After circuit extension to the second Node, I realized that the OR at the second node can decrypt my cells and successfully process my circuit extension request to increase my circuit length to three but i can't decrypt the response from the same OR. At first I thought maybe I was messing up the key for backward encryption (should be decryption but it is counter mode crypto) but i realized it wasn't true. I extracted both the KF and KB at the same time and the crypto scheme is also the same for encryption and decryption since it is a counter mode AES operation. From the tor protocol specification, I will have to remove all skins starting with the immediate OR towards the exit Node. When the application of the above specification failed to decrypt the cell successfully, i decided to remove the skins in reverse order but this also failed. I'm really confused at the moment. Aren't each successive AES counter operation independent of the previous?