Skip to content


Switch branches/tags

Name already in use

A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?

Latest commit



Failed to load latest commit information.
Latest commit message
Commit time

Cryptographic primitives, hosted on the decentralized nodes of the Threshold network, offering accessible, intuitive, and extensible runtimes and interfaces for secrets management and dynamic access control.

pypi pyversions codecov discord license

TACo Access Control

TACo (Threshold Access Control) is end-to-end encrypted data sharing and communication, without the requirement of trusting a centralized authority, who might unilaterally deny service or even decrypt private user data. It is the only access control layer available to Web3 developers that can offer a decentralized service, through a live, well-collateralized and battle-tested network. See more here:

Getting Involved

NuCypher is a community-driven project and we're very open to outside contributions.

All our development discussions happen in our Discord server, where we're happy to answer technical questions, discuss feature requests, and accept bug reports.

If you're interested in contributing code, please check out our Contribution Guide and browse our Open Issues for potential areas to contribute.


If you identify vulnerabilities with any nucypher code, please email with relevant information to your findings. We will work with researchers to coordinate vulnerability disclosure between our stakers, partners, and users to ensure successful mitigation of vulnerabilities.

Throughout the reporting process, we expect researchers to honor an embargo period that may vary depending on the severity of the disclosure. This ensures that we have the opportunity to fix any issues, identify further issues (if any), and inform our users.

Sometimes vulnerabilities are of a more sensitive nature and require extra precautions. We are happy to work together to use a more secure medium, such as Signal. Email and we will coordinate a communication channel that we're both comfortable with.

A great place to begin your research is by working on our testnet. Please see our documentation to get started. We ask that you please respect testnet machines and their owners. If you find a vulnerability that you suspect has given you access to a machine against the owner's permission, stop what you're doing and immediately email