About the BINFHE KeyGen and Decrypt

For FHEW/TFHE, OpenFHE supports both secret-key and public-key encryption. An example of public key encryption is provided in openfhe-development/src/binfhe/examples/pke/boolean-pke.cpp at v1.2.4 · openfheorg/openfhe-development · GitHub (the comments in this example provide further details on how to avoid automated modulus & key switching, i.e., how to keep the large dimension).