Not the specific Target related answer you're looking for, but 
knowledge!
An RSA token is either a software token or a hardware token that provides you a number usually in a 30 or 60 second rotating interval.  When you log in to something, the token is entered in conjunction with your password.  Auth tokens are the basis of multi-factor authentication.
	
	
		
			
			
				
				
				
					
						
							
						
					
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