Distributed Secret Sharing
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README.md

Polykey

Polykey is a distributed secret sharing system. It helps you manage your secrets, passwords, API keys and more. It is designed for both managing personal secrets and infrastructural secrets. This means it can be used interactively, or in automated fashion. Unlike hosted password managers, it is "self-hosted", you keep your own secrets. However it is not an "online" service, so it needs very little maintenance.

It is distributed and decentralised, and secrets are shared between Polykey nodes. As a user, you can create multiple nodes for each of your computing platforms, and backups are simply another Polykey node.

Polykey integrates Git, GnuPG, and Keybase.

It is written in JavaScript and intended to work cross-platform: Linux, Mac, Windows, Android, iOS. It does not necessarily run in the browser.

The design of Polykey is still under flux. Below is currently the proposal.

A Polykey node is just an encrypted tar archive. It is just state, not code. One can launch a Polykey application targetting a specific node. This node needs to be accessible, it can just be a local file path.

The encrypted tar archive represents a sort of virtual directory of secrets. It is an indexed tar archive to allow random access.

Secrets are organised in flat repositories instead of a hierarchy. In order to organise secrets, secrets are grouped into tags. This means it is a sort of tag based filesystem. This is achieved through the use of hardlinks.

A Polykey node is never decrypted on-disk, it always remains encrypted on disk. It is only decrypted in-memory. This means we unpack the archive into an in-memory filesystem. This enables us to maintain portability between different platform behaviours with regards to filesystem features such as support for hardlinks.

An important feature of Polykey is the ability to share secrets in a distributed peer-to-peer style. Our foundation is to start with a Git based synchronisation system. Secrets are managed as git directories, which maintains version history of secrets as they are updated. It is possible to then push to nodes that you control. But for nodes that you don't control, you can allow other nodes to pull your secret repositories

Sharing secrets is done through public & private key cryptography. In order to share keys with another node, you need to know their public key. For initial key discovery we rely on on keybase for social proof and as an alternative to public key servers.

Each secret repository has its own version history. This means a secret repository may contain multiple secrets. Each secret repository is shared as a unit. It is probably recommended to keep a secret repository for each secret.

Why would you share secrets? Beyond the basic issue of having a shared API keys among several agents, or a shared password between users. This also allows a basic form of capability based security. Where you can create hierarchal networks of Polykey nodes, and subdivide secrets into smaller Polykey nodes.

The result is that secrets are encrypted at rest, secrets are encrypted at transmission, and they can be shared between users and infrastructure. There's no need for a network unless you are sharing secrets. And you can run a Polykey node out of a USB stick.

All of other bells and whistles of modern password managers can then be built on top of this secure platform.


Current status:

The last 2 are still being developed.