What is Homomorphic Encryption?
A form of encryption that allows computations to be performed on encrypted data without decrypting it first, preserving privacy during processing.
Homomorphic encryption is often called the "holy grail" of cryptography because it allows data to be processed while remaining encrypted.
How It Works
- Data is encrypted before being sent to a server
- The server performs calculations on the encrypted data
- Results are returned still encrypted
- Only the data owner can decrypt the results
Types
- Partially Homomorphic: Supports one type of operation (addition OR multiplication)
- Somewhat Homomorphic: Supports limited operations of both types
- Fully Homomorphic (FHE): Supports arbitrary computations on encrypted data
Real-World Applications
- DERO blockchain: Uses homomorphic encryption for private transactions and smart contracts
- Cloud computing: Process sensitive data without the cloud provider seeing it
- Medical research: Analyze patient data without exposing individual records
- Voting systems: Tally votes without revealing individual ballots
Current Limitations
Fully homomorphic encryption is computationally expensive — operations on encrypted data are much slower than on plaintext. But performance is improving rapidly.
Related Terms
Encryption
The process of converting information into a code to prevent unauthorized access. Encryption transforms readable data (plaintext) into an unreadable format (ciphertext) using a cryptographic algorithm and key. Only those with the correct key can decrypt and read the original data.
Zero-Knowledge Proof
A cryptographic method by which one party can prove to another party that they know a value, without conveying any information apart from the fact that they know the value. This allows authentication and verification without exposing sensitive data.
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