Added old posts

Signed-off-by: Ettore <noettore@gmail.com>

content/blog/gauth-backup.md

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+date = "2017-06-12T11:44:46+02:00"
+title = "How to: backup google authenticator app two-factor secrets"
+
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+
+Quick and dirty:
+
+- Connect your device to the PC via USB
+- Enable debugging mode
+- From the terminal:
+
+```bash
+adb root
+adb pull /data/data/com.google.android.apps.authenticator2/databases/databases
+sqlite3 ./databases "select * from accounts" > ./gauth_backup.txt
+```
+
+If you want to generate an auth code from  a TOTP secret you can use `oathtool`:
+
+```bash
+oathtool --base32 --totp "<secret>"
+```
+
+Enjoy!
+
+---
+
+Pro tip: to generate all the QR codes from the `sqlite` database you could use this python script (which requires the `qrcode` module):
+
+```py
+import qrcode
+import sqlite3
+conn = sqlite3.connect('databases')
+c = conn.cursor()
+
+for idx, (email, secret, issuer) in enumerate(c.execute("SELECT email,secret,issuer FROM accounts").fetchall()):
+    url = 'otpauth://totp/{}?secret={}&issuer={}'.format(email, secret, issuer)
+    print url
+    im = qrcode.make(url)
+    im.save('{}.png'.format(idx))
+```
+
+(source: [thouis](https://github.com/thouis))