Microsoft SEAL

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1. v4.3.0 Apr 25, 2026 · release notes

   SEAL v4.3.0 adds iOS xcframework build script, CMakePresets, and drops NuGetNuGetMicrosoft's package manager for .NET, hosting a public registry of reusable libraries so tools can pull in dependencies without bundling or manually maintaining third-party code. publishing.

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   $ git clone --branch v4.3.0 https://github.com/microsoft/SEAL.git
   # already have the repo? check out this version:
   $ git checkout v4.3.0

   • Adds cmake/ios_xcframework.cmake to build a single-command iOS/macOS libseal-<ver>.xcframework artifact
   • Adds CMakePresets.json for Windows, Linux, and macOS development
   • Drops official NuGet.org publishing; users must now build their own NuGet package from source

   3 details in Everything

   └──▷ BREAKING ON UPGRADE

   • !NuGet.org is no longer updated; existing consumers relying on the latest nuget.org version will not receive updates and must switch to building packages from source
2. v4.1.0 Jan 4, 2023 · release notes

   Microsoft SEAL v4.1.0 adds NTT-based BGY ciphertext storage, raises prime limit to 256, and new Evaluator methods.

   └──▷ GET THIS VERSION

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   $ git clone --branch v4.1.0 https://github.com/microsoft/SEAL.git
   # already have the repo? check out this version:
   $ git checkout v4.1.0

   • Evaluator::mod_reduce_xxx() (native) and Evaluator::ModReduceXxx(...) (dotnet) add new public API for modular reduction operations.
   • Increased SEAL_COEFF_MOD_COUNT_MAX from 64 to 256, allowing larger coefficient moduli in homomorphic encryption schemes.

   2 details in Everything

3. v4.0.0 Mar 17, 2022 · release notes

   Microsoft SEAL v4.0.0 introduces BGV scheme support via seal::scheme_type::bgv and new public methods

   └──▷ GET THIS VERSION

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   $ git clone --branch v4.0.0 https://github.com/microsoft/SEAL.git
   # already have the repo? check out this version:
   $ git checkout v4.0.0

   • Adds BGV scheme [(PR 283)](https://github.com/microsoft/SEAL/pull/283) for homomorphic encryption capabilities
   • Adds the enum value seal::scheme_type::bgv to select the new BGV encryption scheme

   2 details in Everything

   └──▷ BREAKING ON UPGRADE

   • !Removed the friendship of the class EncryptionParameters to the class SEALContext.
4. v3.7.3 Mar 17, 2022 · release notes

   Adds SEAL_AVOID_BRANCHING build option for branchless execution and relocates build artifacts.

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   $ git clone --branch v3.7.3 https://github.com/microsoft/SEAL.git
   # already have the repo? check out this version:
   $ git checkout v3.7.3

   • Adds SEAL_AVOID_BRANCHING CMake option to eliminate branching in critical functions for use with maliciously inserted compiler flags
   • Ensures all output files, including third-party dependencies and Visual Studio projects/solutions, are created in the build directory
   • Updates .NET SDK support to version 6.0.x and adds support for Visual Studio 17 2022

   3 details in Everything

   └──▷ BREAKING ON UPGRADE

   • !dotnet/SEALNet.sln is removed; use the generated dotnet/SEALNet.sln.in or CMake-generated solution instead
5. v3.6.5 May 18, 2021 · release notes

   Microsoft SEAL v3.6.5 updates Intel HEXL to v1.1.0 and improves memory tracking accuracy via shared pool.

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   $ git clone --branch v3.6.5 https://github.com/microsoft/SEAL.git
   # already have the repo? check out this version:
   $ git checkout v3.6.5

   • Updated dependency Intel HEXL to v1.1.0

   1 detail in Everything

6. v3.6.3 Apr 8, 2021 · release notes

   Microsoft SEAL v3.6.3 adds Intel HEXL dependency support and seal::random_bytes API

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   $ git clone --branch v3.6.3 https://github.com/microsoft/SEAL.git
   # already have the repo? check out this version:
   $ git checkout v3.6.3

   • Added support to build Microsoft SEAL with Intel HEXL as an optional dependency
   • Added seal::random_bytes function in randomgen.h

