Typically, homomorphic encryption schemes have a single secret key which is held by the data owner.ДЇor scenarios where multiple different private data owners wish to engage in collaborative computation, homomorphic encryption is probably not a reasonable solution. Instead, meaningful use-cases are in scenarios where strict privacy requirements prohibit unencrypted cloud computation altogether, but the computations themselves are fairly lightweight.

Moreover, data encrypted with homomorphic encryption is many times larger than unencrypted data, so it may not make sense to encrypt, e.g., entire large databases, with this technology. It also comes with a substantial performance overhead, so computations that are already very costly to perform on unencrypted data are likely to be infeasible on encrypted data. Homomorphic encryption is not a generic technology: only some computations on encrypted data are possible. Multiple homomorphic encryption schemes with different capabilities and trade-offs have been invented over the past decade most of these are public-key encryption schemes, although the public-key functionality may not always be needed. The results of such encrypted computations remain encrypted, and can be only decrypted with the secret key (by the data owner). Homomorphic encryption refers to encryption schemes that allow the cloud to compute directly on the encrypted data, without requiring the data to be decrypted first. Therefore, cloud services providing outsourced computation capabilities must have access to the secret keys, and implement access policies to prevent unauthorized employees from getting access to these keys. While traditional symmetric- and public-key encryption can be used for secure storage and communication, any outsourced computation will necessarily require such encryption layers to be removed before computation can take place. Public-key encryption is a fundamental concept that enables secure online communication today, but is typically much less efficient than symmetric-key encryption. Symmetric-key encryption can be used for efficiently encrypting very large amounts of data, and enables secure outsourced cloud storage. Therefore, public-key encryption schemes allow anyone who knows the public key to encrypt data, but only those who know the secret key can decrypt and read the data. Symmetric-key encryption schemes use the same secret key for both encryption and decryption public-key encryption schemes use separately a public key for encryption and a secret key for decryption. Most encryption schemes consist of three functionalities: key generation, encryption, and decryption.

Linking with Microsoft SEAL through CMake.

The APSI library for Asymmetric PSI is available at /Microsoft/APSI. The SEAL-Embedded for CKKS Encryption is available at /Microsoft/SEAL-Embedded. See CKKS Programming with EVA below for more information. The EVA compiler for CKKS is available at /Microsoft/EVA.

New versions will be created when there are important bug fixes or new features.

These branches will stay ahead of the latest version branch/tag. We adopt this approach to merge community contribution and resolve issues in a timely manner. Starting from version 3.7.2, Microsoft SEAL will push new changes to the main, master, and contrib branches without creating a new version. Users of previous versions of the library should look at the list of changes. This document pertains to Microsoft SEAL version 3.7. Microsoft SEAL is written in modern standard C++ and is easy to compile and run in many different environments.ДЇor more information about the Microsoft SEAL project, see. Microsoft SEAL is an easy-to-use open-source ( MIT licensed) homomorphic encryption library developed by the Cryptography and Privacy Research Group at Microsoft.

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