What is homomorphic encryption?
Asked on 2024-07-30
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Homomorphic encryption is a form of encryption that allows computations to be performed on encrypted data without needing to decrypt it first. This means that a server can process the encrypted data and return an encrypted result, which can then be decrypted by the client to reveal the final output. This technique ensures that sensitive data remains secure and private even while being processed.
In the context of WWDC, homomorphic encryption is mentioned in the session What’s new in privacy. It is used in the implementation of Live Caller ID, enabling a server to make use of an encrypted value without decrypting it, thus preserving user privacy. The server computes on the incoming ciphertext, evaluates for a match, and then returns the transformed ciphertext back to the requesting device, where the results are displayed. This allows for the implementation of live caller ID without revealing sensitive information such as an incoming phone number.
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