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学习笔记
Two-pharse commitment
- Pros
- The existance of commitment is public, the sender must reveal it, or will be punished.
- Can hide the value.
- Cons:
- Can not hide ether sending.
- Can not hide the existence of this commitment
- It may be vulnerable to front-runnig attack, if no nonce in the commitment.
Multi-pharse commitment
A extension of two-pharse commitment. The key idea is to add a index in the commitment
- Pros
- It provides a solution for a long-time-running commit-reveal activity.
- Cons
- Can not hide the existence of this commitment
- Can not hide ether sending.
- It may be vulnerable to front-runnig attack if no nonce in the commitment.
- Compute the commitment with index and preimage, and then compared the result with the commitment to guess the preimage of the commitment.
Submarine commitment
https://hackingdistributed/2017/08/28/submarine-sends/
https://libsubmarine/
https://github/lorenzb/libsubmarine
Key idea: Send ether to a fresh address, such as X=Hash(senderAddress, data, initial(Code))
Example code:
contract Forwarder {
address constant addrContract = 0x123;
function () {
if (msg.sender == addrContract)
addrContract.send(this.balance);
}
}
// 依赖Create2 op code. contractAddress = Hash(callerAddress, nonce, initial(Code))
// Send ether to a fresh address which is a contract, so we can retrieve the money in the address.
- Pros:
- Can hide the commitment (even the ether) by hide the tx in all of the similar tx in the commit pharse, this is a k-anoymity privacy.
- Cons:
- The existance of commitment is not public, the sender can choose to not reveal it and will not be punished.
本文标签: commitmentSchemas
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