Can the cloud add up your data without reading it?
Hospitals want statistics. Normal analytics has to unlock every record first.
Locked on disk. Open the moment it is used.
To compute, the server decrypts every record.
Insiders can read it in memory.
Hacked hosts and malware can scrape it.
Removing names does not hide people.
Compute on data that stays locked.
The cloud adds ciphertext. Only the hospital can read the total.
Locked before it leaves the hospital.
A fresh key for every campaign. Names and IDs never leave.
The cloud adds. The hospital opens.
Multiply the locks, add the values.
Paillier encryption is additive. The cloud never needs the key.
Five checks before anything opens.
Signature, log, input root, record count and a local recompute.
Anyone can audit it.
A public, signed log. An auditor needs no key and no trust.
Encrypted. Added blind. Checked by anyone.
scan to try it on your phone
From key to checked result.
A fresh Paillier keypair for each campaign.
Identifiers dropped. Every measure encrypted.
The cloud signs a Merkle root over every record.
Grouped sums computed on ciphertext.
Five checks, then decrypt and chart.
Four facts, and how we know.
Ten departments, fully synthetic.
Choose 1024 or 2048 per campaign.
Paillier against CKKS, 2 million records.
No individual can be singled out.
Storage figures come from our own benchmark. No real patient data is used.