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a digital signature confirms the identity of the person who sent the workbook and is issued by a certification authority or CA a trusted third party that is it contains a serial number digital signature of issuing authority expiration dates name and copy a certificate holders public key so the user can then verify that that certificate is authentic and so once the signature is attached to the document it canamp;#39;t be modified without first removing the digital ID so it doesnamp;#39;t prevent anybody from removing it it simply means that if itamp;#39;s not there then it may not be from the person who you think it is and or changes have been made and thereamp;#39;s no way to know or find out what changes have been made in that case you want to contact the person and ask them if ill digitally sign it again because one of the three things have happened again either the sender forgot to sign it or someone else whoamp;#39;s pretending to be the person that is trying to docHub you is d