When we think of VPNs, often our first thought is that of encryption of the user data. But adversaries or those intent on reading the data could However an attacker could record a conversation and then replay the replies between to participants. What we need to do is to be able to ensure the source of the data is genuine, and that is where digital signatures and certificates comes in.
To construct a Digital Signature, public key encryption systems must be in place. The construction of the Digital Signature entails applying a hash function to the message by concatenation of the message with a known secret key and then applying a mathematical function which will produce a fixed length output known as the digest. Read More