表面是计算器，暗藏安全通讯
A calculator on the surface, a secure messenger underneath.
Zero server storage · Screenshot-proof · Read and burn
暗算从底层设计为安全而生——不只是加密，而是从根本上消除泄密的每一种可能性。
Built for security from the ground up — not just encryption, but eliminating every possibility of leakage.
App 图标和首屏是完全真实的计算器，支持加减乘除。只有输入正确密码才能进入聊天。
A fully functional calculator on the surface. Enter the secret code to access the chat. Disguise Entry / Password Gate消息仅显示占位符，手指按住才逐行揭示内容。松手后消息在双方设备同步彻底删除。
Messages show as placeholders. Hold to reveal line by line. Release — gone forever on both devices. Hold-to-Reveal / Release-to-DestroyAndroid 系统级 FLAG_SECURE 保护，截屏显示黑屏。iOS 实时检测并触发紧急销毁。
FLAG_SECURE on Android blocks screenshots entirely. iOS detects and destroys on capture. FLAG_SECURE / CapturedDidChange基于 Signal Protocol，每条消息独立密钥。前向安全 + 可否认加密，服务端被攻破也无法解密。
Signal Protocol with per-message keys. Forward secrecy ensures past messages stay safe even if keys leak. Signal Protocol / X3DH / Double Ratchet消息通过 WebRTC 点对点传输，不经过任何服务器。离线消息加密暂存后即删。
WebRTC Data Channel for direct P2P transfer. Offline messages encrypted, then deleted on delivery. WebRTC P2P / Zero-Server Storage对方阅读后松手的瞬间，消息在双方设备同时消失。没有倒计时，没有截图机会。
The moment the reader releases their finger, the message vanishes from both devices instantly. Synchronized Destruction / Instant Burn暗算的每一步都经过精心设计，确保从入口到出口的全链路安全。
Every step is engineered to ensure end-to-end security from launch to destruction.
打开 App 显示为计算器，支持真实运算。输入预设密码后平滑进入安全聊天界面。
The app appears as a real calculator. Enter your secret passcode to unlock the chat.WebRTC 点对点直连，Signal Protocol 加密。消息不经过任何服务器，直达对方设备。
Direct P2P connection via WebRTC. Signal Protocol encryption. Zero server involvement.消息到达仅显示占位符。手指按屏逐行揭示真实内容，松手即恢复遮罩。
Messages appear as masked placeholders. Touch and slide to reveal content row by row.松开手指，0.1 秒内双方设备同时删除消息。服务器无记录，无法恢复。
Release your finger — gone in 0.1 seconds from both devices. No trace, no recovery.暗算在核心安全特性上实现了前所未有的组合——对比所有主流安全通讯产品，没有第二家能同时做到。
DarkCalc achieves a combination of security features unmatched by any mainstream secure messaging app.
| 功能特性 Features | 暗算 DarkCalc | Signal | Telegram Secret | Confide | 蝙蝠 Bat Chat |
|---|---|---|---|---|---|
| 防截屏 Screenshot Protection | ✅ 完美 Full | ⚠ Partial | ⚠ Partial | ✅ Strong | ⚠ Notify |
| 按住显示 Hold to Reveal | ✅ | ❌ | ❌ | ✅ | ❌ |
| 松手即焚 Release to Destroy | ✅ Synced | ❌ | ⚠ Timer | ✅ | ⚠ Timer |
| 计算器伪装 Calculator Disguise | ✅ | ❌ | ❌ | ❌ | ❌ |
| 服务器不留存 Zero Server Storage | ✅ P2P | ❌ Server | ⚠ E2EE Store | ⚠ Temp | ❌ Server |
| 端到端加密 E2E Encryption | ✅ Signal | ✅ | ✅ | ✅ | ✅ |
| 截屏后即时销毁 Destroy on Screenshot | ✅ | ❌ | ❌ | ⚠ Notify | ⚠ Notify |
从军事国防到商业机密，从法律职业到个人隐私——当安全成为必需，暗算就是答案。
From military defense to corporate secrets, legal privilege to personal privacy — when security is non-negotiable, DarkCalc delivers.
军事通信需要绝对安全保障。防截屏、阅后即焚、无服务器存储满足最严格的保密通信标准。
Absolute security for classified communications. Meets the strictest confidentiality standards.核心技术资料、商业机密、投融资信息——通过普通聊天工具传输风险极高。暗算提供安全通道。
Protect trade secrets, IP, and sensitive deal communications from leaks and interception.并购谈判、客户信息、协议审定。需要确认即销毁的安全环境，避免信息泄露导致的商业风险。
M&A talks, client data, contract reviews — secure communication that leaves no trace.客户律师保密特权需要技术保障。确保敏感沟通不被第三方获取，不留记录。
Safeguard attorney-client privilege with technology that ensures no third-party access.新闻调查中的敏感信息来源保护。匿名通信和自毁机制为记者和线人提供双重安全保障。
Protect sources and sensitive investigative communications with anonymity and self-destruct.私人对话不留痕迹。表面是计算器，别人看不出任何端倪——真正意义上的隐私保护。
Private conversations with no digital footprint. A calculator disguise keeps your secrets safe.保护你的每一句话。下载暗算，体验军用级安全即时通讯。
Protect every word. Download DarkCalc and experience military-grade secure messaging.
