Resolving "deprecated SHA1 algorithm" warning popup

New Here ,
Jul 17, 2017 Jul 17, 2017

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So I click on a signature field to sign using my TOPAZ signature pad, and get a warning popup saying I am using a deprecated SHA1 algorithm and terrible things might happen.  I click OK and sign anyway.  Not sure how to stop using or replace the SHA1.  Do this in Acrobat Pro XI or contact TOPAZ?  Or update Windows? Thx

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Security digital signatures and esignatures

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correct answers 1 Correct answer

Adobe Employee , Jul 24, 2017 Jul 24, 2017

Hi Txswebb,

Here is the page that describes the details of the SHA1 warning dialog you are seeing. Applying a digital signature using the deprecated SHA1 algorithm warning message  As you can see, the issue may be a limitation in your Topaz device or certificate.

It may also be that a registry key is set to create signatures with SHA1. Please check for the aSignHash key as mentioned on the warning page. If that key is not present, then likely the warning is due to a limitation of your device/tok
...

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Adobe Employee ,
Jul 24, 2017 Jul 24, 2017

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Hi Txswebb,

Here is the page that describes the details of the SHA1 warning dialog you are seeing. Applying a digital signature using the deprecated SHA1 algorithm warning message  As you can see, the issue may be a limitation in your Topaz device or certificate.

It may also be that a registry key is set to create signatures with SHA1. Please check for the aSignHash key as mentioned on the warning page. If that key is not present, then likely the warning is due to a limitation of your device/token.

-Tariq Dar

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Community Beginner ,
Apr 30, 2022 Apr 30, 2022

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So my device is a brick? I guess that's why they were "Used".

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