A financial institution is upgrading its data protection measures to comply with stringent new privacy regulations. They want to perform analytics on encrypted customer data without decrypting it, to avoid exposing sensitive information during processing. Which advanced cryptographic technique enables computation on ciphertext, yielding an encrypted result that, when decrypted, matches the result of operations performed on the plaintext?
- AHomomorphic Encryption
- BSymmetric Encryption
- CHashing
- DAsymmetric Encryption
Show answer & explanationAnswer & explanation
Correct answer: A. Homomorphic Encryption
Homomorphic encryption is an advanced cryptographic technique that allows computations to be performed on encrypted data without first decrypting it. The result of these computations remains encrypted and, when decrypted, is the same as if the operations had been performed on the plaintext data. This is crucial for privacy-preserving analytics.
Why the other options are wrong
- B. Symmetric encryption encrypts/decrypts data with one key but doesn't allow computation on ciphertext.
- C. Hashing creates a fixed-size digest and is for integrity, not encryption or computation on data.
- D. Asymmetric encryption uses key pairs for encryption/decryption, signatures, but not computation on ciphertext.
Homomorphic Encryption
A form of encryption that allows computations to be carried out on ciphertext, producing an encrypted result which, when decrypted, matches the result of the operations as if they had been performed on the plaintext. It is a powerful tool for privacy-preserving data processing.
- Enables cloud computing and data analytics on sensitive encrypted data.
- Comes in partially, somewhat, and fully homomorphic forms.
- Computationally intensive, but actively being researched for efficiency.
Memory trick: Homomorphic means 'same structure' or 'same form' – computations on encrypted data yield results that have the 'same form' as if done on unencrypted data.