Sooner or later you or your company will have to send, share, sell or publish a digital file. Then, you will have to be sure that file will maintain its integrity once it's received or downloaded by a customer, a collaborator, a company, a friend, etc.
In this case you have no chance but to calculate the hash of that file. At the same time, who receives or download the file, should be able to verify the file’s integrity.
For example, imagine that you will send a sensitive PDF file to an important customer. Both of you need to know to have to do with the very same file. Files Integrity is the answer! You will create a hash of the file, the customer will verify its integrity!
* Creating a hash of a file:
Select the encryption type: MD5 or SHA-1. Then, select “Create” and drag a file from the Finder and drop it on the highlighted box.
Just below the box you will see the file’s hash.