ciph
Fast, streaming file encryption for large files. Works on files bigger than your RAM.
Install
pip install ciph
ciph setup
Requirements: Linux/Termux, Python >= 3.8, libsodium
# Debian/Ubuntu
sudo apt install libsodium-dev
# Termux
pkg install libsodium
Or build from source:
git clone https://github.com/ankit-chaubey/ciph
cd ciph && make && pip install .
Usage
ciph encrypt video.mp4 # -> video.mp4.ciph
ciph decrypt video.mp4.ciph # -> video.mp4 (filename restored)
Set cipher or chunk size:
ciph encrypt file.bin --cipher chacha -c 8
Non-interactive (scripting):
CIPH_PASSWORD=yourpassword ciph encrypt file.bin
How it works
- AES-256-GCM or ChaCha20-Poly1305 (auto-fallback if no AES-NI)
- Argon2id key derivation from password
- Data key is randomly generated per file, then wrapped with the password key
- File is encrypted in chunks (default 4 MB) so memory usage is constant
- Each chunk gets a unique derived nonce, authenticated with the full header as AAD
- Original filename stored in header, restored on decrypt
- Chunk size used during encrypt is baked into the header -- you can decrypt with any
-cvalue
File format
| Offset | Size | Field |
|---|---|---|
| 0 | 4 | Magic (CIPH) |
| 4 | 1 | Version |
| 5 | 1 | Cipher (1=AES, 2=ChaCha) |
| 6 | 4 | Chunk size MB (big-endian) |
| 10 | 16 | Argon2id salt |
| 26 | 12 | Nonce-derivation key |
| 38 | 1 | Filename length |
| 39 | N | Original filename |
| 39+N | 2 | Encrypted key length |
| 41+N | L | Encrypted data key |
Followed by repeating [4-byte chunk length][encrypted chunk]. A final zero-length authenticated chunk marks EOF.
The entire header is bound as AAD to every chunk -- tampering with any field breaks decryption.
Limitations
- No resume support
- Password-based only (public-key mode not yet implemented)
License
Apache 2.0 -- see LICENSE
1 maintainer
Metadata
1 maintainer
Release files for ciph 1.2.2
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 | |
|---|---|---|---|---|
| ciph-1.2.2.tar.gz | 14.1 kB | With provenance | Details |
Built distribution (wheel)
| File | Interpreter | ABI | Platform | Reset |
|---|---|---|---|---|
| ciph-1.2.2-py3-none-any.whl | Python 3 | none | any | Details |
Total release size: 24.1 kB
Release files / ciph-1.2.2.tar.gz
| Download URL | ciph-1.2.2.tar.gz |
|---|---|
| Size | 14.1 kB |
| Tags | Source |
|
SHA-256 checksum How to use checksums |
b37ccf72e26bc91ba642e4c434a8ddf1f78a2d025d0e54e3b021e6cfc336719f
|
|
BLAKE2b-256 checksum How to use checksums |
f67a82d134b7bc359dc2fdd8b71b4cf4094fe653ff6353ece73813d296dec8d9
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/6.1.0 CPython/3.13.12
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Jun 9, 2026.
Transparency logRelease files / ciph-1.2.2-py3-none-any.whl
| Download URL | ciph-1.2.2-py3-none-any.whl |
|---|---|
| Size | 9.9 kB |
| Tags | Python 3 |
|
SHA-256 checksum How to use checksums |
ab85650bee1844885e4603396f0d48b5f64658b5d40c9426a54a172ef031b784
|
|
BLAKE2b-256 checksum How to use checksums |
9e8ffe01a73fd574916f03876becca790c04ca52a6482529d2a00a8c20b634e1
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/6.1.0 CPython/3.13.12
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Jun 9, 2026.
Transparency logSecurity for ciph 1.2.2
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
Full provenance
All 2 files in this release have been uploaded with provenance metadata.
Attestation for ciph-1.2.2.tar.gz
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Jun 9, 2026.
Transparency logA note on package security
PyPI is a repository for distributing packages, not a service for auditing them. While third-party security researchers and our staff do their best to detect and remove malicious packages, PyPI cannot guarantee the quality, security or suitability of any given package.
To learn more about protecting yourself from malicious actors, visit our package security documentation.
