![]() ![]() Steganography also includes the practice of writing in invisible ink. ![]() The solution penetrates the porous shell, and leaves a message on the surface of the hardened egg albumen, which can be read only when the shell is removed. In the sixteenth century, the Italian scientist Giovanni Porta described how to conceal a message within a hard-boiled egg by making an ink from a mixture of one ounce of alum and a pint of vinegar, and then using it to write on the shell. The messenger would then swallow the ball of wax. For example, the ancient Chinese wrote messages on fine silk, which was then scrunched into a tiny ball and covered in wax. In the two thousand years since Herodotus, various forms of steganography have been used throughout the world. Secret communication achieved by hiding the existence of a message is known as steganography, derived from the Greek words steganos, meaning ‘covered’, and graphein, meaning ‘to write’. ![]()
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