On Subsribe Decryption not wroking in net framewrok

[KuwarPratapSingh]

Dear Team,

Can someone help us on below problem getting at the time of subscribe .

What key should we use for decrypt the encryption get from on subscribe .

Also do you have any utility in dot net framework .

Error :-
Invalid algorithm specified.

private ECDiffieHellmanCng LoadPrivateKey(string encPrivateKey)
{

        byte[] privateKeyBytes = Convert.FromBase64String(encPrivateKey);
        CngKey cngKey = CngKey.Import(privateKeyBytes, CngKeyBlobFormat.Pkcs8PrivateBlob);
        return new ECDiffieHellmanCng(cngKey);

 
    }

[KuwarPratapSingh]

Can anyone help on this issue