# Post-Quantum Cryptography

The post-quantum cryptography described here centers on `saorsa-pqc`, transport documentation built around ML-KEM-768 and ML-DSA-65, and `ant-keygen` release-signing with ML-DSA-65.

## Why it matters

If you are reasoning about security, transport identity, or release authenticity, you need to know which cryptographic primitives the stack uses.

## How it works

### saorsa-pqc

`saorsa-pqc` is a broader PQC library that includes:

* ML-KEM key encapsulation variants
* ML-DSA signature variants
* SLH-DSA signature variants
* BLAKE3, SHA3, HMAC, HKDF, AES-256-GCM, and ChaCha20-Poly1305

So the library itself is broader than any single Autonomi-facing transport choice.

### saorsa-transport

`saorsa-transport` describes its transport layer as pure post-quantum and highlights this pair for transport use:

* ML-KEM-768 for key exchange
* ML-DSA-65 for signatures

The transport layer has no classical fallback.

### ant-keygen

`ant-keygen` is the release-signing CLI that uses ML-DSA-65. It generates release-signing keypairs, signs files, verifies signatures, and supports a signing context for domain separation.

### Key separation and signing contexts

`saorsa-pqc` provides HKDF-SHA3-256 and HKDF-SHA3-512 as key-derivation primitives.

That means the crypto library can derive new key material from shared secrets or existing key material. `ant-keygen` also supports a signing context so one signing domain stays separate from another. The default context is `ant-node-release-v1`.

## Practical example

```bash
ant-keygen generate ./keys

ant-keygen sign \
  --key ./keys/release-signing-key.secret \
  --input ./artifact.tar.gz \
  --output ./artifact.sig

ant-keygen verify \
  --key ./keys/release-signing-key.pub \
  --input ./artifact.tar.gz \
  --signature ./artifact.sig
```

## Upstream sources

* [saorsa-pqc](https://github.com/saorsa-labs/saorsa-pqc)
* [saorsa-transport](https://github.com/saorsa-labs/saorsa-transport)
* [ant-keygen](https://github.com/WithAutonomi/ant-keygen)

## Related pages

* [Self-Encryption](/developers/core-concepts/self-encryption.md)
* [Core Concepts Overview](/developers/core-concepts/overview.md)


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