How to sign a document without access to printer/scanner?

Sometimes, agencies ask us to sign documents, take the scan and then upload/mail the scanned copy of the signed document. This is definitely better than nail mail but still a bit cumbersome. This will need access to copier (carrying document) or printer (scanned copy is available) or both. In case you do not have these at home and office is clingy about usage, option is to visit a cafe or some such other places.

With smartphones, adobe reader and access to a clean white sheet, you can save these efforts. Read on to know how.

Step 1. Take scan of the document if not already done. On Android phones, use either ‘Microsoft office lens‘ or ‘camscanner‘. Transfer these scanned documents to a cloud storage drive for long term usage or mail to yourself. Upload in PDF format from camscanner.

Step 2. Take a small piece of white paper and sign on it by pen. Take scan of this also and upload on cloud or mail yourself. Upload in JPG format from camscanner.

Step 3. Open scanned document in Adobe Reader and open signature pan. Choose option to sign using image and insert the scanned signature. Done.

Additionally, if you have access to a touch screen laptop, a bit rare case with business laptops, you can directly sign on scanned copy using touch screen and stylus, again a rare thing.

I have done the same while uploading documents to EPFO and they accepted all, so its workable solution. Adobe has done nice work with this feature whereas it puts signature as transparency rather than as white background image. You can even change the size of the signature image.


Strengthening WiFi router security for home network 

My WiFi network got hacked as well as of my neighbors. I had trouble getting reliable network in other parts of house because many unknown devices kept connecting to my network. Same is true with neighbors.

Look at devices names

  • android-d30a64368136fc1 14:1A:A3:8A:8B:4A MOTOROLA MOBILITY LLC, A LENOVO COMPANY
  • android-c84b9e4c6410d964 34:BB:26:08:00:7d Motorola Mobility LLC, USA
  • android-4bda3cc13c03e41e F8:CF:C5:4D:71:58 MOTOROLA MOBILITY LLC, A LENOVO COMPANY
  • android-b2aa46d340f80770 F8:84:F2:D8:00:C2 Samsung Electronics Co.,Ltd, SOUTH KOREA

All these are weirdly named devices that were named as so to avoid being detected. Most probably, MAC addresses are also spoofed one.

I did some research on password crackers tools for WiFi and saw below links. All these claim to be legal but who stopped thieves from using AK 47?

It turns out that first level of attack is via WPS which is open by default on almost all home routers. Another problem factor is DHCP. We do not really need either of these if we can use technology in right way.

Another protection would be to hide broadcasting of SSID name of WiFi network. This will make it a bit difficult to do quick dictionary level attack on network. Most probably, hardware detection would be needed to scan all wifi signal in the vicinity to figure if an unknown WiFi is broadcasting.

Passphrase off course should be somewhere 30 to 40 characters long. 15 character alphanumeric is easy to break.

If living in apartment complex, one good idea would be to check neighbors to see if they are also hacked. Collecting hacker device names from them can help convince society to throw out unwanted elements, read data thieves, from building.

Additionally, MAC filtering can be enabled although it seems that it is very easy to spoof MAC addresses even on mobiles.

Some tools that are useful in detecting hacked WiFi or getting to know if any unknown devices are on network are as follows

  • Fing Android App  This tells the list of devices connected on the WiFi whee the android mobile is connected.
  • Acrylic WiFi can be used to list out the characteristics of WiFis around us. This gives rating of network security and stuff like that. It also tells if WPS is enabled. Disable WPS if you see it enabled for your SSID and see that network safety rating goes up from 2 to 5.
  • WiFi Analyzer is a tool on Android to find out the strength of WiFi signal in graphical manner. If you see too much overlap from other routers. just reboot router once to get new interference free channel.