shamir-mnemonic
SLIP-39 Shamir Mnemonics
Decision gist · record as of 2026-08-14
Yes, if you need a reference SLIP-0039 implementation for testing, verification, or non-sensitive prototyping. The low install friction and zero extra runtime dependencies make it suitable as a library dependency. No, if you need to handle production secrets—the package explicitly warns it is unsuitable for that purpose and lacks hardening against side-channel attacks. Dormant maintenance is acceptable for a stable cryptographic standard but means no active support.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- The package explicitly warns it is not suitable for handling sensitive production secrets due to lack of side-channel attack hardening; use only for testing and verification on non-sensitive data.
- Low friction: pure Python wheel with only dataclasses as a runtime dependency.
- Dormant maintenance status (820 days since last release) means no active development, but the stable SLIP-0039 specification it implements is unlikely to require frequent updates.
License · maintenance · safety
MIT (permissive) — MIT license permits free use, modification, and distribution with minimal restrictions—suitable for both open-source and proprietary projects.
last release 2024-05-16 (820 days)
0 known vulnerabilities (OSV.dev, 2026-08-14) · 168,058 downloads/mo, #10,456 on PyPI
Alternatives
Verify before relying
pip install shamir-mnemonic
from shamir_mnemonic import generate_mnemonics, combine_mnemonics
# Split a secret into 5 shares, requiring 3 to recover
shares = generate_mnemonics(group_threshold=1, groups=[(3, 5)])
recovered_secret = combine_mnemonics(shares[:3])- Whether the implementation has undergone formal security audit or cryptographic review beyond the stated reference implementation purpose.
- Current real-world adoption or compatibility with other SLIP-0039 implementations in production systems.
What it is and what it does
This package is a reference implementation of SLIP-0039, the Shamir's Secret Sharing standard for mnemonic codes. It splits a secret into unique shares distributed among participants, requiring a specified minimum number of shares to reconstruct the original secret—knowledge of fewer shares reveals nothing about the secret. The package provides both a programmatic API and an optional CLI tool for creating and recovering shares.
The implementation is intentionally not hardened against side-channel attacks and explicitly warns against use with sensitive production secrets; its stated purpose is to verify correctness of other implementations. It supports custom multi-group schemes (e.g., requiring completion of multiple threshold groups) and includes test vectors for validation. Runtime dependencies are minimal: only dataclasses on Python 3.6–3.7, and zero extra dependencies on Python 3.7+.
Use it for
- Verify correctness of other SLIP-0039 implementations by comparing against this reference.
- Split a wallet seed or master secret into shares for distributed backup or recovery testing.
- Implement threshold-based secret recovery in applications that need to distribute trust across multiple parties.
- Create custom multi-group backup schemes where different groups must each reach their own threshold.
- Educational exploration of Shamir's Secret Sharing and SLIP-0039 specification mechanics.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you need a reference SLIP-0039 implementation for testing, verification, or non-sensitive prototyping.
The low install friction and zero extra runtime dependencies make it suitable as a library dependency. No, if you need to handle production secrets—the package explicitly warns it is unsuitable for that purpose and lacks hardening against side-channel attacks. Dormant maintenance is acceptable for a stable cryptographic standard but means no active support.
Install
shamir-mnemonic on PyPI
Before you install
Low friction: pure Python wheel with only dataclasses as a runtime dependency. Dormant maintenance status (820 days since last release) means no active development, but the stable SLIP-0039 specification it implements is unlikely to require frequent updates.
The package explicitly warns it is not suitable for handling sensitive production secrets due to lack of side-channel attack hardening; use only for testing and verification on non-sensitive data.
License in practice
MIT license permits free use, modification, and distribution with minimal restrictions—suitable for both open-source and proprietary projects.
Quickstart
pip install shamir-mnemonic
from shamir_mnemonic import generate_mnemonics, combine_mnemonics
# Split a secret into 5 shares, requiring 3 to recover
shares = generate_mnemonics(group_threshold=1, groups=[(3, 5)])
recovered_secret = combine_mnemonics(shares[:3])Verify before relying
- Whether the implementation has undergone formal security audit or cryptographic review beyond the stated reference implementation purpose.
- Current real-world adoption or compatibility with other SLIP-0039 implementations in production systems.
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release <4.0,>=3.6 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 1 packagedataclasses |
| Maintenance | Dormant 820 days since the last release |
| First released | |
| Downloads | 168,058 / month, #10,456 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | License :: OSI Approved :: MIT LicenseProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.6Programming Language :: Python :: 3.7Programming Language :: Python :: 3.8Programming Language :: Python :: 3.9 |
Evidence: shamir_mnemonic-0.3.0-py3-none-any.whl
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See also mnemonic · bip-utils · slip10 · borsh-construct · robocorp-vault · microsoft-security-utilities-secret-masker · SLH-DSA · spake2 · aws-cdk.aws-secretsmanager · bip32