Cryptography and Network Security

Homomorphic encryption has the same aim as other encryption-decryption mechanisms: maintaining confidentiality, security, privacy, etc.  In this blog, we will see homomorphic encryption and its type.  Homomorphic Encryption (HE):  It is an encryption that computes operations over encrypted data without decrypting it (or without the need for a secret key).  Mathematically speaking in a client-server architecture: client has message 'm' and function f. The task of client is to compute f(m). Due to computational expensiveness (maybe one of the reason) client sends encryption of message (say Enc(m)) and 'f' to the server. Server will compute function over encrypted message, that is, f(Enc(m)), and return the result to the client, that is, Enc(f(m)). Client will decrypt it Dec(Enc(f(m)), that is, f(m). Hence, client achieves f(m).  Let's understand HE with our daily life (Tea making process): Figure 1. Here m is message, Enc is encryption, f is function, and Eval in...