Encryption is a means to hide text to maintain document confidentiality. One of the key-encryption techniques is homomorphic encryption, which permits operations. Algorithms support heteromorphic encryption of any scheme. Different encryption techniques would get the same result after long computations. Although homomorphic encryption has benefited a great deal, the applications using this invention must be shown. Several fundamental studies have been published lately on the utility of homomorphic encryption systems. More papers on homomorphic encryption have been produced to respond to the requirement for many implementations. This section also includes vehicle-to-encryption (v2v2V) and distributed blockchain networks and healthcare and data industries developments. This article seeks to consolidate current findings on homomorphic encryption and approaches to protecting confidentiality. The major priority is the above implementations.