How can characters be encrypted in the C language?

2 years ago
Olivia Parker
2 minutes

In the C language, simple algorithms can be used to encrypt characters. Here’s a basic example using the Caesar cipher algorithm to encrypt characters:

#include <stdio.h>

// 加密函数
char encryptChar(char c, int key) {
    if (c >= 'a' && c <= 'z') {
        c = (c - 'a' + key) % 26 + 'a';
    } else if (c >= 'A' && c <= 'Z') {
        c = (c - 'A' + key) % 26 + 'A';
    }
    return c;
}

int main() {
    char text[100];
    int key;

    printf("请输入要加密的文本：");
    scanf("%s", text);

    printf("请输入密钥：");
    scanf("%d", &key);

    // 对每个字符进行加密
    for (int i = 0; text[i] != '\0'; i++) {
        text[i] = encryptChar(text[i], key);
    }

    printf("加密后的文本：%s\n", text);

    return 0;
}

In this program, the encryptChar function is used to encrypt a single character. It takes a character and a key as parameters, shifts the character based on the key, and returns the encrypted character.

In the main function, we first obtain the text and key to be encrypted. Then, we use a loop to call the encryptChar function for each character in the text. Finally, we print the encrypted text.

Please note that this example is just a simple encryption algorithm and does not provide strong security. For more secure encryption, consider using complex algorithms such as AES or DES.

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