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Encryption in Bluetooth with low energy uses AES-CCM cryptography. Like BR/EDR, the LE Controller will perform the encryption function.

This function generates 128-bit encrypted Data from a 128-bit key and 128-bit plain text Data using the AES-128-bit block cipher text

PDF: https:\\www.bluetooth.com\~\media\files\specification\bluetooth-low-energy-security.ashx::

Encryption in Bluetooth with low energy uses AES-CCM cryptography. Like BR/EDR, the LE Controller will perform the encryption function. This function generates 128-bit encryptedData from a 128-bit key and 128-bit plaintextData using the AES-128-bit block cypher as defined in FIPS-1971.

Article:

Generic Attribute Profile(GATT) defines the way two BLE devices transfer data back and forth using concepts called Services and Characteristics.

It makes use of a generic data protocol called the Attribute Protocol (ATT), which is used to store Services, Characteristics and other data in a simple lookup table using 16-bit IDs for each entry in the table.

GATT only comes into picture once a dedicated connection is established between two devices

PDF: Introduction to Bluetooth Low Energy - BLE - Cyberlearn - HES-SO[^]

The Generic Attribute Profile (GATT) defines the way a Bluetooth Low Energy device can be accessed using concepts called Services and Characteristics. It makes use of the Attribute Protocol (ATT). Services, Characteristics and related data are represented as a simple lookup table using 16-bit IDs for each entry in the table.

GATT comes into play once a dedicated connection is established between two devices, meaning that you have already gone through the advertising process governed by GAP.