Microsoft SEAL

Simple Encrypted Arithmetic Library or SEAL is a free and open-source cross platform software library developed by Microsoft Research that implements various forms of homomorphic encryption.[1][2]

Microsoft SEAL
Developer(s)Microsoft Research
Initial releaseDecember 3, 2018 (2018-12-03)
Stable release
4.0.0 / March 17, 2022 (2022-03-17)
Repositorygithub.com/Microsoft/SEAL
Written inC++
Operating systemMicrosoft Windows, macOS, Linux, Android
PlatformIA-32, x86-64, ARM64
TypeHomomorphic encryption library
LicenseMIT License
Websitewww.microsoft.com/en-us/research/project/microsoft-seal

History

Development originally came out of the Cryptonets paper,[3] demonstrating that artificial intelligence algorithms could be run on homomorphically encrypted data.[4]

It is open-source (under the MIT License) and written in standard C++ without external dependencies and so it can be compiled cross platform. An official .NET wrapper written in C# is available and makes it easier for .NET applications to interact with SEAL.

Features

Algorithms

Microsoft SEAL supports both asymmetric and symmetric (added in version 3.4) encryption algorithms.

Scheme types

Microsoft SEAL comes with two different homomorphic encryption schemes with very different properties:

  • BFV:[5] The BFV scheme allows modular arithmetic to be performed on encrypted integers. For applications where exact values are necessary, the BFV scheme is the only choice.
  • CKKS:[6] The CKKS scheme allows additions and multiplications on encrypted real or complex numbers, but yields only approximate results. In applications such as summing up encrypted real numbers, evaluating machine learning models on encrypted data, or computing distances of encrypted locations CKKS is going to be by far the best choice.

Compression

Data compression can be achieved by building SEAL with Zlib support. By default, data is compressed using the DEFLATE algorithm which achieves significant memory footprint savings when serializing objects such as encryption parameters, ciphertexts, plaintexts, and all available keys: Public, Secret, Relin (relinearization), and Galois. Compression can always be disabled.

Availability

There are several known ports of SEAL to other languages in active development:

C++

C#/F#
  • NuGet (Microsoft's official package)

Python

JavaScript

TypeScript

References
  1. Microsoft SEAL is an easy-to-use and powerful homomorphic encryption library.: microsoft/SEAL, Microsoft, 2019-11-20, archived from the original on 2019-05-31, retrieved 2019-11-20
  2. Coron, Jean-Sébastien; Nielsen, Jesper Buus (2017-04-10). Advances in Cryptology – EUROCRYPT 2017: 36th Annual International Conference on the Theory and Applications of Cryptographic Techniques, Paris, France, April 30 – May 4, 2017, Proceedings. Springer. p. 104. ISBN 9783319566146.
  3. Downlin, Nathan; Gilad-Bachrach, Ran; Laine, Kim; Lauter, Kirstin; Naehrig, Michael; Wernsing, John (2016-05-25). "CryptoNets: Applying Neural Networks to Encrypted Data with High Throughput and Accuracy" (PDF). Proceedings of the 33rd International Conference on Machine Learning. Archived from the original (PDF) on 2018-08-26.
  4. "The Microsoft Simple Encrypted Arithmetic Library goes open source". Microsoft Research. 2018-12-03. Archived from the original on 2019-11-12. Retrieved 2019-11-20.
  5. Fan, Junfeng; Vercauteren, Frederik (2012). "Somewhat Practical Fully Homomorphic Encryption". {{cite journal}}: Cite journal requires |journal= (help)
  6. Cheon, Jung Hee; Kim, Andrey; Kim, Miran; Song, Yongsoo (2017). "Homomorphic Encryption for Arithmetic of Approximate Numbers". In Takagi, Tsuyoshi; Peyrin, Thomas (eds.). Advances in Cryptology – ASIACRYPT 2017. Lecture Notes in Computer Science. Vol. 10624. Cham: Springer International Publishing. pp. 409–437. doi:10.1007/978-3-319-70694-8_15. ISBN 978-3-319-70694-8. S2CID 3164123.
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