Notice / order signed with expired digital signature

Is any notice or assessment order digitally signed using an expired digital signature of assessing officer valid in law ? Is there any specific provision under the Information Technology Act, 2000 or any other law with respect to use of digital signature on any document / notice / order? Whether the provisions of section 282A of the Income Tax Act, 1961 would come to rescue of the assessing officer who has signed the notice / order with expired digital signature ? Kindly guide.

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