End to end security is an added layer of application security. Zoom can encrypt all presentation content at the application layer using the Advanced Encryption Standard (AES) 128-bit algorithm.This is done at a user level, so once enabled, all meeting would be required to be AES encrypted.
Note: Encryption does impact performance as it requires more processing cycle on the end devices.
How do i enable end-to-end encryption:
Check the box "Enable end-to-end encryption" as seen in the below image -