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Blog2021-01-06T11:35:08-05:00

Implementing Two-Factor Authentication

Two-​factor authentication using the time-​based one-​time password algorithm can be easily implemented with PHP on any web server. This standardized method is widely used as an additional security measure for logins and uses smartphone apps, e.g. the Google or Microsoft Authenticator, as a second factor.

September 11, 2020|Browser, HTML5, PHP, Web Design|

Augmented Reality with Chrome: Let Flowers Grow!

With Chrome 81 Beta for Android, it’s now possible to use immersive Augmented Reality in the browser. I have again created two variations of the original demo source code to show what is easily possible. You can now walk around the earth, having a closer look, and (hopefully) spread joy by placing flowers wherever you like.

February 15, 2020|AR, Augmented Reality, Chrome, HTML5|

A minimal Web Push example

Web push notifications allow users to opt-​in to asynchronous messages from a server to a web application. The message can be sent at any time, even when the web application or the web browser is inactive. This W3C standard, based on the HTTP/2 protocol, is now supported by Chrome, Firefox, Edge, Opera, and Safari – but not by iOS.

February 8, 2020|Browser, Cloud, JavaScript, Progressive Web App, PWA, Web Design|

An Alexa skill for New York City transport service changes

Playing around with the idea of Alexa Skills based on live data feeds, I created an Alexa Skill which announces unplanned service changes of the New York City subway and bus lines, based on information provided by the Metropolitan Transportation Authority (MTA). This skill, available in English and German, was now certified and has gone live.

January 21, 2020|Alexa Skill, Amazon Echo, AWS, Node.js, TypeScript, Voice Assistant|

Why not to abbreviate the year 2020

The year 2020 poses a special problem that can make it easy for scammers to forge handwritten documents. This happens once in a century, the last time in the year 1919. It’s common practice to shorten the year when writing down a date. This year, however, could cause some legal issues and can leave you at risk of fraud.

January 14, 2020|Legal|
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