# What is the difference between OTAA and ABP Devices

**URL:** <https://www.thethingsnetwork.org/forum/t/what-is-the-difference-between-otaa-and-abp-devices/2723>\
**Category:** End Devices (Nodes)\
**Created:** [July 7, 2016, 7:51am UTC](https://www.thethingsnetwork.org/forum/t/what-is-the-difference-between-otaa-and-abp-devices/2723 "2016-07-07T07:51:25Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![htdvisser](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/htdvisser/32/45312_2.png) [@htdvisser](https://www.thethingsnetwork.org/forum/u/htdvisser)\
**Post date:** [July 8, 2016, 8:52am UTC](https://www.thethingsnetwork.org/forum/t/what-is-the-difference-between-otaa-and-abp-devices/2723/5 "2016-07-08T08:52:26Z")

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Mostly the fact that you hard-code session keys into your device (then they’re not session keys anymore). I’m sure a quick forum search for “Security” will give you some reading material 😉

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