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Homomorphic encryption is form of encryption which allows mathematical operations to be carried out on an encrypted message, using only the ciphertext. Cryptography.SE may be more suitable for some questions on this topic.
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votes
Difference between fully homomorphic and semi-homomorphic encryption
If you're happy with a more mathematical definition:
A Fully-Homomorphic Encryption preserves a ring-structure.
This means we have a Ring (R,+,*), where R are our bits on which we operate, (R,+) is …