# SSH Key Investigation - Quick Reference

**For**: @mouy-leng  
**Date**: 2026-02-18  
**Status**: ⚠️ Action Required

## The SSH Key You Asked About

```
ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBLjxGzOnZXj7/4tvo0PkaMFMYVzr+0lK2ZruE0FH4upnCFo//O140zhutN61/4qiDGD+ESsKTsUJil0q9o72dXQ=
```

## Investigation Results

✅ **This key is NOT in the repository code**  
✅ **This key is NOT in the git history**  
✅ **This key is NOT in any configuration files**

## Where to Check Next

### 1. GitHub Deploy Keys (Most Likely Location)
This is probably a deploy key for automated deployments.

**How to check**:
1. Go to: https://github.com/A6-9V/MQL5-Google-Onedrive/settings/keys
2. Look for a key starting with "ecdsa-sha2-nistp256"
3. Check the title/description to see what it's used for

**If you find it**:
- Note what it's labeled as
- Check if it has write access
- Decide if you still need it

### 2. Your Personal GitHub SSH Keys
Check your personal SSH keys.

**How to check**:
1. Go to: https://github.com/settings/keys
2. Look through your SSH keys
3. See if this ECDSA key is listed

**If you find it**:
- Consider replacing it with Ed25519 (more secure)
- See "Migration Steps" below

### 3. GitHub Actions Secrets
The private key might be stored as a secret.

**How to check**:
1. Go to: https://github.com/A6-9V/MQL5-Google-Onedrive/settings/secrets/actions
2. Look for secrets like:
   - `SSH_PRIVATE_KEY`
   - `DEPLOY_KEY`
   - `PAGES_DEPLOY_KEY`

**If you find it**:
- Check which workflows use it
- Determine if it's still needed

### 4. VPS/Server (If You Have One)
Check if it's authorized on any servers.

**How to check**:
```bash
# SSH into your VPS
ssh user@your-vps-ip

# Check authorized keys
cat ~/.ssh/authorized_keys | grep "nistp256"
```

**If you find it**:
- Remove it if no longer needed:
  ```bash
  # Edit the file and delete the line with the key
  nano ~/.ssh/authorized_keys
  ```

## What This Repository Currently Uses

The repository is already configured with a **more secure Ed25519 key**:

```
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEeSLWKibLOYIOA794iClIT7WU/32N1BbfzHR8hopSGG jules@google.com
```

See [SSH Setup Documentation](../SSH_SETUP.md) for details.

## Recommendations

### If You Find the Key and Still Need It:
1. Consider migrating to Ed25519 (more secure)
2. Document its purpose in `SSH_SETUP.md`
3. Store it in your password manager

### If You Don't Need It Anymore:
1. Remove it from GitHub (deploy keys or personal keys)
2. Remove it from any VPS authorized_keys
3. Remove it from GitHub Actions secrets
4. No further action needed

### If You Can't Find It:
- It may have already been removed
- No action needed

## Migration to Ed25519 (Recommended)

If you want to replace this ECDSA key with a more secure Ed25519 key:

```bash
# 1. Generate new Ed25519 key
ssh-keygen -t ed25519 -C "mouy-leng@example.com" -f ~/.ssh/id_ed25519_mouy

# 2. Display the public key
cat ~/.ssh/id_ed25519_mouy.pub

# 3. Add to GitHub
# Copy the output and add it at: https://github.com/settings/keys

# 4. Test the connection
ssh -T git@github.com

# 5. Remove the old ECDSA key from GitHub
```

## Need Help?

See the full investigation report:
- [SSH Key Audit Report](SSH_KEY_AUDIT.md)
- [SSH Setup Documentation](../SSH_SETUP.md)

## Summary

**What we found**: The SSH key is NOT in the repository  
**What you need to do**: Check GitHub settings (deploy keys and personal keys)  
**Why it matters**: Security best practice is to remove unused keys  
**Recommendation**: Migrate to Ed25519 if still needed

---

**Created by**: GitHub Copilot Agent  
**Full Report**: See `docs/SSH_KEY_AUDIT.md`