Hyperledger Foundation Hyperledger Global Forum 2021, 11 Jun 2021

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From YouTube: Enhanced-privacy DID and Efficient Zero-knowledge Proof Comparison and..-Gyeongjin Ra, & Taehoon Kim

Description

Enhanced-privacy DID and Efficient Zero-knowledge Proof Comparison and Implementation in Hyperledger (CL-Signature and ZK-SNARKs) - Gyeongjin Ra, & Taehoon Kim, Soonchunhyang University

The capacity for users to monitor the custody of their own identifiers and credentials and novel data ownership and governance identity management(IDM) models with built-in control and consent mechanisms can be supported by blockchain technology. In particular, proof of zero-knowledge proof (ZKP) allows for efficient data verification and selective disclosure without exposing it. ZK SNAKRs was applied to cryptocurrency Z-Cash, CL-Signature has been applied to the Hyperledger Fabric INDY project and various DIDs. Our contribution is we modify and implement the ZK-SNAKRs scheme used in Z-Cash for the Hypberledger Fabric. Then, We design and develop the Enhanced-Privacy IDM Framework using the pre-mentioned ZKP. We have implemented and validated ZK-SNAKRs being more efficient in proof verification than CL-Signature in the same environment called Hyperledger.

Session Details & Slides (if available)- https://sched.co/j3dT
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Hyperledger – Open Source Blockchain Technologies

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Good evening, everyone our topic is in hence prior bus did in high quality, efficient general knowledge, comparison and implementation focus on serious signature and jessica stars.

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We are a researcher in the information secretary of professor emery at sunshine university from south korea.

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I'm a phd student. Are we honest first type, one two three part tim kim is a phd student also he is going to present second half four five, six part: okay.

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First, we are talking about introduction on the internet, centers and disperse communicated, communicate security through user and message, authentication, authentication, server issues, tokens to arbitrate users to access date, but traditional muscles were centralized. It has a single point of parallel since then distributed and pediatric muscles have issued. However, users don't want their island information spread at internet.

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In addition, it is epic for users to control or verify their information. So this generalized lectures such as blockchain, provides public validate date, data and credibility via temper registers.

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So, let's think about it, for example, user analyst wants to use the service, so the service provider requests at least two qualification, but we are curious. One is if this is just others of authentication.

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Ori alice need to order the age 18.. So this situation ali should submit sensitive information such as social security number or actual addresses, where someone collects usual information through public networks and blockchain lectures.

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So we need to consider two things. One is the set range of information labeling through cryptography method. At the same time, it prevents that participants profile from address information, so the other is the information provider issues at least credential for on connect analyst identity capability.

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So in other words, the information is stored outside blockchain and is recorded only peer-to-peer, secure connection values.

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On the left side, uh the x.509 system use the same and repetitory public key signature, so usual tracking is possible on the right side side. The identity mixer of the high pressure in the project on connects user identity key by issuing different transaction certificates for each parish of the usual relying party.

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However, it preachers attorney bt through a single credential package, so each gtid is associated with a method and a did message specifies the rules for how the ide is registered, verified, updated and neighbor. Kids on that network.

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As you know, attribute-based credentials, that is, are a form of authentication mechanism that allows to flexibly and authenticated different attributes about an entity without leaving additional information about the entity.

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General knowledge proof allows to create logical operation in the form of true or false proof. The user creates proofs by mixing secret and public values known ori 1, so the validator verifies that it matches the recipe message without secret secret to israel peace. So we take a look at that case. Snacks also known as cell signature and jet cache, which are popular in indie, and I did project.

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Actually, the symbol of jail night proof in the blockchain is not just security.

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The message of the blockchain must come from three things. First, does the date exist on the blockchain? Second, is the owner of the date correct? That is? Do you have a private key? Finally, is the data not duplicated in this case journalist provides a simple verification system by keeping the credential value secret. Therefore, it had scalability, so blockchain and general knives. Proofs are a very good combination.

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Existing transaction requests are converted to proof the size is reduced and the verification time is legacy 2.. So our contribution is as follows. First, we propose a did system with enhanced product privacy like high pressure in the project, is suppressed and suppressed the members identification and the secure connection of the transactions certificate.

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Second, we implementation representative, general knowledge, proofs, certification and just case numbers, because the traditional in the project considers original signature, so our jet cache application is a new challenge. Finally, we comparative nris performed in various simulations to change this in the number of users and validator.

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So the id that communicates with the following three object: you look see a wrapped picture. Users are the original owners of a attribute information.

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We we can call this object. Our hoarder issue is a credential issues that guarantees user information or credential to an institution or company rights. Validators are reliant party usury service provider.

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In this case the issuer provides the secure connection value that the actual information called the credential user stores their credentials and submit them in multiple bundles. In this case, selective information, exposure and generalized proof are used.

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Therefore, did is unique. Identification address, pointing to a credential, for example, alice corresponding tid 123. Current abc document contains actual information.

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You you can see that alice id abc name analyst, public key juju, one um time and signature and so on. It is not uploaded to the blockchain and is stored in the form of jeremiah's poop. The disabled part verifies the credential and they submit it by a blockchain.

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So if the proper has to repeatedly respond to at least the challenge without labeling, his general knowledge.

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And jet cleaning snacks generates a challenging polynomial through a preset string so that bob the validator, can communicate and verify only one loan.

