Encrypting FIO Data
/new_funds_request and /record_obt_data require that certain sensitive data in those messages be encrypted using the Diffie-Hellman key exchnage scheme. This ensures that only the sender and receiver of the data can decrypt it.
The data is further serialized to reduce size. Currently there is no abi for that data, but you can find the relevant data elements inside the /new_funds_request and /record_obt_data API method specs.
Encryption inside wallet
Because the encryption of the data requires the private key of the sender and decryption requires the private key of the receiver, it can only be done inside the wallet. This is an important component of the FIO Protocol integration.
For those unfamiliar with Diffie-Hellman encryption, methods in fiojs SDK make this easy.