Encrypted messages could be hidden within a normal-looking conversation on social mediaTero Vesalainen/iStockphoto/G​etty Images Secret messages can be hidden inside fake conversations generated by AI chatbots. The technique could give people a way to communicate online without arousing the suspicion of oppressive governments. When messages are encrypted for secure transmission, the resulting cipher text – an unusual string of garbled characters – stands out like a sore thumb. That is fine if you are keeping secrets in a country where secrets are allowed, but under brutal dictatorships, this could land a citizen in hot water. Even the UK government recently …