An e signature allows you to attach an electronic version of your signature to files, documents and other forms. You need to be careful when using this signature method as some electronic signatures are not secure. Unsecure signatures are suitable for certain types of electronic data like generic emails, but should never be used on important documents including payroll approvals, purchase requisitions, and contracts.
You Need a Digital Certificate to Convert an E Signature into a Secure Signature
In order to make an e signature secure you need to convert it into a digital signature. A digital signature can be created by making a digital certificate and putting the signature in the certificate. Anytime the signature is applied to electronic data the document, form or file will contain a signature which is encrypted. Depending upon the required level of encryption, the actual data may also be encrypted and protected using the same digital certificate.