Easy encrypto5/30/2023 Symmetric cryptography has come a long way and has many practical purposes. Using amazing math and the help of computers, a key can be generated that is much, much larger, and is much, much harder to guess. Thankfully, encryption has come a long way since the Caesar cipher. The Caesar cipher is a weak form of symmetric cryptography. When there is one key to encrypt and decrypt, like in this example where it’s a simple number of 3, it is called symmetric cryptography. The method of shifting the alphabet by three characters is a historic example of encryption used by Julius Caesar: the Caesar cipher. In other words, they can persistently guess until they get the answer to decrypt the message. Someone could “brute force” the key by trying all the possible combinations. If Julia and César use a simple key of 3 to encrypt, and a key of 3 to decrypt, then their gibberish encrypted message is easy to crack. Julia decides to encrypt her message with a key of 3, shifting the letters down the alphabet by three. They are also making copies of this message before passing it on and noting the time at which Julia is sending this message to César. Although neutral, the intermediaries are nosy and can easily sneak a peek at the message before passing it on. Julia’s note passes through a bunch of intermediary classmates before reaching César. Julia wants to send a note to her friend César that says “Meet me in the garden,” but she doesn’t want her classmates to see it. Symmetric Encryption: A Story of Passing Secret Notes with a Single Key anchor link
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