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Top 23 C++ Encryption Projects
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HElib
HElib is an open-source software library that implements homomorphic encryption. It supports the BGV scheme with bootstrapping and the Approximate Number CKKS scheme. HElib also includes optimizations for efficient homomorphic evaluation, focusing on effective use of ciphertext packing techniques and on the Gentry-Halevi-Smart optimizations.
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Project mention: CryFS: A Cryptographic Filesystem for the Cloud | news.ycombinator.com | 2024-11-29
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react-native-mmkv-storage
An ultra fast (0.0002s read/write), small & encrypted mobile key-value storage framework for React Native written in C++ using JSI
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Project mention: Show HN: Ncrypt – Query encrypted files privately with FHE | news.ycombinator.com | 2025-07-04
Hey HN,
We're building ncrypt, an open-source encrypted file manager that allows you to store, manage, and privately query your files using fully homomorphic encryption (FHE). This project originally started as a simple SFTP-like CLI for my personal S3 buckets which I used to send and retrieve encrypted files and have more granular control over key rotation.
As the number of files that I was storing grew, file discovery started to become a problem, and I found myself frequently having to download and decrypt files to inspect their contents. Rather than leaving them unencrypted in S3 and therefore easier to search, I started looking into the concept of searching over encrypted data using fully homomorphic encryption. This led me to Zama's concrete-python library (https://github.com/zama-ai/concrete), which provides a simple Python interface for performing FHE operations.
FHE is notoriously slow, so rather than trying to search over entire files I focused on a more tractable problem, indexing and searching over file metadata (summaries, keywords, embeddings, etc) which was small enough to make search practical. While still not fast compared to traditional file management tools, ncrypts search performance is decent if you keep directory sizes relatively small (under 25 files), and most of the heavy lifting happens during metadata extraction, not at search time.
The two types of encrypted queries we currently support are keyword search and cosine similarity search over vector embeddings, which are generated using user-specified huggingface models. Ncrypt currently supports metadata extraction for text, image, and audio files. Check out our code and give it a try at https://github.com/ncryptai/ncrypt.
We love feedback!
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steganography
Simple C++ Image Steganography tool to encrypt and hide files inside images using Least-Significant-Bit encoding.
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People have thought about how to do forward secrecy with PGP:
https://sequoia-pgp.org/talks/2018-08-moving-forward/moving-...
https://sequoia-pgp.gitlab.io/openpgp-dr/openpgp_dr/index.ht...
https://github.com/stealth/opmsg
https://github.com/autocrypt/autocrypt/issues/444
There's a lot going on in the space. It is more innovative than you're giving it credit for, especially around double ratchet. Not there yet, but there's a good reason why I don't mind: control. Multi client support (DeltaChat desktop, hallelujah) and the fact that email remains federation-first.
My identity definitely leaks to my server because I pay it's bill. Not only that, but most of my contacts run their own email or borrow it from me or someone else. Our data does not leave any EU countries apart from the UK. We have IM that doesn't involve any Americans.
Some might imagine we feel terribly smug about that right now :)
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EncryptPad
Minimalist secure text editor and binary encryptor that implements RFC 4880 Open PGP format: symmetrically encrypted, compressed and integrity protected. The editor can protect files with passwords, key files or both.
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peekaboo
Simple undetectable shellcode and code injector launcher example. Inspired by RTO malware development course.
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DISCoHAsH
:rocket: DISCoHAsH - Simple, fast, quality hash in 120 lines. 10GB/s serial (depending on hardware). Also in NodeJS
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crash
crypted admin shell: SSH-like strong crypto remote admin shell for Linux, BSD, Android, Solaris and OSX (by stealth)
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Project mention: Hackers now use ZIP file concatenation to evade detection | news.ycombinator.com | 2024-11-15
DAR (Disk ARchiver)[1] looks to be a good alternative. It supports random access, encryption, and individual file compression within the archive.
[1] http://dar.linux.free.fr/
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ZeeArchiver-Android
Zee is an efficient and simple to use Android Archiver and decompressor. It can decompress and compress from-to all the formats supported by the well known 7zip utility. Copyright © 2018 Mahmoud Galal , for support contact me:[email protected]
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
C++ Encryption discussion
C++ Encryption related posts
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Briar: Peer to Peer Encrypted Messaging
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On Intel SGX, is it possible to set an executable running such that you, the operator, cannot decrypt its state?
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My Mother Found Out I was Installing Linux...
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Help with USB drive encryption
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Ask HN: What are the U.S. requirements for releasing OSS that uses encryption?
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I used to work for apple
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How do you get ownership over all the folders and files on a usb disk
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A note from our sponsor - Sevalla
sevalla.com | 1 Sep 2025
Index
What are some of the best open-source Encryption projects in C++? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | SEAL | 3,855 |
| 2 | fully-homomorphic-encryption | 3,602 |
| 3 | HElib | 3,212 |
| 4 | cryfs | 2,134 |
| 5 | apfs-fuse | 1,977 |
| 6 | react-native-mmkv-storage | 1,709 |
| 7 | concrete | 1,426 |
| 8 | xorstr | 1,343 |
| 9 | steganography | 1,047 |
| 10 | securefs | 791 |
| 11 | opmsg | 753 |
| 12 | EncryptPad | 451 |
| 13 | peekaboo | 254 |
| 14 | DISCoHAsH | 218 |
| 15 | plusaes | 218 |
| 16 | CIDLib | 213 |
| 17 | crash | 198 |
| 18 | DAR | 159 |
| 19 | psc | 124 |
| 20 | conceal-core | 100 |
| 21 | ZeeArchiver-Android | 88 |
| 22 | stenc | 77 |
| 23 | librengine | 71 |
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