Signature invalid

Forum|Forum|1 year ago
January 29, 2025
1 reply
986 views

In PDF file, signature shows as invalid. Please guide how to resolve this issue.

PDF

Participating Frequently

If that signature had originally been valid at all, the file meanwhile has been changed somehow which broke the signature. Such a change may have been an explicit manipulation of the file or it may have been the result of damage in the file caused by inappropriate storage (e.g. storage in a database field configured for text content).

No matter how that change came up, to resolve the issue you need to ask the source of the file for another, not broken copy of the file.

PS: Another option could be that the signature had been broken from the start. In that case you should inform the signer.

P

Prashanth_SNAuthor

Participant

Again I have downloaded the file from original source but still it shows Signature invalid. When we click on the Signature invalid option, it shows "Error during signature verification." Signature contains incorrect, unrecognized, corrupted or suspicious data. Support Information: SigDict /Contents illegal data.

MikelKlink

Participating Frequently

Again I have downloaded the file from original source but still it shows Signature invalid.

Then you should contact the original source, inform them, and ask them for further steps. There are two major possible causes:

The original source currently has a problem and produces invalid signatures.
In this case you can hope they recognize their mistake and fix it.
The signing scheme used by the original source is non-standard and you are expected to use a different validator than Adobe Acrobat to validate.
In this case you can hope they'll point you towards a tool that validates their custom signature scheme.

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