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Except for the secret value of the proverb, the rest are probably values: change the following: polynomial to perform gate operation to an arithmetic circuit.

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The first step is a parameter setup based on electric current cryptography. This computation gives the proper and verifier the same function, but this value is destroyed after setting and then transform. It transforms the polynomial into a function form.

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Then it is broken down into a single calculation that is black, cold and arithmetic circuit uh steps, and then it is to adjust the form of xiaomi secret calculation so that it is divided by zero. Finally, the validator efficiency validates whether it is device silver by zero, in other words.

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Otherwise, your signature binds and tribute to a single validation message through pairing, the isomer precomputations, the issuer issues, the usual credentials by digital signature, multiple clients with their private key, so next step is uh 10 kim will make the next month. Thank.

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Hello, my name is tung kim. I start the presentation. First, I will describe objects the usual in an information provider. At the same time, this is the subject of requesting the issuance of credentials.

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All participants are all term developers to all objects participating in this project. Lutoca is the time level object, and this manages icae.

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Ica is divided into registers and issuers, and each role is registered and issued. Verifier is the service provider, and this verifies the user's credentials and profiles provides services.

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The overseas team flow is shown in the following figure: it is objects include user registration, server using server and service provider. The flowchart steps consist of a total of three steps. The first step is registration and token issuance usual registers themselves and requests or talk to issue an anonymous certificate.

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The second step is to issue an anonymous certificate.

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The user sends the talking to the issuing server after that, the issuing server verifies the token and then, if it is a valid token, it issues an anonymous certificate to the user.

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The final step is the credential verification step. The user sends an anonymous certificate to the verifier and then the verifier verifies the values required for generalized proof. If who is a legitimate estimated user service providers, pro provides services.

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This is page implementation class diagram, as shown in the figure below. There are a lot to say I say usual tf and pay fire usually runs this project using tf, not to say registers, id and password of all participants, ica issues, participants, key pairs, tokens and anonymous certificates.

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Chain code opens two messages: check case snacks and share signature.

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So following is the configuration of the development system environment for this project root, ca, ic and tf were implemented using google cloud hypothetical favorite samples used further 1.4 hypothetical favorite samples were used because they are each to develop and we developed it it by modifying fields, orders and channels other than that the specifications are as follows.

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Next, this page is description of the function. This project consists of 12 steps, a provides function from user registration to anonymous certificate, verification function.

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Here is the implementation result, this project implemented rdf in the form of a website.

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First, this is step of the logo in screen using the wallet second, when our user logs in the anonymous certificate issued by the user is as follows, and the user who receives is towards its intel world.

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It includes various transactions such as transaction id channel id token value and proper hedge value.

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Next verifier needs to trace the transaction to verify the anonymous side package, verify your use, token values to track transactions.

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The following is an anonymous certificate using shared signature. The contents are as follows: the transaction id channel id and timestamp are the same. It consists of x y and chat values they can be disclosed.

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Also anonymous certificates using shared signature are attracted using the q value.

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Next, I will explain the efficiency analysis. This project uses check, case snacks and share signature for jkp.

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In addition, the verifier is fixed to one first and talk. Comparison is made when the number of users gradually increases.

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The following was compared when the number of peripherals and users gradually increases when the number of users increases by 1 and the number of users increase by 1., the average delay time or share signature is short and throughput is high. Still 6k. Snacks are more efficient when the number of users increases.

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When there are many users signature each channel generally slightly faster than jk snacks.

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However, as the number or numbers of verifiers and users increase check, cash snacks are first third and share signature when the numbers of users and verifiers increase by one the generation time or chat case next and share signature are shown.

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In addition, the maximum delay time minimum average delay time and throttle results are also shown in figures, as shown in figures. If the number of users increase the average latency objective snacks and share signature to squeeze and source put increases.

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Similarly, latency and source port are the same as check case snacks, with the first user extension to blockchain network throws the application resulting in relatively highly touch and low source pool.

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However, it can be seen that the number of verifiers increases average delay time and stress, put decrease also when the number of users is small, the original time or which exchange is short and the source put is high and the number of users increases. It can be seen that charitable snacks are more efficient.

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Compressing in comparison and analysis of certificate, snacks and share signature compounds that that the ability, time to excrete and source, put increases as the number of usual increases.

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Also, it was confirmed that evolution delay time increased end source put decreases as the number over verified increases, by contrast, according to differential research, analysis of jk snacks and share signature when the number of usual increases and the verifier is fixed to 1, the evolutionary time of signature is short and source point is high.

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Also when the number of users increases y1 and the number of users increases by one the average time over exchange is short and slow. Speed is high check. Snacks is more efficient when the number of users increases when there are many users share. Signature is generally slightly better than jk snacks.

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However, as the numbers or verifier end, you just increase, jk stocks is faster than say, signature.

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If four, then four verifies exist, some fields will be down. In other words, if more than four fields are operating, the hyperledger failing network, it cannot be processed.

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Will be done in the future of protocol with city, specific security will be developed by applying it to a concrete environment. Continuous research to improve the speed of hkp and blockchain performance is required.

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This is, I have fulfilled for you today. Thank you for your time. Thank.

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If you have any questions, please contact us by email.

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We will write your write. My we are our email address in the chat box. If you haven't question, let me know any email.