Your employer recently instituted a new policy that requires employees to sign all internal email communications with their digital certificate. If each employee is using their own unique digital signature what will this provide for the company?
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Answer Description
Non-repudiation links an action to an individual using a unique identifier. For example, it provides assurance that an email was actually sent by the sender or it connects a user to a change they made on the network so they can't deny they made the change.
Wikipedia
In law, non-repudiation is a situation where a statement's author cannot successfully dispute its authorship or the validity of an associated contract. The term is often seen in a legal setting when the authenticity of a signature is being challenged. In such an instance, the authenticity is being "repudiated".For example, Mallory buys a cell phone for $100, writes a paper cheque as payment, and signs the cheque with a pen. Later, she finds that she can't afford it, and claims that the cheque is a forgery. The signature guarantees that only Mallory could have signed the cheque, and so Mallory's bank must pay the cheque. This is non-repudiation; Mallory cannot repudiate the cheque. In practice, pen-and-paper signatures aren't hard to forge, but digital signatures can be very hard to break.
Non-repudiation - Wikipedia, the free encyclopedia 