From 1465e80091c4f12b6933b8bca081f2539105bc6a Mon Sep 17 00:00:00 2001
From: Hatter Jiang <jht5945@gmail.com>
Date: Tue, 26 Sep 2023 00:51:01 +0800
Subject: [PATCH] feat: update readme, add encrypt/decrypt by smart
 card(yubikey)

---
 README.md | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/README.md b/README.md
index d420ca6..96fdf0b 100644
--- a/README.md
+++ b/README.md
@@ -42,3 +42,26 @@ Encrypt config `~/.tinyencrypt/config-rs.json`:
   }
 }
 ```
+
+Smart Card(Yubikey) protected ECDH Encryption description:
+```text
+┌───────────────────┐                     ┌───────────────────────────┐
+│Tiny Encrypt       │                     │Smart Card (Yubikey)       │
+│                   │  Get Public Key(P)  │                           │
+│                   │ ◄───────────────────┤ Private Key d             │
+│                   │                     │ P = kG                    │
+│                   │ Temp Private Key k  │                           │
+└───────────────────┘ G = kG              └───────────────────────────┘
+
+                      Shared Secret = kP = kdG
+
+                      Store Q, Encrypt using derived key from Shared Secret
+
+
+                      Send Q to Smart Card
+                      ─────────────────►
+                                          Shared Secret = kQ = kdG
+
+                               Decrypt using derived key from restored Shared Secret
+```
+