Regarding BLE security

[Gaurav]

I want to implement BLE security in one of my project where central and peripheral connection should be secured rather than only characteristic protection.

And any way to handle the passkey if devices that have to be connected/bonded are in very high numbers.I dont want to use static passkey.

One more constraint is there that one device doesn't have input output capabilities.Any example or reference to the main structure would be halpful.

[Sigurd]

Hi,

Gaurav said:

And any way to handle the passkey if devices that have to be connected/bonded are in very high numbers.I dont want to use static passkey.

If you want to use non-static passkey, typically the peripheral will need to show the pin-code somehow, e.g. using a display, and then you will need to input the pin-code on the central-side using a keyboard.

Gaurav said:

One more constraint is there that one device doesn't have input output capabilities.Any example or reference to the main structure would be halpful.

If the central device can read NFC tags, you could consider using Out of Band (OOB) NFC Pairing instead of passkey. If you want to read more about BLE security, I recommend reading the information at this page.