   2 details in Everything

7. v3.6.0 Dec 3, 2020 · release notes

   Microsoft SEAL v3.6.0 adds Zstandard compression support and Shake256 PRNG

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   $ git clone --branch v3.6.0 https://github.com/microsoft/SEAL.git
   # already have the repo? check out this version:
   $ git checkout v3.6.0

   └──▷ USE IT
   Switch to Shake256 for PRNG in SEALNet (C#).
   code copy

   var prng = new Shake256PRNG();
   var factory = new Shake256PRNGFactory(prng);
   var context = Context::Create(SEAL_CIPHERSET, 0, factory.Create());

   Enable Gaussian noise sampling via CMake for NIST PQCPQCCryptography designed to stay secure against a large quantum computer, which could break today's RSA and elliptic-curve keys. NIST standardized the first algorithms in 2024 as ML-KEM, ML-DSA and SLH-DSA. compatibility.
   shell copy

   cmake -DSEAL_USE_GAUSSIAN_NOISE=ON ..

   • Adds Shake256PRNG and Shake256PRNGFactory classes for pseudo-random number generation using the Shake256 (FIPSFIPSA set of US federal standards published by NIST that define approved cryptographic algorithms and modules; cyber tools use it to meet compliance requirements in government and regulated environments.-202) XOF.
   • Adds SEAL_USE_GAUSSIAN_NOISE CMake option to switch encryption error sampling from Centered Binomial Distribution (CBD) to Gaussian distribution.
   • Adds support for Zstandard compression as an alternative to ZLIB, offering 20–30x performance improvement.
   • Adds public API for modular reduction to the Modulus class.

   4 details in Everything

   └──▷ BREAKING ON UPGRADE

   • !seal::SEAL_BYTE is renamed to seal::seal_byte.
   • !Removed BatchEncoder API for encoding and decoding Plaintext objects inplace.
   • !Removed IntegerEncoder and BigUInt classes.
   • !Renamed IntArray to DynArray.
8. v3.5.5 Jul 7, 2020 · release notes

   SEAL v3.5.5 adds seal::util::StrideIter, Barrett precomputation struct, and new macros for memory allocation.

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   $ git clone --branch v3.5.5 https://github.com/microsoft/SEAL.git
   # already have the repo? check out this version:
   $ git checkout v3.5.5

   • Adds seal::util::MultiplyUIntModOperand struct to handle precomputation data for Barrett style modular multiplication
   • Adds overloads for modular arithmetic in native/src/seal/util/uintarithsmallmod.h accepting a MultiplyUIntModOperand instance for improved performance when the same operand is used repeatedly
   • Adds seal::util::StrideIter class in native/src/seal/util/iterator.h
   • Adds SEAL_ALLOCATE_GET_PTR_ITER and SEAL_ALLOCATE_GET_STRIDE_ITER macros in native/src/seal/util/defines.h

   4 details in Everything

   └──▷ BREAKING ON UPGRADE

   • !The function seal::util::barrett_reduce_63 is renamed to seal::util::barrett_reduce_64
9. v3.5.2 May 30, 2020 · release notes

   Adds seal::util::SeqIter, SEAL_ITERATE macro and iterator improvements

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   $ git clone --branch v3.5.2 https://github.com/microsoft/SEAL.git
   # already have the repo? check out this version:
   $ git checkout v3.5.2

   └──▷ USE IT
   Iterate over a sequence of indices using the new SeqIter class
   cpp copy

   for (const auto& idx : seal::util::SeqIter<size_t>(N)) { /* use idx */ }

   Use the new SEAL_ITERATE macro for convenient iteration
   cpp copy

   SEAL_ITERATE(iter, N) { /* use iter */ }

   Create a reverse iterator using the new util functions
   cpp copy

   auto it = seal::util::reverse_iter(10); // Creates a reverse iterator starting from 9 down to 0

   • Adds seal::util::SeqIter<T> iterator for iterating a sequence of numbers for convenient iteration indexing
   • Adds seal::util::iter and seal::util::reverse_iter functions that can create any type of iterator from appropriate parameters
   • Adds macro SEAL_ITERATE that should be used instead of for_each_n

   3 details in Everything

10. v3.5.0 Apr 30, 2020 · release notes

    Microsoft SEAL v3.5.0 adds Android ARM64ARM64The 64-bit instruction set architecture from ARM Holdings, used in modern mobile chips, Apple Silicon, and cloud server CPUs; tools target it to run natively on those platforms without emulation overhead. support, CMake build system, Serializable objects, and larger parameter limits.

