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+# OSTP Client - Linux x64 CLI
+
+Universal Linux VPN client with TUN interface support (statically linked with musl).
+
+## 📦 Contents
+
+- **ostp-client-linux** (2.0 MB) - CLI VPN client with profile management
+- **SHA256SUMS** - Integrity verification checksum
+- **client.json.example** - Configuration file template
+
+## 🚀 Quick Start
+
+### 1. Verify Integrity
+
+```bash
+sha256sum -c SHA256SUMS
+```
+
+### 2. Install
+
+```bash
+chmod +x ostp-client-linux
+sudo cp ostp-client-linux /usr/local/bin/
+```
+
+### 3. Setup Profile (Interactive)
+
+```bash
+ostp-client-linux setup
+```
+
+The wizard will prompt for:
+- **Server address** (e.g., `vpn.example.com:443`)
+- **Pre-shared key** (64 hex characters - get from admin)
+- **Country code** for SNI mimicry (US, RU, DE, NO, CN, etc.)
+- **Profile name** (e.g., "US-West", "RU-Moscow")
+
+### 4. Connect
+
+```bash
+# Using saved profile
+sudo ostp-client-linux connect --profile default
+
+# Or with explicit parameters
+sudo ostp-client-linux connect \
+  --server 1.2.3.4:443 \
+  --psk YOUR_64_CHAR_HEX_PSK \
+  --country US
+```
+
+### 5. Check Status
+
+```bash
+ostp-client-linux status
+```
+
+Output:
+```
+🌍 VPN Connection Status
+
+   Status: Connected
+   Interface:  ostp0
+   RX Bytes:   123 MB
+   TX Bytes:   456 MB
+   RX Packets: 98765
+   TX Packets: 54321
+```
+
+### 6. Disconnect
+
+```bash
+sudo ostp-client-linux disconnect
+```
+
+## 🛠️ Commands
+
+### Connection Management
+
+```bash
+# Connect with profile
+sudo ostp-client-linux connect --profile <name>
+
+# Connect with parameters
+sudo ostp-client-linux connect \
+  --server <ip:port> \
+  --psk <hex_key> \
+  --country <code>
+
+# Run in background (daemon mode)
+sudo ostp-client-linux connect --profile default --daemon
+
+# Disconnect
+sudo ostp-client-linux disconnect
+
+# Show status
+ostp-client-linux status
+```
+
+### Profile Management
+
+```bash
+# List all profiles
+ostp-client-linux profiles list
+
+# Add new profile
+ostp-client-linux profiles add \
+  --name "US-West" \
+  --server 1.2.3.4:443 \
+  --psk YOUR_PSK \
+  --country US
+
+# Remove profile
+ostp-client-linux profiles remove "US-West"
+
+# Set default profile
+ostp-client-linux profiles set-default "US-West"
+```
+
+### Testing
+
+```bash
+# Test connection (handshake only, no tunnel)
+ostp-client-linux test \
+  --server 1.2.3.4:443 \
+  --psk YOUR_PSK
+```
+
+## 📂 Configuration
+
+### Profile Storage
+
+Profiles are stored at: `~/.config/ostp/profiles.json`
+
+```json
+{
+  "profiles": [
+    {
+      "name": "US-West",
+      "server": "1.2.3.4:443",
+      "psk": "64_character_hex_key",
+      "country": "US"
+    },
+    {
+      "name": "RU-Moscow",
+      "server": "5.6.7.8:443",
+      "psk": "another_64_char_hex_key",
+      "country": "RU"
+    }
+  ],
+  "default_profile": "US-West"
+}
+```
+
+### Manual Configuration
+
+You can also edit `client.json` for advanced settings:
+
+```json
+{
+  "server": "vpn.example.com:443",
+  "psk": "your_64_character_hex_psk_key",
+  "country": "US",
+  "auto_connect": false,
+  "kill_switch": true,
+  "dns_servers": ["1.1.1.1", "8.8.8.8"]
+}
+```
+
+## 🔐 Security Features
+
+### Stealth Mode
+- **TLS 1.3 Mimicry** - Looks like HTTPS traffic to DPI systems
+- **Geo-specific SNI** - Uses country-appropriate domains (cloudflare.com, google.com, etc.)
+- **UDP-over-TCP Framing** - Random padding to avoid pattern detection
+- **No Protocol Signatures** - Unidentifiable traffic
+
+### Anti-Analysis (Production Build)
+- **VM Detection** - Refuses to run in analysis sandboxes
+- **Debugger Detection** - Exits if debugger attached
+- **Tool Detection** - Checks for IDA, Ghidra, GDB, strace, etc.
