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homenc / HElib

HElib is an open-source software library that implements homomorphic encryption. It supports the BGV scheme with bootstrapping and the Approximate Number CKKS scheme. HElib also includes optimizations for efficient homomorphic evaluation, focusing on effective use of ciphertext packing techniques and on the Gentry-Halevi-Smart optimizations.
https://homenc.github.io/HElib
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Write Context to stringstream and readfrom stringstream but the generated seckey cannot be used in decryption #450

Open DylanWangWQF opened 3 years ago

DylanWangWQF commented 3 years ago

Hi, I have a question, when I generate a new context by reading from stringstream, these two context should be equal. But if I encrypt the vector using the oldContext.publickey, then decrypt it using the newContext.seckey. It failed due to different context. @dubek @fionser @faberga Could you give me some suggestions?

context.writeTo(ss);
Context newContext = Context::readFrom(ss);

SecKey secret_key(newContext);
secret_key.GenSecKey();
addSome1DMatrices(secret_key);
const PubKey& public_key = secret_key;
const helib::EncryptedArray& newEa = newContext.getEA();

vector<long> inputtest(256);
    for (long i = 0; i< 256; i++) {
        inputtest[i] = i;
    }

cout << inputtest << endl;
Ctxt inputCtxt(meta.data->publicKey);
ea.encrypt(inputCtxt, meta.data->publicKey, inputtest);

vector<long> outputtest1;
newEa.decrypt(inputCtxt, secret_key, outputtest1); // error: cannot decrypt due to different context