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v3.5.0 https://github.com/microsoft/SEAL.git
    # already have the repo? check out this version:
    $ git checkout v3.5.0

    • Adds Serializable class to wrap Ciphertext, RelinKeys, and GaloisKeys for flexible serialization and compression.

    1 detail in Everything

    └──▷ BREAKING ON UPGRADE

    • !SmallModulus class is renamed to Modulus and relocated to [native/src/seal/modulus.h](native/src/seal/modulus.h).
    • !KeyGenerator::[relin|galois]_keys_save and Encryptor::encrypt_[zero_]symmetric_save functions are removed and replaced with overloads of KeyGenerator::[relin|galois]_keys and Encryptor::encrypt_[zero_]symmetric that return Serializable objects.
    • !KeyGenerator::[relin|galois]_keys methods in release 3.4 are renamed to KeyGenerator::[relin|galois]_keys_local.
    • !*coeff_mod_count* methods are renamed to *coeff_modulus_size*, which applies to many classes.
    • !Serialization::SEALHeader layout has been changed; headers are automatically converted for SEAL 3.4 objects, but the format is new in SEAL 3.5.
11. v3.3.0 Jan 15, 2020 · release notes

    Microsoft SEAL v3.3.0 unifies key switching with KSwitchKeys base class and introduces safer SEALContext creation via the HomomorphicEncryption.org security standard.

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    $ git clone --branch v3.3.0 https://github.com/microsoft/SEAL.git
    # already have the repo? check out this version:
    $ git checkout v3.3.0

    • Classes RelinKeys and GaloisKeys are now derived from a common base class KSwitchKeys in native/src/seal/kswitchkeys.h
    • SEALContext::Create() (C++) and constructor (C#) now accepts an optional security level based on the HomomorphicEncryption.org standard, defaulting to 128-bit

    2 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !Method relin_keys(...) in class KeyGenerator no longer accepts argument decomposition_bit_count
    • !Deleted header file native/defaultparameters.h and removed DefaultParams class; default BFV moduli must now be accessed via CoeffModulus::BFVDefault(...)
    • !Removed size_capacity function and data members from Ciphertext class
12. v3.3.2 Jan 15, 2020 · release notes

    SEAL v3.3.2 adds QUIET CMake support and improves CKKS accuracy with RNS rounding

    └──▷ GET THIS VERSION

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    $ git clone --branch v3.3.2 https://github.com/microsoft/SEAL.git
    # already have the repo? check out this version:
    $ git checkout v3.3.2

    └──▷ TRY IT
    Suppress CMake errors when SEAL is missing during configuration.
    copy

    $ find_package(seal QUIET)

    • Adds QUIET option support for CMake find_package(seal) calls

    1 detail in Everything

13. v3.4.0 Jan 15, 2020 · release notes

    Microsoft SEAL v3.4.0 adds ZLIB serialization compression, symmetric encryption via Encryptor with secret key, and memory buffer I/O

    └──▷ GET THIS VERSION

    copy

    $ git clone --branch v3.4.0 https://github.com/microsoft/SEAL.git
    # already have the repo? check out this version:
    $ git checkout v3.4.0

    └──▷ USE IT
    Create an Encryptor instance for symmetric key encryption using a secret key directly
    code copy

    Encryptor encryptor(context, secret_key);

    • Adds Serialization class configured to use ZLIB compression for all serializable objects
    • Enables Encryptor construction with a secret key for symmetric key encryption
    • Adds save_size, encrypt_symmetric_save, and relin_keys_save methods for direct memory buffer serialization

    3 details in Everything

    └──▷ BREAKING ON UPGRADE

    • !Old serialized Microsoft SEAL objects are incompatible with the new format due to rewritten serialization using Serialization::SEALHeader
    • !uint64_count_capacity and uint64_count methods removed from Ciphertext (replaced by int_array)