ble_app_gls donot use LESC

Hi Kai,

MITM protection (SEC_PARAM_MITM) is not possible when SEC_PARAM_IO_CAPABILITIES is set to BLE_GAP_IO_CAPS_NONE. This probably explains the error. Have you tried to disable MITM?

Best regards,

Vidar

Hi Vidar,

I  just disabled MITM and the device can connect.

But when I access characteristic the device automatically disconnects.

Hi Vidar,

I'm doing these combinations for explore the problem of data encryption.

I don't know if the data encryption is because SEC_PARAM_MITM is set or SEC_MITM is set.

Among them, the security level selection just works will also have encryption.

The following shows the results I actually tested through the example code and Sniffer.

Hi Kai,

The link will become encrypted regardless of what pairing method you use. The difference when using LESC is that the sniffer will not be able to pick up the encryption key during the key exchange, so it will not be able to decrypt the communication between your devices.

Sniffing a connection between bonded devices

Hi Vidar,

user4240 said:

The link will become encrypted regardless of what pairing method you use.

Can this passage reveal a little more information?

Hi Kai,

I think you will find the resources below useful. The purpose of the pairing procedure is to securely exchange keys that later are used to encrypt the link, and it's the security of this exchange that differs between the different pairing methods.

https://www.bluetooth.com/blog/bluetooth-pairing-part-1-pairing-feature-exchange/

https://www.bluetooth.com/blog/bluetooth-pairing-part-2-key-generation-methods/

https://www.bluetooth.com/blog/bluetooth-pairing-passkey-entry/

https://www.bluetooth.com/blog/bluetooth-pairing-part-4/

https://www.bluetooth.com/bluetooth-resources/intro-to-bluetooth-security-part1/

https://www.bluetooth.com/bluetooth-resources/intro-to-bluetooth-security-part2/

Hi Vidar,

OK I'll take a look.

Thank you!!

Hi Vidar,

OK I'll take a look.

Thank you!!