Authenticity

Authenticity-

Authenticity allows us to talk about the proper attribution as to the owner or creator of the data in question. For example, if we send  an e-mail message that is altered so  as to  appear to  have  come from  a different e-mail address than the one from  which it was actually sent,  we would be violating the  authenticity of the e-mail. Authenticity can be enforced through the use of digital signatures. A very similar, but reversed, concept to this is non-repudiation.  Non-repudiation prevents someone from taking an action, such as sending an e-mail, and then later denying that he or she has done so.