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+# crype
+
+![](https://img.shields.io/badge/written%20in-C%2B%2B%2C%20C-blue)
+
+Deterministic syncable/diffable encryption, for files or pipes.
+
+`crype` is a tool providing rsyncable deterministic-encryption (like rsyncrypto for pipes). It encrypts data using a common decision function over plaintext, allowing rsync-like tools to still work efficiently over the encrypted data. It uses HMAC-SHA1-PBKDF2 and the ChaCha stream cipher.
+
+Compression is also implemented, as this improves both portabiity and rsyncability compared to a separate `gzip --rsyncable` pass.
+
+See `crype --help` for usage instructions. Binaries are provided for 32-bit Windows, 32-bit Cygwin, and 64-bit Debian 7. 
+
+## License
+
+Source code is made available freely under the terms of the ISC license. The source code distribution includes library code under {public-domain, BSD, Unlicense} licenses.
+
+The provided binaries are likewise freely redistributable for any purpose.
+
+## TODO
+
+- Reduce peak memory usage by using stream functions for decompression
+- Parallel compression/encryption
+- Distro packages, static binaries
+
+## Changelog
+
+2014-05-24: r59
+- Add file header for version compatibility detection
+- Add plaintext comment to file header
+- Allow configuring compression level
+- Support Debian 7 (amd64)
+- Support Cygwin (i386)
+- Security: Improve security by switching chunk IVs based on truncated plaintext HMAC (incompatible change)
+- Security: Read encryption passwords from file
+- Security: Warn when reading encryption password from argument
+- [⬇️ crype-r59.zip](dist-archive/crype-r59.zip) *(205.77 KiB)*
+
+
+2014-05-14: r30
+- Initial release
+- [⬇️ crype-r30.zip](dist-archive/crype-r30.zip) *(133.55 KiB)*
+
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