Posts Tagged ‘security’

jsNoSpam – make it harder for bots to find your email address

March 6, 2016

If you want to put an email address on a web page, and have it human readable and easy to click on to open up in a mail client you run the risk of exposing yourself to one of the sleazier sides of the internet. Spam email. There are bots out there which relentlessly hunt down email addresses so their masters can deluge you with unsolicited commercial email (or worse, virus infections).

The best solution is to never show the email address – get your users to use a “Contact Us” form or similar so that there’s nothing for the bots to find. But sometimes you can’t do that, either because of how the pages are hosted or your client simply doesn’t want you to.

So… jsNoSpam was born. 100% javascript, so all client side and easy to insert anywhere that allows you to edit raw HTML and include javascript.

The script works by doing a number of things…

  • Requires you to encode the email addresses so they never appear in a recognizable form in the script or HTML source.
  • Supports decoding the email address back to a usable format
  • Allows you to display the de-coded address on the page, or to require a user action (mouse over, click, keyboard navigation etc) before revealing the address.

Because the email address which is inserted into the page via the script is clickable and usable like any regular mailto: link would be user inconvenience is reduced to a minimum, but the effort for a bot to scrape the address is increased and hopefully as there are enough potential variants in how the script can be applied it will keep it ahead of the game.

Here is a live demo of the code in action.

The code is hosted on GitHub, and is open source and unrestricted license (though it would be great if you find it useful if you comment here). It’s been tested in as many browsers as I can and also with assistive technologies (eg NVDA) but if you do find an issue please comment (or better yet fire off a pull request for me to incorporate your fix).

On their own, the techniques used (encoding the address, requiring user intervention etc) are not new, but hopefully combined they will produce a robust enough solution for people who need this workaround.

Security of individual accounts matters (but not to Starbucks)

June 22, 2015

There has been a lot written recently about major system compromises, where banks, Government departments, Healthcare, and other companies are targeted and huge collections of personal information get harvested. Often lasting for months before discovered these attacks reveal PII (Personally Identifiable Information) such as social security numbers, dates of birth, addresses, email addresses and, in too many cases, passwords.

Defending against these attacks is an on-going challenge, but storing information in a way that it can be harvested has a significant impact on users of the service – ranging from identity theft to direct financial loss.

But it is not just servers where the risks lie. Poor information security on the end user experiences compromise individual accounts and can be hard to detect, easy to overlook because of how it’s reported.

Starbucks original logoEarlier this year Starbucks was mentioned as a possible victim of one of these attacks as users accounts mysteriously were being accessed. To remedy this Starbucks rolled out an update to their iOS app and presumably their Android app. This may or may not have improved things for their website or for 3rd party apps running on other platforms. Most of their response appeared to have been PR and damage limitation rather than really beefing up security.

Recently I experienced one of these mysterious losses. While I was in Australia on business someone in Ontario Canada was apparently using my card. And thanks to the convenient auto-reload facility on my account the system kept merrily making more funds available to the thief.


Spam and security

March 5, 2013

With a series of high profile security breaches in recent weeks (Twitter, Evernote, LinkedIn and others) the obvious concern is that the attacker has access to your account. In some cases it’s more than that. (more…)

More TSA weirdness

February 27, 2013

As I travel a fair bit for work and pleasure I get to enjoy the TSA “Freedom Massage” and the rest of the theater on a fairly frequent basis. At the checkpoint I’ve seen fairly inconsistent behavior even at the same airport (and while there are some terrible jumped up lunchroom monitors wearing the uniform there are also some great folks manning the front line as well).

Not the main topic of this post, but as I’ve noted before I opt out for freedom. But when I do I also get to skip the metal detector. If I was really determined to get something sharp passed the pat down I’m sure I could find a way. (more…)

Building a safe and portable way to get online

May 19, 2011

Over the last few months I’ve had a couple of friends go through some rather unfortunate domestic situations which have involved partners spying on their computer activities, intercepting and even sending emails from what they thought was a private account. They’ve used a variety of means ranging from simply accessing a machine that’s not been locked through to using a keylogger or network sniffer to steal passwords and read email.

