Many methods are used to encrypt and decrypt a message. Coding a message in a way so as to make it unreadable for others is called Encryption, and making it readable again is called decrypting it. You need the same code to encrypt/decrypt a message – this code is called a cipher.
Morse code is a very common coding technique, in which each letter is represented by a sequence of dots and dashes. This was developed by Samuel F.B. Morse. For emergency signals, Morse code can be sent by way of improvised sources that can be easily "keyed" on and off, making Morse code one of the most versatile methods of telecommunication in existence. The most important Morse code is SOS – Save our Souls.
There are other ways of encoding a message. You and your friend can substitute each alphabet of your message with another and form a personal cipher! You can also use invisible ink and do some serious spying around!!!
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