Hi
I need to create a tag - a minimal antenna-to-SE050E design - to do the following.
An app on a mobile device with NFC reader will 1/power the tag; 2/send a string of bytes to sign (about 24 bytes). Then... 3/the signature is read back; 4/the public key verifying the signature is also read back. The algorithm is ECC Ed25519 curve: public key is 32 bytes, and the signature is 64 bytes.
Questions:
1/ Do such tags exist off the shelf to buy - I would imagine it's very basic functionality?
2/ What antenna characteristics I need to use with majority of iphones/androids on the market?
3/ Do you have any middleware to use with NFC readers specifically (I used one written in C for I2C connected SE050E in RPi but not sure if that one would be applicable here).
4/ Do you (or anyone you know of) have examples or SDK for Flutter or JS?
