Homomorphic Encryption Approach for String Concatenation

In a modern environment, a large amount of data is generated from various sources like healthcare, government, banking, and other different sectors. The traditional method for storing information is becoming challenging to handle big data. The solution to storing big data is to store data on third-party service providers. Data protection is the primary concern for storing and accessing data due to the emerging rate of data breaches and adversaries in personal data storage. Intruders manage to access sensitive data despite many efforts to protect sensitive data. Homomorphic encryption is a data protection approach in the cryptographic domain that can perform computations on cipher data without decrypting it. The computation outcome is encrypted; the output will be the same when decrypted as if the operations had been performed on the original plaintext data. This encryption method for privacy-preserving outsourced storage and computation permits the data to be encrypted and outsourced to cloud environments for further processing. This paper proposes string concatenation on encrypted data using the Advanced Encryption Standard algorithm with cipher blockchain mode of operation.