# cyphar/paperback

Paper backup generator suitable for long-term storage.

Repository: https://github.com/cyphar/paperback
Canonical: https://ross.abutalabs.com/products/paperback
Language: Rust
License: GPL-3.0
License Family: copyleft
Topics: paper, backup, shamir-secret-sharing, secret-sharing, encryption, user-friendly
Last push: 2025-10-30T14:11:34+00:00

## Health v2 (maintenance only)
Score: 54/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 49, release rhythm 35, longevity 100
- inputs: {"age_days": 3200, "days_push": 307, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1478, forks 58 (observed 2026-08-28T04:04:50.572998+00:00)

## What it is
paperback is a Rust CLI tool that creates encrypted paper backups suitable for long-term storage. It encrypts data and splits the secret key into Shamir secret-sharing key shards, generating printable PDF documents for each shard.

## Use cases
- create a long-term paper backup of a secret key
- split a secret among multiple people with k-of-n threshold recovery
- set up a digital will recoverable without the creator present
- print and laminate encrypted backup documents
- store a recovery secret without anyone knowing the full key

## When to choose
- you need a backup medium that survives decades without hardware or format dependencies
- you want threshold-based secret sharing among semi-trusted parties
- you want a user-friendly paper backup with generated PDFs

## When to avoid
- you need machine-readable or fast-to-restore backups
- you cannot trust the format stability, since v0 formats may change without warning
- you need frequent automated backups rather than one-time archival

## Facets
- artifact type: cli-tool
- maturity: experimental
- function: cryptography, backup, pdf, security
- domain: security, privacy, developer-tools, files
- platform: windows, cli, cross-platform
- tags: shamir-secret-sharing, paper-backup, encryption, digital-will, key-shards, rust, linux, macos

## Member repositories
- cyphar/paperback (main) score 54

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:50.572998+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:34:21.220299+00:00, confidence not recorded.
  - readme: https://github.com/cyphar/paperback (fetched 2026-08-28T04:04:50.572998+00:00, sha dd5ee4896f63)
- Data as of 2026-08-30T08:39:29.467469+00:00.