Sindook is a command-line tool that seals files with hybrid post-quantum
encryption using the X-Wing KEM (X25519 + ML-KEM-768) and can rotate
recipients, passphrases, and format versions without decrypting or
re-encrypting the payload in fast mode. Pre-1.0 software: the format and
design have not received an independent security audit.
Publisher’s description
What is sindook?
sindook by Ruddro Roy is open-source Windows software in the encryption category. It is written in Go.
Installation and requirements
The publisher provides Portable installers for 64-bit and ARM64 Windows. It runs without installation (portable).
Project description on GitHub: “Encrypt files with one command: hybrid post-quantum keys, built-in compression, key rotation without re-encrypting. Single binary for Linux, macOS, Windows.”
Pros / Cons
Pros
- Open source: the code can be inspected and built by anyone
- Native ARM64 build for Windows on Arm
- Portable: runs without installation
In short: sindook is an open-source encryption tool for 64-bit and ARM64 PCs.
Is sindook safe to download?
- The file is served by github.com, the publisher’s own domain
- The download link uses HTTPS
- A SHA256 hash is published, so you can verify the file:
77AAF9D016F2DB5F96A16434D7AF79E1DF396920EC3E5BE736AA84ECB4B16895· Open the VirusTotal report for this hash - The link has not been checked yet
- The source code is public
- ExeAtlas does not host, wrap or modify installers
Related guide: How to check a file’s SHA256 hash on Windows
Security practices (OpenSSF Scorecard)
Automated checks of the ruddro-roy/sindook repository on GitHub by the Open Source Security Foundation, last run on October 19, 2026.
- Security policy10
- Dependency update tool10
- No binaries in the repository10
- Actively maintained10
- Restricted token permissions10
- No dangerous workflows10
- Pinned dependencies10
- Licence declared10
- Static code analysis10
- Published packages10
- Tests in CI10
- Fuzzing10
- No known vulnerabilities9
- Signed releases8
- Branch protection3
- Code review0
- OpenSSF Best Practices badge0
- Contributors from several organisations0
The score rates how the project is developed and released, not whether the program is safe to install. scorecard.dev
Recent versions
All 1 versions ›| Version | Date | Size | Files |
|---|---|---|---|
| 0.8.1Latest | August 19, 2026 | — | 64-bit ZIPARM64 ZIP |
Install from the command line
Silent install ›winget install --id ruddro-roy.sindook -eRelated guide: How to use winget: install and update apps
Information
- Publisher
- Ruddro Roy
- Category
- Encryption
- Licence
- Apache-2.0
- Price
- Free
- Source code
- github.com/ruddro-roy/sindook
- Written in
- Go
- Requires
- Windows 11 / 10
- Architecture
- 64-bit, ARM64
- Installer
- Portable
- Version
- 0.8.1
- Released
- August 19, 2026
- Added to the catalogue
- October 6, 2026
- Versions listed
- 1
- Website
- github.com
- winget ID
- ruddro-roy.sindook
Ratings and reviews
No reviews yet. Be the first to rate it.
Alternatives to sindook
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Frequently asked questions
Is sindook free?
Yes. sindook is open-source software under the Apache-2.0 licence.
Is sindook safe to download?
The download comes from github.com, which belongs to the publisher; ExeAtlas does not host or change the file. Compare its SHA256 hash with the one shown here, or open the VirusTotal report for that hash.
How do I install sindook with winget?
Open PowerShell or Windows Terminal and run the winget command shown on this page. winget downloads the official installer and checks its SHA256 hash before running it.
Does sindook run on ARM (Windows on Arm)?
Yes, there is a native ARM64 installer.
Can I use sindook without administrator rights?
Yes, it is portable: unpack and run it.
What are alternatives to sindook?
Cryptomator, GNU Privacy Guard, Keybase, KopiaUI and i2pd. The alternatives page compares them.
