?

To support the user privacy, is it possible to hide the sender address or receiver address of transactions by "zk-SNARK" or "Bulletproofs" ? Or we’ll be able only to hide the value that is mapped to ...
13
votes
4answers
1k views

With a ring signature mixer, will Ethereum transactions be completely anonymous?

I was reading the Serenity PoC2. The part quoted below grabbed my attention. Does it imply full anonymity for Ethereum transactions should I decide to use the ring signature mixer? Ring signature ...
8
votes
3answers
1k views

Is there a point to hide Ethereum nodes with TOR?

From a privacy perspective, is there any point in trying to torify ethereum nodes? I know there's a script to do that in bitcoin, although doing so may ironically made the bitcoin node more ...
6
votes
1answer
934 views

Accessibility of public variables

If I have a public state variable, does this mean that other contracts can access or even change its value? I have made a cryptocoin from here and all variables are declared as public, so I am ...
5
votes
1answer
1k views

Ethereum Authentication/Authorization

Lately I've been thinking about how to integrate Ethereum with other non-Ethereum systems. Would it be a bad idea to import and Ethereum keypair into an external (mobile/desktop) application, which ...
3
votes
2answers
248 views

Is there a way to privately send ether?

Is there currently any way to privately send ether? If not, are there any plans in the future to implement any privacy features?
8
votes
2answers
345 views

When a smart contract is deployed, is its source code publicly viewable?

When a smart contract is deployed to the blockchain, is the source code then publicly viewable to all participants? For example, what you see here in Etherchain. I am aware that there are some ...