> For the complete documentation index, see [llms.txt](https://docs.learncard.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.learncard.com/understand/decentralized-identifiers-dids/key-management-sss.md).

# Key Management (SSS)

How LearnCard protects private keys using Shamir Secret Sharing

## Keys without seed phrases

LearnCard app users don't need to hold or manage a private-key seed.

Shamir Secret Sharing (SSS) splits their key into four shares — device, server, recovery, and email backup — with a **2-of-4 threshold**.

At rest, no single party holds the whole key in this split-key model.

At sign-in, two shares are combined in memory on the user's device to reconstruct the key for signing.

## Why an integrator cares

Users of your app inside LearnCard have a real DID for receiving credentials and signing presentations, without a seed-management user experience.

## Choose your approach

* [`@learncard/sss-key-manager` README](https://github.com/learningeconomy/LearnCard/tree/main/packages/sss-key-manager/README.md) — the library, share storage, and recovery APIs.
* [Seed Phrases](/understand/decentralized-identifiers-dids/seed-phrases.md) — the developer-held-seed alternative for SDK integrations.


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