ezPictograph is the best steganographic ios app. You can use it to send messages and images without anyone knowing. You know! Steganography is the best practice to hide messages in plain sight. ezPictograph works by changing the least significant bits in each pixel in in such a way that a message will be hidden. AES-256 encryption is used in ezPictograph when encryption is enabled. This encryption is incredibly hard to break, so rest assured your message will be safe if you choose to encrypt it.