Is fast 4096 bit asymmetric encryption in the pipeline?

[meetandyhere]

We are using the NRF52840 as a basis for BLE-based secure IoT network. I know that the Crypto library enables hardware-accelerated encryption/decryption. However, as far as I understand, the maximum key length is 512 bits?

I wanted to ask if Nordic as a chip/hardware in the pipeline/already available that can enable fast hardware-accelerated 4096 bit key asymmetric encryption/decryption for a 500 KB payload? Typically we would need the encryption/decryption to finish in under 1 second.

Thanks in advance for any information!

Regards

Andy

[Krzysztof Zaraska]

Errr... you don't encrypt the payload with asymmetric cypher. You encrypt the payload with a symmetric cypher like AES using a random key, and then use asymmetric cypher to encrypt the AES key. Also, 4096-bit key size suggests you are using RSA. Why not switch to ECC? Both faster and smaller key size for the same security.

[meetandyhere]

Yes, we are using RSA. The 4096-bit key requirement comes from our cloud. And true, large payloads do use symmetric encryption. Maybe my 500KB example was a bit exaggerated. It would be a payload that is small enough to pass through asymmetric crypto without prohibitive delays. The use case is the NRF52840 BLE exchanging authentication information (typically JSON string) with a smartphone. Would 4096-bit RSA for small payloads be feasible on the NRF52840?