PyKyber
Post-quantum key encapsulation for Python: ML-KEM (FIPS 203), written in Rust with no third-party crypto crate and no Python dependencies. Licensed MIT OR Apache-2.0.
Install
pip install pykyber
Python 3.8 or newer. Prebuilt wheels cover Linux (glibc and musl), macOS and Windows.
Quick start
import pykyber
alice = pykyber.ML_KEM_768() # Alice makes a keypair
bob = pykyber.ML_KEM_768.encapsulate(alice.public_key) # Bob encapsulates against her public key
secret = alice.decapsulate(bob.ciphertext) # Alice recovers the same 32-byte secret
assert secret == bob.shared_secret
ML_KEM_512, ML_KEM_768 (NIST's default) and ML_KEM_1024 work the same way.
Sizes
| Class | Public key | Secret key | Ciphertext | Shared secret |
|---|---|---|---|---|
ML_KEM_512 |
800 bytes | 1632 bytes | 768 bytes | 32 bytes |
ML_KEM_768 |
1184 bytes | 2400 bytes | 1088 bytes | 32 bytes |
ML_KEM_1024 |
1568 bytes | 3168 bytes | 1568 bytes | 32 bytes |
Performance
Time per call from Python on an Intel Core i7-7700 (Python 3.14, release build, median of 7 rounds of 500 calls). One machine, one run.
| Class | Key generation | Encapsulation | Decapsulation |
|---|---|---|---|
ML_KEM_512 |
0.031 ms | 0.037 ms | 0.045 ms |
ML_KEM_768 |
0.052 ms | 0.058 ms | 0.071 ms |
ML_KEM_1024 |
0.082 ms | 0.089 ms | 0.106 ms |
More
Everything else is in docs/: the API reference, the guide for teams adopting PyKyber (licensing, supply chain, security status, upgrade policy), and SECURITY.md for reporting vulnerabilities.
Deprecated: Kyber
Kyber512, Kyber768 and Kyber1024 (round-3 CRYSTALS-Kyber) still work and give the same output as 1.0.5, but they are deprecated and emit a KyberDeprecationWarning. They are not interoperable with ML-KEM. See the migration guide.
1 maintainer
Metadata
1 maintainer
Release files for pykyber 2.0.0
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | Provenance | Actions |
|---|---|---|---|---|
| pykyber-2.0.0.tar.gz | 362.5 kB | Without provenance | Details for pykyber-2.0.0.tar.gz |
Built distributions (wheels)
Total release size: 7.1 MB
Release files / pykyber-2.0.0.tar.gz
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Release files / pykyber-2.0.0-pp311-pypy311_pp80-manylinux_2_34_x86_64.whl
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Release files / pykyber-2.0.0-cp38-abi3-win_arm64.whl
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Release files / pykyber-2.0.0-cp38-abi3-musllinux_1_2_x86_64.whl
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Release files / pykyber-2.0.0-cp38-abi3-musllinux_1_2_armv7l.whl
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Release files / pykyber-2.0.0-cp38-abi3-manylinux2014_x86_64.manylinux_2_17_x86_64.whl
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Release files / pykyber-2.0.0-cp38-abi3-manylinux2014_aarch64.manylinux_2_17_aarch64.whl
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