Message Authentication Code
{"Image DocumentName": "Message Authentication Code", "Image ImageDescription": "MAC \u2013 proves (relatively) that each packet in a stream is from a host that authenticated. Each packet with a MAC is authenticated. Most MAC s, such as HMAC, are hash schemes. By hashing the packet in some manner with a key and constants they prove the packet was unchanged. Having nothing to do with the encryption of data, they are only authentication.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}