# SDK Encryption backward compatibility issue **URL:** \ **Category:** Web\ **Created:** [June 3, 2021, 9:55pm UTC](https://devforum.zoom.us/t/sdk-encryption-backward-compatibility-issue/51729 "2021-06-03T21:55:12Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![developer-whova](https://avatars.discourse-cdn.com/v4/letter/d/43a26b/32.png) [@developer-whova](https://devforum.zoom.us/u/developer-whova)\ **Post date:** [June 3, 2021, 9:55pm UTC](https://devforum.zoom.us/t/sdk-encryption-backward-compatibility-issue/51729/1 "2021-06-03T21:55:12Z")
I just want to rereport an occurring issue that happens every Zoom release new SDK, this seems to happen on all version releases since 1.8.5 - 1.9.5 ( present day ). I attached the image below both for **closed captioning and chat** there seems to be an encryption issue that causes the particular hex text being displayed instead of the actual caption / chat. It is fixed only if we **upgrade to the latest version** It seems in this case we need to keep upgrading on the same day the SDK is released which is quite annoying. ![image](https://us1.discourse-cdn.com/flex016/uploads/zoomdeveloper/original/3X/f/1/f1b4e81eca7cfd13ba63e11a9679e044dfc360e6.png) ---
**Author:** ![will.zoom](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/will.zoom/32/14417_2.png) [@will.zoom](https://devforum.zoom.us/u/will.zoom)\ **Post date:** [June 4, 2021, 8:27pm UTC](https://devforum.zoom.us/t/sdk-encryption-backward-compatibility-issue/51729/2 "2021-06-04T20:27:14Z")
Hi @developer-whova, Thanks for reaching out about this. To clarify, are you seeing this in the in-meeting chat? Additionally, can you confirm which version you saw this on most recently? If there are any additional details or screenshots you might be able to share, this would be helpful as well. Thank you, Will ---
**Author:** ![developer-whova](https://avatars.discourse-cdn.com/v4/letter/d/43a26b/32.png) [@developer-whova](https://devforum.zoom.us/u/developer-whova)\ **Post date:** [June 4, 2021, 8:39pm UTC](https://devforum.zoom.us/t/sdk-encryption-backward-compatibility-issue/51729/3 "2021-06-04T20:39:27Z")
Above is the closed captioning, but in general, you will also see it in the in-meeting chat for **SDK 1.9.1** to reproduce I think you can try create a meeting and try sending chat messages to each other from Zoom desktop client and the SDK ---
**Author:** ![MaxM](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/maxm/32/42303_2.png) [@MaxM](https://devforum.zoom.us/u/MaxM)\ **Post date:** [June 7, 2021, 10:13pm UTC](https://devforum.zoom.us/t/sdk-encryption-backward-compatibility-issue/51729/4 "2021-06-07T22:13:39Z")
Hey @developer-whova, Thank you for the update, are you able to share a little more information on how we can test this on our end? You have the Zoom Desktop Client and the previous version of the Web SDK - in this case 1.9.1. After 1.9.1 is released, you saw that issue with chat when using 1.9.1. Is that accurate? Thanks, Max ---
**Author:** ![developer-whova](https://avatars.discourse-cdn.com/v4/letter/d/43a26b/32.png) [@developer-whova](https://devforum.zoom.us/u/developer-whova)\ **Post date:** [June 7, 2021, 10:53pm UTC](https://devforum.zoom.us/t/sdk-encryption-backward-compatibility-issue/51729/5 "2021-06-07T22:53:02Z")
So yes Zoom release 1.9.5 after 1 week if you do chat from zoom desktop on **1,9,1** it shows as encrypted but on **1.9.5** it works fine, so the issue seems to relate to the encryption backward compatibility. This happens for both **chat and closed captioning.** ---
**Author:** ![MaxM](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/maxm/32/42303_2.png) [@MaxM](https://devforum.zoom.us/u/MaxM)\ **Post date:** [June 9, 2021, 4:58pm UTC](https://devforum.zoom.us/t/sdk-encryption-backward-compatibility-issue/51729/6 "2021-06-09T16:58:37Z")
Hey @developer-whova, Thank you for confirming. Please send an email to [developersupport@zoom.us](mailto:developersupport@zoom.us) with a link to this thread. In that email, please include a couple screenshots of the behavior you’re seeing. I’ll use that to convey the issue to our engineering team and investigate further. Thanks, Max ---
**Author:** ![system](https://us1.discourse-cdn.com/flex016/uploads/zoomdeveloper/original/3X/6/1/614bdd549b610bbaa46ff934617683a02bdaa03c.png) [@system](https://devforum.zoom.us/u/system)\ **Post date:** [July 10, 2021, 2:58am UTC](https://devforum.zoom.us/t/sdk-encryption-backward-compatibility-issue/51729/7 "2021-07-10T02:58:39Z")
Closed on July 10, 2021, 2:58am UTC This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.