Prove who sent an email & any of it's contents.

Anonymously prove any subset of any email you sent or received. On or Offchain.

From: zkEmail
To: Developers
Subject: prove any content for any email, sent or received
we built a primitive that allows you to prove who sent an email + prove only what content you want from an email while hiding what you don’t want known.
Excited to see what you build : )

The Zk team
Aayush, Sora, Saleel, Wataru, Aditya and Elo
Triangle Envelope
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With ZK Email

You can confidently verify the sender, receiver, subject, or any part of an email while maintaining your privacy. Selectively reveal or hide any part of any email.

To: potus@gov.com

From: email@gov.com

Subject: Whistle Blowing

For example, you can prove you have an email from you@gov.com without disclosing your full address. We can confirm the email has mentions a name, place etc and confirm who we sent/recieved it from potus@gmail.com

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For Developers

Build Your Own

No trusted hardware. No trusted attestation servers.
Only trust zero knowledge proofs, smart contracts, email, and DNS infrastructure.
All MIT open source libraries.

Our Libraries

ZK Email Specific Libraries

ZK Email Libraries

We have several repos within the ZK Email ecosystem. Developers can use these to build their own custom email verification circuits

ZK Email

ZK Regex UI Tools

DKIM Archive

ZK JWTs

Regex Registry

Ether Email Auth

General ZK Libraries

ZK Libraries

While developing ZK Email we built these libraries for general use, that can be applied outside of the ZK Email ecosystem

ZK Regex Library

Halo2 Benchmarking Browser Code

ZK PSI with Grumpkin and Hash to Curve

ZK Strings (base64 + pack)

ZK RSA

ZK Variable Length SHA256

Frequently Asked Questions

Have a Question that isn’t answered?

We can hide any information or selectively reveal any text, wether that’s the sender, receiver, subject, body etc using Regex. Regex is short for regular expression, this term represents sequence of characters that forms a search pattern, commonly used for string matching within text. It consists of a sequence of characters that define a search pattern, enabling complex searches, substitutions, and string manipulations. For example, in programming and text processing, regex can identify, extract, or replace specific text patterns, such as email addresses, dates, or phone numbers, by defining these patterns through a combination of literal characters and special symbols. In the context of ZK Email it is used to parse email headers and extract relevant information.

ZK Email leverages the principles of Zero Knowledge proofs and serverless execution within the browser to provide a verifiable yet anonymous way to confirm an emails contents and recipents . Zero Knowledge proofs allow provers to prove that they know or possess certain information without revealing the information itself to a verifer. In ZK Email, this technology is used to verify user identity and email content without exposing sensitive data to a server or other users. The serverless architecture means that all proof generation is executed entirely within the user`s browser.

The DKIM email signitures do not contain information we can use to sign other emails, all our code is open source and being audited

We use the existing DKIM Signiture, almost all emails are signed by the sending domain server using an algorithm called DKIM. It can be summarized as this rsa_sign(sha256(from:..., to:..., subject:..., <body hash>,...), private key). Every time an email is sent we can verify the sender, receiver, the subject, the body by checking if the corresponding public key of the email address applied on the DKIM signiture returns the sha256(from:..., to:..., subject:..., <body hash>,...) a hash of the from, to subject, email details which we can check by rehashing

Redact Text

Fast Proofs

Open Source

Redact Text

Fast Proofs

Open Source

Upcoming & Past Talks

Meet the team at one of our upcoming talks or message us if you have any questions!