如何使用PHP和Vue.js开发防御敏感数据篡改攻击的应用程序

function encrypt($data, $key) {
    $cipher = "aes-256-cbc";
    $ivlen = openssl_cipher_iv_length($cipher);
    $iv = openssl_random_pseudo_bytes($ivlen);
    return base64_encode(openssl_encrypt($data, $cipher, $key, OPENSSL_RAW_DATA, $iv) . '::' . $iv);
}

function decrypt($data, $key) {
    $cipher = "aes-256-cbc";
    list($encryptedData, $iv) = explode('::', base64_decode($data), 2);
    return openssl_decrypt($encryptedData, $cipher, $key, OPENSSL_RAW_DATA, $iv);
}

<template>
  <div>
    <input v-model="username">
    <p>{{ usernameError }}</p>
    <input type="password" v-model="password">
    <p>{{ passwordError }}</p>
    <button @click="submit">提交</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      username: '',
      password: '',
      usernameError: '',
      passwordError: ''
    }
  },
  methods: {
    submit() {
      this.usernameError = ''
      this.passwordError = ''
      
      if (this.username === '') {
        this.usernameError = '用户名不能为空'
      }
      
      if (this.password === '') {
        this.passwordError = '密码不能为空'
      }
      
      // 其他验证逻辑
      
      if (this.usernameError === '' && this.passwordError === '') {
        // 数据校验通过，可以提交数据
        // ...
      }
    }
  }
}
</script>