A good explanation of homomorphic encryption

Homomorphic encryption is where one party (Alice) encrypts data and passes it to another (Bob) with an encrypted key. This means that Bob can’t read the data, but can perform computations on it, and pass the encrypted results (which Bob can’t read) to Alice, so that she can decrypt it with her key. This is especially useful in the age of cloud computing, webservices, SaaS and private records.

Alice and Bob in Cipherspace ยป American Scientist.

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