Definition
Homomorphic encryption is a form of encryption that allows computations to be performed on encrypted data without decrypting it first. This means that sensitive information can be processed by a third party, like a cloud provider, while remaining protected from unauthorized access. The process involves using specialized algorithms that manipulate the ciphertext directly, producing an encrypted result that, when decrypted, matches the result of computations performed on the original plaintext. This capability is crucial for maintaining data privacy in cloud computing environments and for enabling secure data analysis in collaborative settings. For instance, a financial institution could allow a cloud service to analyze transaction data for fraud detection without ever exposing the raw account details. Unlike standard encryption, which requires decryption before processing, homomorphic encryption keeps data protected throughout its computational lifecycle. This concept is relevant for cybersecurity professionals and appears on exams like CompTIA Security+ and CISSP.