steganograph 啥意思？

隐藏学(Steganography)一词是源自於一位德国的修道院住持Johannes Trithemius。他说到"隐藏学:是一种把讯息隐藏在人的心中的一种技术"。

Steganography is the art and science of writing hidden messages in such a way that no one apart from the intended recipient ... Steganography uses in electronic communication include steganographic coding inside of a transport layer