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Concrete v2.9: Enhanced TFHE-rs Interoperability, Python 3.12 Support and Backend Updates

January 14, 2025
  -  
Quentin Bourgerie

The Concrete team is continuing its efforts to make the interoperability between TFHE-rs and Concrete more robust and feature-rich, and this effort can be seen on both the frontend and backend.

We are happy to announce that we have added support for Python 3.12, which can be used both in development and production environments.

You can find all the details, performance improvements, and bug fixes in the full release note.

Enhanced TFHE-rs interoperability

Concrete v2.8 introduced a tooling that enables the import of TFHE-rs ciphertexts into Concrete, allowing computations using the Concrete compiler and runtime, followed by exporting results back to the TFHE-rs ecosystem. However, this initial support was limited to signed integers and offered only partial support for tensors.

With Concrete v2.9, the support for signed integers has been expanded, as demonstrated in the example snippets below. Additionally, the bridge tool now fully supports the serialization and deserialization of tensors, enabling more complex use cases, such as running a linear machine learning model.

import concrete.fhe as fhe
from concrete.fhe import tfhers

# The tfhers signed integer type
tfhers_type = tfhers.int8_2_2(
   tfhers.CryptoParams(
       909,
       1,
       4096,
       15,
       2,
       0,
       2.168404344971009e-19,
       tfhers.EncryptionKeyChoice.BIG,
   )
)

# The concrete function with conversion from tfhers integers to concrete
@fhe.compiler({"x": "encrypted", "y": "encrypted"})
def add(x, y):
   x = tfhers.to_native(x)
   y = tfhers.to_native(y)
   return tfhers.from_native(x + y, tfhers_type)

# Define the inpuset with signed integers
inputset = [
   (tfhers.TFHERSInteger(tfhers_type, -128), tfhers.TFHERSInteger(tfhers_type, 127)),
   (tfhers.TFHERSInteger(tfhers_type, 0), tfhers.TFHERSInteger(tfhers_type, -128))
]
circuit = add.compile(inputset, verbose=True)

# Run the fhe evaluation by encoding/decodinhg arguments/result from/to tfhers signed integer type
print(
   tfhers_type.decode(
       circuit.encrypt_run_decrypt(tfhers_type.encode(1), tfhers_type.encode(-1))
   )
)

Python 3.12 support

Concrete is released on both the public zama pypi and the official pypi.org repository  for Python 3.8 to 3.12 from Linux and Mac OS platform, including CPU and GPU wheels.

Additional improvements

Concrete v2.9 includes various optimizations and bug fixes. Notably, the GPU kernels, now developed under the TFHE-rs GitHub repository, have been updated. In our experiments, these updates resulted in a slight performance improvement for large FHE evaluations.

These improvements require no changes to the API, allowing you to take advantage of the enhancements without extra effort. Give them a try and share your feedback with us! For more details, refer to the full release notes.

Thank you for your continued support and feedback. We remain committed to making FHE more accessible and efficient for everyone.

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Privacy is necessary for an open society in the electronic age. Privacy is not secrecy. A private matter is something one doesn't want the whole world to know, but a secret matter is something one doesn't want anybody to know. Privacy is the power to selectively reveal oneself to the world.If two parties have some sort of dealings, then each has a memory of their interaction. Each party can speak about their own memory of this; how could anyone prevent it? One could pass laws against it, but the freedom of speech, even more than privacy, is fundamental to an open society; we seek not to restrict any speech at all. If many parties speak together in the same forum, each can speak to all the others and aggregate together knowledge about individuals and other parties. 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I cannot here selectively reveal myself; I must always reveal myself.Therefore, privacy in an open society requires anonymous transaction systems. Until now, cash has been the primary such system. An anonymous transaction system is not a secret transaction system. An anonymous system empowers individuals to reveal their identity when desired and only when desired; this is the essence of privacy.Privacy in an open society also requires cryptography. If I say something, I want it heard only by those for whom I intend it. If the content of my speech is available to the world, I have no privacy. To encrypt is to indicate the desire for privacy, and to encrypt with weak cryptography is to indicate not too much desire for privacy. Furthermore, to reveal one's identity with assurance when the default is anonymity requires the cryptographic signature.We cannot expect governments, corporations, or other large, faceless organizations to grant us privacy out of their beneficence. It is to their advantage to speak of us, and we should expect that they will speak. To try to prevent their speech is to fight against the realities of information. Information does not just want to be free, it longs to be free. Information expands to fill the available storage space. Information is Rumor's younger, stronger cousin; Information is fleeter of foot, has more eyes, knows more, and understands less than Rumor.We must defend our own privacy if we expect to have any. We must come together and create systems which allow anonymous transactions to take place. People have been defending their own privacy for centuries with whispers, darkness, envelopes, closed doors, secret handshakes, and couriers. The technologies of the past did not allow for strong privacy, but electronic technologies do.We the Cypherpunks are dedicated to building anonymous systems. We are defending our privacy with cryptography, with anonymous mail forwarding systems, with digital signatures, and with electronic money.Cypherpunks write code. We know that someone has to write software to defend privacy, and since we can't get privacy unless we all do, we're going to write it. We publish our code so that our fellow Cypherpunks may practice and play with it. Our code is free for all to use, worldwide. We don't much care if you don't approve of the software we write. We know that software can't be destroyed and that a widely dispersed system can't be shut down.Cypherpunks deplore regulations on cryptography, for encryption is fundamentally a private act. The act of encryption, in fact, removes information from the public realm. Even laws against cryptography reach only so far as a nation's border and the arm of its violence. Cryptography will ineluctably spread over the whole globe, and with it the anonymous transactions systems that it makes possible.For privacy to be widespread it must be part of a social contract. People must come and together deploy these systems for the common good. Privacy only extends so far as the cooperation of one's fellows in society. We the Cypherpunks seek your questions and your concerns and hope we may engage you so that we do not deceive ourselves. We will not, however, be moved out of our course because some may disagree with our goals.The Cypherpunks are actively engaged in making the networks safer for privacy. Let us proceed together apace.Onward. By Eric Hughes. 9 March 1993.