Worldcoin joins multi-party security calculations to strengthen iris verification security! Can this be used to eliminate doubts?

The Worldcoin Foundation launched the iris verification process and added the Secure Multiparty Computation (SMPC or MPC) mechanism to verify the uniqueness of the iris in a more secure way. We look forward to further improvements. Reduce the privacy and security concerns of the outside world.

Secure Multi-Party Computation

Secure Multi-Party Computation (SMPC) is a privacy encryption technology that can preserve the privacy of input data while completing the required calculations. For example, two wealthy people do not need to disclose their total assets, but they can compare who has more assets.

To give another specific example, if you now want to calculate the average salary of the team you work for, but everyone does not want to disclose their salary information, then you can ask each team member to use the SMPC function to Salary data is entered in a secure and private manner, and the results are finally calculated.

Complete input in a private manner

The SMPC function calculates the result and the input cannot be reversed

Secure multi-party computation has actually been used in blockchain wallet management for a long time. Multi-signature wallets that manage large amounts of funds can use SMPC to calculate multiple private keys, and if you want to use the assets in the wallet or sign transactions, The holder of the private key does not need to disclose the private key (nor should it be made public), but can complete multi-party verification to perform wallet operations.

Worldcoin announced the launch of the SMPC mechanism

Worldcoin and TACEO cooperated to apply secure multi-party computing technology to users’ iris information to optimize the original iris code verification system, the team said This move will improve the privacy and security level of biometric information.

Original iris verification method

The existing Worldcoin identity verification process is as follows:

• Use Orb to scan the iris of the person who wants to obtain the identity, and perform After image processing.

• Analyze the feature information and extract Iris codes from the information.

• Analyze this Iris codes with other existing encrypted Iris codes, and calculate the Hamming distance to ensure uniqueness.

• Use anti-fraud analysis to ensure that the iris image is not forged.

• After confirming that the verification is successful, the user's World ID is verified with Iris codes, and then the Iris codes are encrypted and uploaded to the cloud.

• Delete the user's iris image in the Orb.

Use SMPC to verify iris uniqueness

This update is to optimize the process of comparing Iris codes by applying SMPC technology to the comparison process , which allows the encrypted Iris codes stored in various databases to have higher privacy.

Worldcoin uses SMPC technology to verify the uniqueness of Iris codes

When a verification device (possibly Orb) issues a verification request, the code will be sent For each participant, the participant will calculate the Hamming distance based on its encrypted partial Iris codes, and finally send the results back to the initiator and combine other results to arrive at the final decision.

The previous uniqueness check system will be disabled and deleted.

Everything is to improve data security

This update of Worldcoin is undoubtedly to improve the security of user iris data. It has also open sourced the Orb software and hardware specifications before. It can be seen that the team is in the technology effort. However, it is still subject to strict scrutiny and criticism from the market and all walks of life, and many countries are still cracking down on Worldcoin due to privacy concerns over this verification mechanism.

Worldcoin still faces great challenges in the future. The author believes that no matter how much advancement and prevention there is in technology, it will not be understood and accepted by the general outside world. After the basic skills of technology are perfected, we still need to think about how to make all walks of life feel truly at ease, which will be an equally important topic.

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