diff --git a/index.js b/index.js
index 1fd1306..8b6e771 100644
--- a/index.js
+++ b/index.js
@@ -1285,55 +1285,6 @@ class TICrypto {
     return null
   }
 
-  /**
-   * 用户编号转邀请码
-   *
-   * @static
-   * @param {*} aiid
-   * @return {*}
-   * @memberof TICrypto
-   */
-  static aiid2regcode(aiid) {
-    const alphabet = 'e5fcdg3hqa4b1n0pij2rstuv67mwx89klyz'
-    const base = 16367
-    let num = (aiid + base) * (base - alphabet.length)
-    let code = ''
-    let mod
-    while (num > 0) {
-      mod = num % alphabet.length
-      num = (num - mod) / alphabet.length
-      code = code + alphabet[mod] // 倒序存放
-    }
-    return code
-  }
-
-  /**
-   * 邀请码转用户编号
-   *
-   * @static
-   * @param {*} code
-   * @return {*}
-   * @memberof TICrypto
-   */
-  static regcode2aiid(code) {
-    if (typeof code === 'string' && /^[a-zA-Z0-9]+$/.test(code)) {
-      const alphabet = 'e5fcdg3hqa4b1n0pij2rstuv67mwx89klyz'
-      const base = 16367
-      code = code.toLowerCase()
-      let len = code.length
-      let num = 0
-      for (let i = 0; i < len; i++) {
-        num += alphabet.indexOf(code[i]) * Math.pow(alphabet.length, i)
-      }
-      let aiid = num / (base - alphabet.length) - base
-      if (aiid >= 0 && Number.isInteger(aiid)) {
-        // 允许 aiid===0：当第一个用户（aiid==1）登录时，需要一个系统默认的邀请码。
-        return aiid
-      }
-    }
-    return null // null 代表一切非法的regcode
-  }
-
   /**
    * 压缩公钥
    *