Authentication.md (786B)
1 # Authentication 2 3 **Source:** Cryptography and Network Security 4 5 **Chapter:** 1.4 6 7 **Definition:** Authentication is a service to ensure communication is authentic. 8 9 The difference between authentication and authorization is authentication ensures you are who you say you are and authorization ensures you are able to do what you are trying to do. 10 11 ### Peer Entity Authentication 12 13 Peer entity authentication ensures the person you are talking to is who they say they are. This ensures masquerading and replay attacks don't work. 14 15 ### Data Origin Authentication 16 17 Data origin authentication ensures the data originated from the person who it claims to originate from. Think ensuring an email comes from the person it says it does, this is not ongoing communication, the data is at rest.