Created
July 29, 2023 12:06
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Caesar Cipher is a simple substitution cipher that shifts characters in the plaintext by a fixed number of positions to generate ciphertext.
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| package main | |
| import ( | |
| "fmt" | |
| ) | |
| // Function to perform Caesar Cipher encryption | |
| func caesarEncrypt(plaintext string, shift int) string { | |
| ciphertext := "" | |
| for _, char := range plaintext { | |
| if char >= 'A' && char <= 'Z' { | |
| ciphertext += string((char-'A'+rune(shift))%26 + 'A') | |
| } else if char >= 'a' && char <= 'z' { | |
| ciphertext += string((char-'a'+rune(shift))%26 + 'a') | |
| } else { | |
| ciphertext += string(char) | |
| } | |
| } | |
| return ciphertext | |
| } | |
| // Function to perform Caesar Cipher decryption | |
| func caesarDecrypt(ciphertext string, shift int) string { | |
| return caesarEncrypt(ciphertext, 26-shift) // Decryption is just the reverse shift | |
| } | |
| func main() { | |
| plaintext := "Hello, World!" | |
| shift := 3 | |
| // Encryption | |
| encryptedText := caesarEncrypt(plaintext, shift) | |
| fmt.Println("Plaintext:", plaintext) | |
| fmt.Println("Encrypted:", encryptedText) | |
| // Decryption | |
| decryptedText := caesarDecrypt(encryptedText, shift) | |
| fmt.Println("Decrypted:", decryptedText) | |
| } |
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