# \#encryption

**URL:** https://discuss.blues.com/tag/encryption/4.md

[Latest](https://discuss.blues.com/latest.md) · [Categories](https://discuss.blues.com/categories.md) · [Tags](https://discuss.blues.com/tags.md)

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## [Getting API Key](https://discuss.blues.com/t/getting-api-key/3536)

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**Author:** [@carlosG](https://discuss.blues.com/u/carlosG)\
**Replies:** 8\
**Last updated:** [May 5, 2026, 2:52pm UTC](https://discuss.blues.com/t/getting-api-key/3536 "2026-05-05T14:52:25Z")

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In this example (GitHub - tjvantoll/notecard-ack-example: An example web application showing how to do acknowledgments for Notecard- and Notehub-based projects · GitHub) a Notehub API Key is required. I tried to use this…

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## [Send Binary Data](https://discuss.blues.com/t/send-binary-data/3303)

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**Author:** [@alevillegas.cat](https://discuss.blues.com/u/alevillegas.cat)\
**Replies:** 3\
**Last updated:** [October 11, 2025, 10:52am UTC](https://discuss.blues.com/t/send-binary-data/3303 "2025-10-11T10:52:00Z")

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I am trying to send binary data following the documentation, using: Calculate the MD5 checksum of the binary payload COBS-encode the binary payload. The note-c library includes a NoteBinaryEncode method to simplify…

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## [NoteHub to Image data](https://discuss.blues.com/t/notehub-to-image-data/1510)

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**Author:** [@Pradeep](https://discuss.blues.com/u/Pradeep)\
**Replies:** 5\
**Last updated:** [July 21, 2023, 2:56pm UTC](https://discuss.blues.com/t/notehub-to-image-data/1510 "2023-07-21T14:56:07Z")

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Hi All, I’m trying to send and receive an image payload using a notecard. I can see my encoded image payload in the notehub, but I can’t read back the payload. I’m using this ref python script (https://github.com/C…

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## [How is Data routing through MQTT possible in Notehub?](https://discuss.blues.com/t/how-is-data-routing-through-mqtt-possible-in-notehub/922)

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**Author:** [@Eldho](https://discuss.blues.com/u/Eldho)\
**Replies:** 2\
**Last updated:** [August 4, 2022, 2:04pm UTC](https://discuss.blues.com/t/how-is-data-routing-through-mqtt-possible-in-notehub/922 "2022-08-04T14:04:53Z")

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Hi Everyone, I was playing around with Notecard and notehub, when I tried to route data from notehub.io to other cloud using MQTT I found that there is not option to insert client ID in notehub I think no MQTT is possib…

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## [New Notecard Guide For End-To-End Encryption](https://discuss.blues.com/t/new-notecard-guide-for-end-to-end-encryption/325)

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**Author:** [@bsatrom](https://discuss.blues.com/u/bsatrom)\
**Replies:** 6\
**Last updated:** [October 9, 2021, 1:55am UTC](https://discuss.blues.com/t/new-notecard-guide-for-end-to-end-encryption/325 "2021-10-09T01:55:29Z")

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Happy Monday everyone! I just wanted to drop in and let you all know what we’ve just published a guide showing off how to encrypt your Notes before sending them to the Notehub. The guide contains a full walkthrough of th…