Design Simulation Systems Pty Ltd is an Australian company, which was originally born in Singapore, with the aim of developing most of the stuff described in these pages, until it was bought by the National Computer Board. This reincarnation is now a consultancy, largely devoted to development work centred around Unix based security applications, two of which are described below.
Occasionally, we undertake custom simulation model creation, for use on SPICE.
Authentication begins when your device connects to the IDaaS authentication server.
The device's unique signature is checked against those registered to you, and is
the second factor of the authentication - which also permits Single Sign-On to
This process is totally transparent, and there are no cookies or client software
on your device.
Your password data is protected by strong encryption, and the most effective encryption key management system you've ever seen.
Even the root user neither knows nor can access the encryption key, and even he can't access any user's password.
Unlike freebies like Radius, you can install it in 5 minutes, configure it using your smartphone and, unlike SAML-based systems, you can write an interface to it, with 2 lines of HTML.
If you already have a demo account on our IDaaS system, you can access it here
Totally hands-free registration of any device, without cookies or client software.
The signature is unique to your device, and provides the second factor of authentication. In fact, it's so unique, you can use it as your first factor, and omit the password.
Even though the data might all be encrypted, The Enemy Within knows the location of the encryption keys and can steal the database, decrypt the data, and publish it on the internet.
Not with our system. Once the keys are set, not even we can access them.
Our interest in security has been fostered by the fact that this site has been under attack by parasites trying to implant viruses since 2009, and by a botnet since Christmas Eve 2012.
We've collected and logged about 5000 hack queries, ranging from SQL injection, to dumb PHP and WordPress hacks, to attempted bash exploits.
Our IDS/IPS, has successfully defeated every single hack attempt and, by reporting the IP addresses to their ISP's, has helped to remove 67346 of these parasites from the internet - and counting...
If you're interested in trying the IPS, to protect your website, drop me a line.
We include here, a pot-pourri of Unix articles, with a leaning towards database and security applications. If you're not that good a programmer, they'll either help, or put you off, for good... Read 'Real Programmers' to see if you qualify or, if you're not a programmer, try 'WordImperfect'
In an era where an electronic circuit is a slab of silicon, designed by writing a language like VeriLog or VHDL, with virtually no need to understand the mathematics of circuit design, or the physics of semiconductor devices, we present a set of tools from a more gracious age. From an age when computers were still drawn by horses, and it took an engineer to design something. Not a software package.
I guess this is all precipitated by the fear that, one day, there will be nobody left who actually understands how or why stuff like VHDL works, and colleges will have stopped teaching mathematics, because it's all too hard, and too many people fail the courses - which isn't politically correct, because it damages their delicate egos....
So, what are these analog tools? I hear you ask...
At some point, you might like to see a complete electronic circuit design cycle, starting with schematic capture, proceeding to a time-domain simulation, and finishing with some DSP post-processing of the result, to produce a Fast Fourier Transform of the output waveform
These tools are all available for free download, compiled for either Linux or Sun SPARC. No special gizmos, like Motif or Java are needed, and they'll run quite happily on anything with a working X11 library.
Graphical Schematic Capture and Edit
Of course, circuit design is done with a graphical circuit editor, supported with libraries for everything. Behavioural level Laplace Transform primitives, high level logic functions, semiconductors, mechanical components, PCB track primitices and a heap of others.
When the simulation is finished, you can apply a whole heap of mathematical functions, including forward and inverse Fourier transforms, convolution, deconvolution, differentiation, integration functions and display results in the complex plane.
You can also download either the SPICE or Spice3 simulator (or both), each of which has functionality that the other doesn't have.
Not content with offering the analog circuit creation and simulation anachronism, we compound the injury by also showing a digital circuit simulator, which simulates digital logic at the device level, not the gate level.
You can set up any waveform you can think of with the signal generator, drive your circuit over whatever time interval, and with whatever resolution you choose, and watch the outputs change. This goes for a time domain analysis, a frequency domain sweep and everything else that SPICE can do. All results are presented graphically.
Since even the most comprehensive library may miss the very device which you need to use, we also supply a set of component modelling tools
Vmodel will make a computer model from the characteristics supplied on the data sheet, while Vmodel2 accepts X-Y characteristic curve data, and accurately extracts and optimizes the relevant SPICE parameters by curve-fitting techniques