![]() And Hebrew scholars were using substitution ciphers as far back as 500 or 600 BC. For example, clay tablets found in Mesopotamia dating from 1500 BC had an encrypted recipe for pottery glaze. Historically, cryptography methods primarily involved the use of pen and paper encryption or simple mechanical aids. There are records showing cryptography has been used for thousands of years. A brief history of cryptographyĬryptography is the use of codes and ciphers to keep information secret. In this post you will find lots of great info about secret codes for kids, including a brief history of cryptography, an explanation of the difference between codes and ciphers, and information about five codes and ciphers that have been used at various times throughout history to communicate messages.įor each of the five codes and ciphers featured in this post, I have created a printable you can download with instructions on how to encrypt and decode messages using that code/cipher. I used to create mini scavenger hunts for my students as a very motivating way for them to practice their reading skills.Īnd now I use secret codes with my kids to challenge not only their reading skills but also their critical thinking and logic skills. We would wake up to one clue and have to follow it to the next clue and the next until we found our baskets.Īs a child, and now into adulthood, I have loved creating secret codes and leaving clues for people to find special things. I think it started when I was little and my parents the Easter bunny would put together a scavenger hunt for my brother and I to find our Easter baskets each year. In our family we love playing with secret codes for kids. Performing this by hand would be nearly the same as a Caesar alphabet, but you would write the scrambled alphabet instead of a sorted alphabet on both the outer and inner wheel rings (or top and bottom pieces of paper).This post may contain affiliate ads at no cost to you. You can make the cipher more complicated by shuffling the alphabet by using a key. ![]() Alternately, the cryptogram solver can manually help you solve ciphers using this method. To decode something, subtract the encryption N from 26 and it should be decoded for you. To encode something, just pick an N and type in your message. Caesar originally shifted by 3 letters, so A -> D, B -> E, and so on, which was good enough for that time. You can rotate the wheels so that ABC lines up with any series of letters, such as BCD or even a match much further of QRS. This is where an inner wheel has the alphabet around the outside, and that is placed upon an outer wheel, also with the alphabet going around it. This sort of cipher can also be known as a wheel cipher. A simple test to see how this works would be to use the alphabet as the input and see the output while changing the value of N. ![]() Line them up so the top strip's A matches the bottom strip's D (for example) and then you can encode. To perform this shift by hand, you could just write the alphabet on two strips of paper. This is an offshoot of the rot13 encoder. It's a style of substitution cipher where you can add one, two, or any number up to 25 to your string and see how it changes. This is a standard Caesarian Shift cipher encoder, also known as a rot-N encoder.
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