Caesar cipher part 1

Download 1M+ code from https://codegive.com/6127d08 okay, let's dive into the caesar cipher, the granddaddy of substitution ciphers! this is part one of a likely multi-part tutorial. we'll cover the basics, implementation in python, and some initial limitations. **caesar cipher tutorial: part 1 - the fundamentals** **1. introduction: a historic cipher** the caesar cipher, also known as a shift cipher, is one of the simplest and most widely known encryption techniques. it's a type of *substitution cipher* where each letter in the plaintext (the original message) is replaced by a letter some fixed number of positions down the alphabet. legend has it that julius caesar used this cipher to communicate with his generals, hence the name. while it might seem incredibly basic by today's standards, it provides a perfect starting point for understanding the core concepts of cryptography. **2. how it works: the mechanism of shifting** at its heart, the caesar cipher relies on a fixed *key*. this key represents the number of positions each letter is shifted down the alphabet. let's use an example: * **key:** 3 now, let's encrypt the letter 'a'. we shift it three positions down: a - b - c - d so, 'a' becomes 'd'. similarly: * 'b' becomes 'e' * 'c' becomes 'f' * ...and so on. what happens when we reach the end of the alphabet? that's where the "wrapping around" comes in. if we're encrypting 'x', 'y', or 'z', we cycle back to the beginning of the alphabet: * 'x' becomes 'a' * 'y' becomes 'b' * 'z' becomes 'c' **3. encryption and decryption: the two sides of the coin** * **encryption:** the process of converting plaintext into ciphertext (the encrypted message) using the key. * **decryption:** the reverse process of converting ciphertext back into plaintext, also using the key. for the caesar cipher, decryption is simply shifting the letters *backwards* by the key value. **example:** * **plaintext:** hello * **key:** 3 * **ciphertext:** khoor to decrypt, we shift each letter in " ... #CaesarCipher #Cryptography #appintegration Caesar cipher encryption decryption substitution cipher cryptography shift cipher classic encryption encoded message cipher algorithm security text transformation historical cipher secret codes cryptanalysis digital security