There are weaknesses with any operating system, especially if you do not have sole access to the machine or a way to secure the local area network to avoid eavesdroppers, so to try and solve the problem I looked at ways to eliminate the risks of both physical access and software spying.

The solution I came up with is a little technical, but works pretty well and provides a good balance of security and ease of use

The first part of the solution is unobtrusive USB Flash Drives. These can take many forms but for convenience I’ve been using LaCie USB Keys that look like keys. They come in various sizes (though I consider 8GB the minimum for what I’m doing) and are easy to hide in plain sight, and you’re not likely to misplace it if it’s with your house or car keys.

The second part of the solution is a stand-alone installation of Ubuntu. While it’s not as user friendly or as familiar as Windows or OSX for a lot of people its fairly simple to set up a totally self-contained installation that runs entirely from the USB Key – it leaves no trace on the host machine, it never starts the host machine (so software key-loggers and other spyware are useless) and it’s fairly light-weight so you can start up or shut down in less than 30 seconds.

Setting Ubuntu up in this way doesn’t follow the usual path to build a LiveCD that most people use to try out Linux – with that style of setup you can’t store data on the drive or perform in-place upgrades (patching the build, adding new drivers or even migrating to a new version)

The final part of the solution is installing anti-virus scanners that you can use to examine the host machine, and a VPN client to secure your communications with the outside world…

Preparing the Bootable Ubuntu key

These instructions do assume you have a clue what you’re doing, and that you can deal with the consequences of doing something wrong along the way. If you follow the recommendations you should be okay but, as with anything of this nature, there may be dragons ahead…

Safely selecting the right drive.

You may omit this step if after partitioning you choose to install grub to the root of the usb drive you are installing Ubuntu to, (ie sdb not sdb1). Unless you do this correctly though you can overwrite the HDD MBR which can be a pain to deal with so it’s not recommended. If you don’t know what grub is… proceed with caution!

·         Turn off and unplug the computer.

·         Remove the side from the case.

·         Unplug the power cable from the hard drive.

·         Plug the computer back in.

Installing Ubuntu

·         Insert the flash drive.

·         Insert the Live CD.

·         Start the computer, the CD should boot.

·         Select language

·         Select “Install Ubuntu”.

·         Select Download updates while installing and Select Install third-party software.
If you have an active network connection (wired recommended) this will save time later on.

·         Forward

·         At “Allocate drive space” select “Specify partitions manually (advanced)”.

·         Forward

·         Confirm Device is correct.

·         Click “free space” and then “Add”.

·         Select “Primary”, “New partition size …” = 4 to 6 GB, Beginning, Ext4, and Mount point = “/” then OK.

Optionally configure a Home partition

If you’re only planning to have a single user and primarily store data in desktop folders then this isn’t required.

·         Click “free space” and then “Add”.

·         Select “Primary”, “New partition size …” = 4 to 8 GB, Beginning, Ext2, and Mount point = “/home” then OK.

Optionally configure swap space

This allows hibernation but from experience with this configuration it’s quicker and easier to shut down and start than hibernate.

·         Click “free space” and then “Add”.

·         Select “Primary”, “New partition size …” = remaining space, (1 to 2 GB, same size as RAM), Beginning and “Use as” = “swap area” then OK.

Finish installation

·         Confirm “Device for boot loader installation” points to the USB drive. Default should be ok if HDD was unplugged.

·         Click “Install Now”.

·         Select your location.

·         Forward.

·         Select Keyboard layout.

·         Forward.

·         Insert your name, username, password, computer name and select if you want to log in automatically or require a password.

·         Select “Encrypt my home folder” for added security (especially if there is a risk of losing the drive)

·         Select forward.

·         Wait until install is complete.

·         Turn off computer and reconnect the HDD.

