Encrypting large integers

[bhavinmoriya58]

HI,

I came across the following post on encryption of 64bit numbers

TFHE-rs FHEUint8 vs FHEUint64

Hi! I ran into an issue while working on TFHE-rs and trying to learn how to use your framework. In the first tutorial for high level api I was experimenting with some other parameters, and wanted support for larger numbers. However it seems like the FHEencrypt function does not support larger integers than 16 bit, quite similar to the concrete-python implementation. Here is the sample code I was currently trying to modify: use tfhe::{ConfigBuilder, generate_keys, set_server_key, FheUint8}; …

Is the encryption carried out using packing of each bits of the binary expansion as a coefficient of the polynomial – following the RLWE encryption?

Thanks very much.

[IceTDrinker]

hello @bhavinmoriya58

the bit representation of the integer is split into blocks whiwh are themselves encrypted in LWE ciphertexts, so if you have a set of parameters which supports 2 bits of message, for a 64 bits integer you would get 32 LWEs each one encrypting 2 bits of the 64 bits integer

[bhavinmoriya58]

Thanks very much @IceTDrinker