This Valentine's Day, send that someone special something *truly* private ;)
Use homomorphic encryption to send a ~super secret~ valentine at valentine.blyss.dev!
Sure! Essentially, the client encrypts its query in a special way and sends this to the server. The server can evaluate the encrypted query on the database, and get an encrypted result, but can't learn anything about the query/result.
Blog post: blintzbase.com/posts/pir-and…
Diagram:
ALT Diagram of how private information retrieval using homomorphic encryption works. 1. Build a one-hot vector for the desired index "3" 2. Encrypt each bit using the secret key 3. Send the ciphertexts to the server 4. Homomorphically multiply each ciphertext by a database item 5. Homomorphically add all the ciphertexts 6. Send a ciphertext back to the client 7. Decrypt and obtain the desired item