Section 67A of Evidence Act "Proof as to digital signature"
Except in the case of a secure digital signature, if the digital signature of any subscriber is alleged to have been affixed to an electronic record the fact that such digital signature is the digital signature of the subscriber must be proved.
Section 68 of Evidence Act "Proof of execution of document required by law to be attested"
If a document is required by law to be attested, it shall
not be used as evidence until one attesting witness at least
has been called for the purpose of proving its execution, if
there be an attesting witness alive, and subject to the
process of the court and capable of giving evidence :
[Provided that it shall not be necessary to call an
attesting witness in proof of the execution of any document,
not being a will, which has been registered in accordance
with the provisions of the Indian Registration Act, 1908 (16
of 1908), unless its execution by the person by whom it
purports to have been executed is specifically denied.]