The need to concealthe important messages has persisted throughout history, be it wars or be it politics.
A code replaces eachword in a message with a code word or symbol, whereas a cipher replaceseach letter in a message with a cipher letter or symbol.
This is Now you knowand today in this video, we will tell you about 4 interesting codes and ciphersthat has existed for thousands of years.
1. Morse Code
It is not a code buta cipher. This cipher replaces eachletter of the alphabet, the digits 0-9, and certain punctuation symbols, by asequence of short and long beeps, called "dots and dashes." It is not used to concealmessages but to send messages instantaneously at long-distances.
2. ROT1 Cipher
ROT1 means "rotate 1letter forward." In this cipher, each letterof the alphabet is replaced with the following letter, so A is replaced with B, Bis replaced with C and so on. It is very easy to decipher andis not suitable for serious use but surely can be used to pass secret personalmessages.
3. Tap Code
In this, the messagesare transmitted using a series of tap sounds, it was used by Vietnamprisoners to communicate, done by tapping on pipes or metalbars or the walls inside a cell. The communication of eachletter is done by tapping two numbers, one for horizontal row and otherfor vertical column.
4. Transposition Cipher
In this, the lettersare rearranged according to some key or rule. The transposition key couldbe words written in backwards or to swap every pair ofletters, this cipher was used to sendsensitive messages during the First World War and the American Civil War.
Have you used any ofthese ciphers?
