... certificate’s authentici ty verifies the issuing CA’s digital signature, and hence, the integrity of the contents of the certificate (most importantly, the public key and the identity of the certificate ... without a PKI, it is the job of the CA to check the authenticity of allPGP certificates and then sign the good ones. Basically, the main purpose of aCA is to bind a public key to the identification ... cases, the algorithm is tooffset the alphabet and the key is the number of characters to offset it.For example, if we encode the word “SECRET” using Caesar’s key value of 3,we offset the alphabet...