Require a secure aggregation baseline based on homomorphic encryption

[LeoLee1116]

Describe the type of feature and its functionality.

Hello, the efficiency of the Flower framework is amazing and it greatly meets my research needs. Thank you for your contributions! I noticed that secret sharing and symmetric encryption techniques have been considered in terms of secure aggregation. However, as mentioned in #907 , I still haven't found a secure aggregation baseline that explicitly uses homomorphic encryption.

Describe step by step what files and adjustments are you planning to include.

In my opinion, in the simplest case, a secure aggregation strategy based on homomorphic encryption allows all clients to share a pair of keys and encrypt the transmission parameters or gradients. This scheme supports basic operations such as encrypted addition and multiplication during the aggregation process, ensuring the accuracy of server decryption results while providing strong privacy protection. On this basis, the baseline can also be extended to scenarios where each client holds different key pairs, which is of great significance for the development of the Flower framework.

Is there something else you want to add?

No response

[petrosDemetrakopoulos]

I am also extremely interested in such a feature and I am also willing to help towards developing it.

[WilliamLindskog]

Hi @LeoLee1116, @petrosDemetrakopoulos,

This would be a great addition to the framework. Would you be interested in opening a PR? We'd be happy to support you along the way.