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Go implementation of (MK)TFHE scheme

License: Apache License 2.0

Go 95.89% Assembly 4.11%
homomorphic-encryption lattice-based-crypto tfhe

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tfhe-go's Issues

Wrong Bootstrapping result after addition.

I write some simple code as below:

params := tfhe.ParamsUint4.Compile()
enc := tfhe.NewEncrypter(params)
defer enc.Free()
evalKey := enc.GenEvaluationKeyParallel()
eval := tfhe.NewEvaluater(params, evalKey)
defer eval.Free()
a := enc.EncryptLWE(13)
b := enc.EncryptLWE(7)
c := eval.AddLWE(a, b)
fmt.Println(enc.DecryptLWE(c))
c = eval.Bootstrap(c)
fmt.Println(enc.DecryptLWE(c))

The output is 4 12.

When the addition result c is larger than the modulus 16, it seems the bootstrap result is always 16-c. May I ask if this is a bug or an inherent result?

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