·         Reboot computer and select the flash drive to start

·         Log in and complete installation, upgrading packages and adding options like Chrome browser or Evolution email client

Securing your connection

While having a stand-alone machine image that allows you to keep local content secure you want to make sure no one is sniffing communications on wired or wireless networks. At the very least you need to ensure people are not stealing passwords so in Chrome you want  to install something like the KB SSL Enforcer which will try to redirect any connection to a secure channel to make snooping a lot harder.

If you want to ensure none of your online communications are overheard then you want to install and configure a Virtual Private Network (VPN) connection with someone like StrongVPN – this has the added advantage for some that you can even choose which country you want to appear to be surfing from 🙂

There are a number of Linux based anti-virus solutions (such as ClamAV) that can be used to scan the host machine but I’d recommend if you want to clean a Windows machine that you get a bootable version of Spybot S&D (that you can also run from a Flash Drive and keep up-to-date) as that’s a more robust solution.

Email and Documents

Depending on your situation you may want to keep as much as possible on the USB Key and as little as possible on the web, vice versa or somewhere in between. Personally I recommend setting up a new webmail (Hotmail or Gmail) account only once you are securely connected (so the password is never visible on an unsecured connection) and using Evolution to keep that in sync with the local drive so you can work either from the disk in off-line mode, or log in from a web browser in an internet café or somewhere away from prying eyes. For documents a service like Ubuntu One (probably a good bet as it’s integrated with the OS), DropBox or SkyDrive gives you the flexibility of working locally or “in the cloud”.

Given the risks of losing the drive, or corruption happening due to an overzealous or early removal I would strongly recommend keeping important data backed up somewhere secure and online just in case. You might want to consider installing Prey on the image just in case you lose it.

Stay safe out there!

A lot of the things you need to do to stay safe is common sense – don’t share logins, don’t re-use password and things like that but sometimes you need to bring more sophisticated tools and techniques to bear… I’d love to see some comments about how to improve this solution or make it simpler. If you like the idea of having this sort of setup but the instructions have put you off I’m happy to build a key for you for a reasonable fee (to cover time and expenses). Support for Ubuntu or any other applications mentioned here should come from the respective suppliers.


December 13, 2010

Following a recent scare about password security folks have been asking what they should do to keep their information safer on-line.

Well, the obvious this is not to use the same password for every site, but it’s really hard to think up and remember new passwords for each site.

A couple of quick and easy ideas are to pick a word you can remember (but not something easily identifiable with you) and add some letters from the site you are visiting to make it unique.

For instance if your chosen phrase is “cheese” and you are creating a password for Twitter you could take the first two consonants from the site name (tw) and combine them “twcheese”. You could make it more complex by adding a special character and adding mixed case “tw$Cheese” or substituting numbers for letters “tw$Chee5e”. In the same way your password for Facebook would become “fb#Chee5e” – easy to remember, because of your rule, but hard for someone else to guess. If you’re feeling like making it even harder you could take those two consonants and shift them on the keyboard… up a row or across a character so the password becomes “gn$Chee5e” (f becomes g, b becomes n. The p, l or m would wrap to q, a or z for instance)

Of course this still means remembering the passwords, and sometimes a site may have specific rules that break your usual pattern (minimum or maximum length, complexity, use of special characters etc) so it’s nice to have a tool to help with that…

I use KeePass to keep track of those passwords for me (both ones I create and also for some sites I get it to generate random ones for me). It’s especially handy because for a lot of sites I simply have to navigate to the site and hit the hot-key and it will auto-complete username and password fields for me, so I don’t have to leave any information in my browser. KeePass secures your password collection against a master password (so you only have to remember one thing) or uses a physical key (so as long as you keep them separate it’s very secure).

Because I use a couple of machines I also use the KeePassSync plugin which lets you sync between Amazon S3 storage or DigitalBucket (a free online file storage platform). The only thing I wish I could do is carry the passwords around on my phone and use Bluetooth pairing or a USB connection to make sure I always had them to hand.