# Is DevAddr encrypted?

**URL:** <https://www.thethingsnetwork.org/forum/t/is-devaddr-encrypted/23238>\
**Category:** Uncategorized\
**Created:** [February 26, 2019, 7:42am UTC](https://www.thethingsnetwork.org/forum/t/is-devaddr-encrypted/23238 "2019-02-26T07:42:46Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![arjanvanb](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/arjanvanb/32/46626_2.png) [@arjanvanb](https://www.thethingsnetwork.org/forum/u/arjanvanb)\
**Post date:** [February 26, 2019, 8:42am UTC](https://www.thethingsnetwork.org/forum/t/is-devaddr-encrypted/23238/2 "2019-02-26T08:42:55Z")

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How would the backend servers know which secret key to use for decryption, when they cannot tell which device the packet belongs to?

As an aside, a DevAddr is not unique: [How does a network know a received packet is for them?](https://www.thethingsnetwork.org/forum/t/how-does-a-network-know-a-received-packet-is-for-them/2735/2)

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