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Intro

sealed builds on top of PySEAL to provide a Python-native homomorphic encryption library based on Microsoft SEAL v2.3. By Python-native, we mean that it enables using homomorphic operations on CipherText using familiar Python syntax such as +, * and **.

Here is a short example:

from sealed import CipherScheme

cs = CipherScheme()
pk, sk, ek, _ = cs.generate_keys()

secret_1 = 1.0
secret_2 = 2.0

# you can encrypt int, float or numpy arrays
cipher_1 = cs.encrypt(pk, secret_1)
cipher_2 = cs.encrypt(pk, secret_2)

# homomorphic operations with Python-native syntax
cipher_res = 4.4 * cipher_1 + cipher_2 ** 3

res = cipher_res.decrypt(sk)
print("Dec[4.4 * Enc[%s] + Enc[%s] ** 3] = %s" % (secret_1, secret_2, res))
# >> Dec[4.4 * Enc[1.0] + Enc[2.0] ** 3] = 12.4

The code is heavily documented, and tries to be intuitive based on Python operator's expected behavior. For usage samples, see tests dir.

Install

sealed is available for Python version >= 3.5.

Easiest options

sealed support automatic build of dependencies for Linux through a pip command, or through Docker via Dockerfile.

On Linux:

git clone https://github.com/mibarg/sealed
cd sealed
pip3 install . --install-option="--build-seal"

Docker:

git clone https://github.com/mibarg/sealed
cd sealed
docker build -t sealed-container-name -f deploy/Dockerfile .

Other platforms

sealed is built on top of Microsoft SEAL v2.3. Therefore, you need to install in order for sealed to function. Microsoft SEAL v2.3 sources are available in the include dir.

To install sealed on other platforms, follow the following steps:

• Build Microsoft SEAL v2.3 (requires CMake (>= 3.10), GNU G++ (>= 6.0) or Clang++ (>= 5.0) and Xcode toolchain (>= 9.3) in macOS)
• Point environment variable SEAL to the newly built library root
• Install sealed using pip3 install sealed

Acknowledgments

sealed was inspired by and uses large parts of the CPP wrapper for SEAL developed by PySEAL.