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Work · August 5, 2013

DH

Distributed Homomorphic Encryption Adder (Weekend Project)

Distributed Homomorphic Encryption Adder (Weekend Project) launched on August 5, 2013 with 104 votes, #18 of 475 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 13 years on.

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In plain words

Distributed Homomorphic Encryption Adder is a weekend project that performs addition on encrypted numbers without revealing the data to any party involved. Users encrypt numbers locally and send them to a centralized server, which distributes them to peers for addition. The peers return encrypted results without ever seeing the actual numbers. The system uses the Paillier Cryptosystem, a mathematical method that enables arithmetic operations on encrypted data, allowing distributed computation while maintaining complete data privacy throughout the process.

written from the facts on this page · September 2026

From the sources

Addition is done by encrypting the numbers and then sending them to a centralized server. The centralized server then redistributes the two numbers to peers, who add them. The peers send the result back to the server, who sends it back to your computer, and your computer decrypts it. However, the numbers are never decrypted by the server or the peers. These peers have added two numbers together without even knowing what they are. This is done using a mathematical construction known as the Paillier Cryptosystem . The Paillier Cryptosystem only allows for the addition of numbers, it supports what is known as Partially Homomorphic Encryption scheme. Recently (2009), Craig Gentry constructed a…from 9ac345a5509a.github.io

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