# facebookarchive/conceal

Conceal provides easy Android APIs for performing fast encryption and authentication of data.

Repository: https://github.com/facebookarchive/conceal
Canonical: https://ross.abutalabs.com/products/conceal
Homepage: http://facebook.github.io/conceal/
Language: C++
License: NOASSERTION
License Family: other
Archived: true
Last push: 2019-01-22T20:01:11+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 4603, "days_push": 2780, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2930, forks 439 (observed 2026-08-28T04:07:30.621875+00:00)

## What it is
Conceal is a Facebook library providing Java APIs for fast, memory-efficient encryption and authentication of data on Android, especially large files on disk. It uses sane cryptographic defaults rather than exposing algorithm choices, and is optimized for older, low-memory Android devices.

## Use cases
- encrypt large files on android devices
- fast encryption on old android phones
- securely store data on disk in an android app
- encrypt files with low memory usage
- add encryption to an android app without choosing crypto algorithms

## When to choose
- you need to encrypt large files on older or low-memory Android devices
- you want simple, opinionated encryption defaults instead of configuring algorithms yourself

## When to avoid
- you need a general-purpose crypto library with algorithm flexibility
- you target modern Android versions where the system crypto stack performs comparably
- you need an actively maintained library - the project is archived with no recent releases

## Facets
- artifact type: library
- maturity: abandoned
- function: cryptography, security, file-system
- domain: security, mobile-development, android-tools
- platform: cpp, jvm
- tags: encryption, android, facebook, file-encryption, native-code, openssl

## Member repositories
- facebookarchive/conceal (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:30.621875+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 2026-08-30T07:33:26.219367+00:00, confidence not recorded.
  - readme: https://github.com/facebookarchive/conceal (fetched 2026-08-28T04:07:30.621875+00:00, sha 24d393617c81)
- Data as of 2026-08-30T08:39:29.467469+00:00.