+- **Weighted Scoring** - Smart heuristics to avoid false positives on VPS
+
+### Encryption
+- **AEAD Cipher**: ChaCha20-Poly1305
+- **Key Exchange**: X25519 ECDH
+- **PSK Validation**: HMAC-SHA256 with silent drop
+
+## 🌐 Network Configuration
+
+After successful connection:
+- **Interface**: `ostp0` (TUN device)
+- **Client IP**: Assigned by Master Node (10.X.Y.Z/16)
+- **Gateway**: Master Node (10.X.0.1)
+- **DNS**: Configurable (default: 1.1.1.1, 8.8.8.8)
+- **MTU**: 1420 (optimized for tunneling)
+
+## 🖥️ System Requirements
+
+- **OS**: Any Linux distribution (kernel 3.10+)
+- **Architecture**: x86_64 (AMD64)
+- **RAM**: 64 MB minimum
+- **Privileges**: Root required for TUN interface
+- **Dependencies**: None (static binary with musl)
+
+## 🔧 Troubleshooting
+
+### Permission Denied
+
+```bash
+# Solution: Run with sudo
+sudo ostp-client-linux connect --profile default
+```
+
+### No TUN Interface
+
+```bash
+# Check if TUN module is loaded
+lsmod | grep tun
+
+# Load TUN module
+sudo modprobe tun
+
+# Make persistent (add to /etc/modules)
+echo "tun" | sudo tee -a /etc/modules
+```
+
+### Connection Fails
+
+```bash
+# Test handshake only
+ostp-client-linux test --server 1.2.3.4:443 --psk YOUR_PSK
+
+# Check if server is reachable
+ping 1.2.3.4
+telnet 1.2.3.4 443
+
+# Check logs (if running in daemon mode)
+sudo journalctl -f | grep ostp
+```
+
+### Profile Not Found
+
+```bash
+# List available profiles
+ostp-client-linux profiles list
+
+# Create new profile
+ostp-client-linux setup
+```
+
+### DNS Not Working
+
+```bash
+# Check DNS configuration
+cat /etc/resolv.conf
+
+# Manually set DNS
+echo "nameserver 1.1.1.1" | sudo tee /etc/resolv.conf
+
+# Or use systemd-resolved
+sudo systemctl restart systemd-resolved
+```
+
+## 📊 Performance Tips
+
+### Optimize MTU
+
+```bash
+# Find optimal MTU
+ping -M do -s 1472 1.1.1.1
+
+# Set custom MTU (after connection)
+sudo ip link set ostp0 mtu 1400
+```
+
+### Background Mode
+
+```bash
+# Run in background
+sudo ostp-client-linux connect --profile default --daemon
+
+# Check if running
+ostp-client-linux status
+```
+
+### Kill Switch (TODO)
+
+Automatically block all traffic when VPN disconnects:
+
+```bash
+# Configure in client.json
+"kill_switch": true
+```
+
+## 🔄 Updates
+
+Check for updates:
+```bash
+ostp-client-linux --version
+```
+
+Download latest release from:
+- GitHub: https://github.com/ospab/ospab.network/releases
+- Gitea: http://localhost:4000/ospab/ospab.network/releases
+
+## 📚 Advanced Usage
+
+### Multiple Profiles
+
+```bash
+# Add multiple profiles for different regions
+ostp-client-linux profiles add --name US --server us.vpn.com:443 --psk KEY1 --country US
+ostp-client-linux profiles add --name RU --server ru.vpn.com:443 --psk KEY2 --country RU
+ostp-client-linux profiles add --name DE --server de.vpn.com:443 --psk KEY3 --country DE
+
+# Switch between profiles
+sudo ostp-client-linux disconnect
+sudo ostp-client-linux connect --profile RU
+```
+
+### Scripting
+
+```bash
+#!/bin/bash
+# Auto-connect script
+
+if ! ostp-client-linux status | grep -q "Connected"; then
+    echo "Connecting to VPN..."
+    sudo ostp-client-linux connect --profile default --daemon
+    sleep 3
+    
+    if ostp-client-linux status | grep -q "Connected"; then
+        echo "✓ Connected successfully"
+    else
+        echo "✗ Connection failed"
+        exit 1
+    fi
+fi
+```
+
+### Systemd Service
+
+Create `/etc/systemd/system/ostp-client.service`:
+
+```ini
+[Unit]
+Description=OSTP VPN Client
+After=network.target
+
+[Service]
+Type=simple
+User=root
+ExecStart=/usr/local/bin/ostp-client-linux connect --profile default
+Restart=on-failure
+RestartSec=10s
+
+[Install]
+WantedBy=multi-user.target
+```
+
+Enable and start:
+```bash
+sudo systemctl daemon-reload
+sudo systemctl enable ostp-client
+sudo systemctl start ostp-client
+```
+
+## ⚠️ Important Notes
+
+- **Root Required**: TUN interface creation requires root privileges
+- **PSK Security**: Never share your PSK publicly or commit to git
+- **Production Mode**: Anti-analysis checks only run in release builds
+- **Single Instance**: Only one client can run at a time
+- **Network Changes**: Route tables are modified during connection
+
+## 🆘 Support
+
+For issues and questions:
+- **GitHub Issues**: https://github.com/ospab/ospab.network/issues
+- **Documentation**: See project README.md
+- **Email**: support@ospab.network
+
+## 📝 Version History
+
+- **0.1.0** (January 2, 2026)
+  - Initial release
+  - Profile management system
+  - TLS mimicry with geo-SNI
+  - Anti-VM/debugger detection
+  - Interactive setup wizard
+
+---
+
+**Version:** 0.1.0  
+**Build Date:** January 2, 2026  
+**License:** Proprietary  
+**Copyright:** © 2026 Ospab Network
diff --git a/dist/ostp-client-linux/SHA256SUMS b/dist/ostp-client-linux/SHA256SUMS
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+++ b/dist/ostp-client-linux/SHA256SUMS
@@ -0,0 +1 @@
+cf3996eac77ed62d184452b3032e3bffc60c120e77cee57899a33893322b0cc4  ostp-client-linux
diff --git a/dist/ostp-client-linux/client.json.example b/dist/ostp-client-linux/client.json.example
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@@ -0,0 +1,12 @@
+{
+  "server": "vpn.example.com:443",
+  "psk": "YOUR_64_CHARACTER_HEX_PSK_KEY_FROM_ADMIN_HERE_CHANGE_THIS",
+  "country": "US",
+  "auto_connect": false,
+  "kill_switch": false,
+  "dns_servers": [
+    "1.1.1.1",
+    "8.8.8.8"
+  ],
+  "log_level": "info"
+}
diff --git a/dist/ostp-client-linux/ostp-client-linux b/dist/ostp-client-linux/ostp-client-linux
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