Digital signature

A digital signature is a way to check the authenticity of a digital message or document. A valid digital signature is a proof that a message or document has been created by a well-known author, and that she has reached the recipient in the unmodified form. The text that follows will first be about the digital certificate, then how the user signature is inserted into the Excel, the digital certificate is appended and the digital signature of the document is generated.

Let’s calculate

Besides basic calculating operators like addition (+), subtraction (-), multiplication (*), and division (/) Excel contains even a handful of functions that we can use to perform various mathematical operations. Also, there are functions for calculating the absolute value, returning the number sign, and some other functions that can be of importance, for example, to create conditions in conditional formatting, when we want to color each different order in different colors …