Write a secret message on the yellow paper ... Spray the paper with the window cleaner again and describe what happens. Download this worksheet to record your observations. Acid-base indicators can ...

When you have solved the message please stand by your desk. Remember it’s a secret, so don’t tell what it is until I call on someone.” The teacher will distribute the Code Talkers Worksheet ...

In steganography, an ordinary message masks the presence of a secret communication. Humans can never do it perfectly, but a new study shows it’s possible for machines. On June 27, 2010, the FBI ...

It also brought attention to steganography, a way of disguising a secret message within another message. The New York spies hid their secrets in plain sight, encoding communications within the ...