The forward slash in Excel is used as the ________ sign

How much free storage does SkyDrive make available to you?

A) 10 GB B) 7 GB C) 50 GB D) None—you must pay to use SkyDrive

The process of reversing public key encryption to verify that a message was sent by a specific sender and thus cannot be refuted is known as __________.

Fill in the blank(s) with the appropriate word(s).