---
title: "How an authenticator generates a login code"
url: "https://reamcp.dev/zh-tw/cases/how-an-authenticator-generates-a-login-code-f530d2"
source: "https://rea.tools/showcase/aegis"
source_type: "website"
author: "REA team"
author_handle: "REA team"
stars: 0
category: "CTF 與學習"
categories: ["ctf-learning"]
tags: []
added: "2026-10-13T03:57:24.397Z"
updated: "2026-10-13T03:57:24.399Z"
locale: "zh-tw"
content_locale: "zh-tw"
---

# How an authenticator generates a login code

從開源驗證器 Aegis 已發佈的 APK 追出六位數驗證碼的計算方式，並用示範時鐘說明為何每 30 秒換一次。

## Original README

Inspect the Aegis Android APK with REA, recover its six-digit login-code calculation and try a reconstruction with an adjustable clock.