nRF51 SDK v10.0.0
This information applies to the following SoftDevices: S210, S310
ANT channels can be encrypted. If a master channel is configured to be encrypted, a slave that connects to this master must negotiate the encryption parameters. If negotiation fails, the slave cannot decrypt messages from the master.
If you plan to implement encrypted master channels, see the information about the encryption configuration module. If you want to implement encryption on the slave side in addition, also see the information about the encryption negotiation module.