GingerWallet is the fork in the wallet WasabiThe wallet of former employees who worked at zkSNACKs after its closure Wasabi Coinjoin Coordinator, received a report of vulnerabilities from developer Drkgry. This The vulnerability allows the complete deanonymization for user inputs, and the outputs of a coinjoin. This gives a malicious coordinator the power to completely undo privacy gains by using a active attack.
Wasabi The new version 2.0 completely redesigned the way that Wasabi Coordinated coinjoins moving from the Zerolink The framework uses fixed denomination mix amounts. Wabisabi A protocol that allows dynamic multi-denomination amounts. This The process required switching to dynamic credentials from blinded homogeneous tokens in order to get your coins back. Keyed Verification Anonymous Credentials (KVACs). This would allow users to register blinded amounts that prevented theft of other users’ coins without revealing to the server plain-text amounts that could be correlated and prevent linking ownership of separate inputs.
When When users start participating in a particular round, they ask the coordinator server about the details of the round. This returns a value in the RoundCreated parameters, called maxAmountCredentialValue. This The highest-value credential that the server can issue. Each The value entered here will identify the credential issuing.
To Multiple methods to save bandwidth were not implemented for the clients. This allows a malicious coordinator to give each user when they begin registering their inputs a unique maxAmountCredentialValue. In This value can be used by the coordinator to determine which user is communicating the next time it sends a message, or registers an output.
By “tagging” each user with a unique identifier in this way, a malicious coordinator can see which outputs are owned by which users, negating all privacy benefits they could have gained from coinjoining.
To It is my understanding that Dr. Gry, who discovered the information independently and revealed it to me in good conscience, was not present when the team designed zkSNACKs. Wabisabi This issue is something we are all very aware of.
“The The second reason for using the round hash to protect clients is that it will prevent them from being tagged by the server. To do this, all credential parameters and round metadata must be identical across all clients. to ensure that the server isn't trying to influence clients to create some detectable bias in registrations).”
It The 2021 was introduced by Yuval KogmanThe 2021 release of, or nothingmuch as it is also called, was another big hit. Yuval The developer of the Wabisabi One of the designers actually specifies the entire protocolIstván András Seres.
One final note is the tagging vulnerability is not actually addressed without this suggestion from Yuval as well as full ownership proofs bound to actual UTXOs as proposed in his original pull request discussing tagging attacks. All of the data being sent to clients isn’t bound to a specific round ID, so a malicious coordinator is still capable of pulling a similar attack by giving users unique round IDs The following are some of the ways to get in touch with each other:d simply copying the necessary data and re-You can also read about how to get started.signing each unique round ID per-user before sending any messages.
This The current implementation of Wasabi This version 2.0 was created by cutting corners on the part of the other team during implementation.
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