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Emails with attachments

If an email has to transport not only text but additional data, this is located in an attachment to the email. But the alleged pictures or documents very often really are executable programs, intended to infect the system on which they are opened. Here you can check how this typically happnes without risking any damage.

Please read our notes on side effects of these test mails.

Content Security Policy halts XSS in its tracks

Cross-site scripting (XSS) is one of the biggest problems faced by webmasters. The new Content Security Policy standard should finally provide some relief more »
Skype's ominous link checking: Facts and speculation

Our associate's discovery that URLs sent through Skype are then visited by Microsoft has caused quite a stir. A little more information has now emerged and leads to even more questions more »
Password protection for everyone

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Two clicks for more privacy

"Like" buttons for Facebook, Google+ and Twitter present a privacy problem. A 2-click concept developed by heise online addresses this problem more »