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Title:DI Management Home Page
Description:DI Management Home Page
Keywords:Australia, database design, computer consultant, custom software, databases, cryptography code, free software, cryptographic, Blowfish, MD5, SHA-1, SHA-2, SHA-3, CRC-32, RSA, XML-DSIG, Access, Microsoft Access, Visual Basic, ANSI C, C++, SQL server, MSDE, programming, software solutions, programmers, public key infrastructure, PKI, business systems analysis, business management consultant, systems design, business process reengineering, david ireland, accounting system, invoicing, inventory, billing, purchase orders, fixed asset, accounting, web site development, design
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DI Management Home Page
| Sitemap
DI Management Home
Home Page
DI Management Services is a computer programming consultancy based in Australia
and run by David Ireland.
This is our home page. There is a Site Map listing things more concisely
and more info on the site here.
To contact us follow the contact links below.
What we do
Earlier visits
We do three things:
Cryptography programming
Database design
General computer programming
What's new?
20 July 2013. Released
FirmaSAT-for-MAC
for the MAC-OSX platform and
FirmaSAT-for-Linux
for linux-i386 platforms.
12 May 2013. Brand new bdcalc calculator for the large natural numbers used in cryptography calculations.
27 April 2013. New version 2.4 of our free ANSI C BigDigits library
to do arithmetic and number theoretical calculations with large integers.
25 April 2013. Statistics: An on-line calculator for the binomial distribution.
22 March 2013. Updated the Converting from lex yacc to flex bison page and added
Using flex and bison in MSVC++ .
4 March 2013. Number theory: Updated the Dirichlet character table generator
15 February 2013. Cryptography: Encrypting credit card numbers using Feistel Finite Set Encryption Mode (FFSEM)
29 January 2013. Updated version 3.9.3 of the CryptoSys PKI Toolkit released.
15 January 2013. Statistics: An on-line calculator for the chi-square distribution.
6 December 2012. New version 1.5.2 of Wclock released.
19 November 2012. Set theory: De Morgan's laws explained in graphical form.
7 November 2012. New version 4.6 of CryptoSys API released, with SHA-3.
2 November 2012. Cryptography: Test vectors for HMAC-SHA-3.
22 October 2012. Cryptography: Test vectors for SHA-1, SHA-2 and SHA-3
including Kaccak
the new winner of the SHA-3 competition.
25 September 2012. Upgrade 5.1.2a of FirmaSAT released.
1 June 2012. Linear algebra: The theory behind Transforming a matrix to reduced row echelon form.
15 May 2012. Linear algebra: Added matrix calculator
Transform matrix to row canonical form
also called reduced row echelon form (RREF).
9 May 2012. Cryptography: Signing an XML document using XMLDSIG (Part 2).
18 November 2011. Coding Theory: Added matrix calculator
Transforming a generator matrix to standard form.
17 November 2011. Number theory: Updated the Euclidean Algorithm page
with code showing how to use the binary GCD algorithm.
11-11-11. New version 2.3 of our BigDigits free source code
and a new version of our Modular Arithmetic Freeware to do modular arithmetic calculations with large integers.
3 November 2011. Number theory: Complete re-write of RSA Theory page
and a new mathematics page on Elementary Number Theory.
August 2011. We have moved from Sydney to south-west Western Australia.
Cryptography programming
We maintain a detailed cryptography software page with useful free cryptographic software code
and various articles on cryptography.
The free code includes the Blowfish algorithm in VB6 and
the MySecret command-line freeware encryption utility.
The articles include
our page on the RSA Algorithm including the
Theory and proof of the RSA algorithm,
and various how-to pages such as
Using Keys in Cryptography,
Using Padding in Encryption,
Encryption with International Character Sets (re-written 2010-08-28), and
Cross-Platform Encryption.
We also publish cryptography-related articles on Mathematics.
...more details rarr;
CryptoSys Products
We sell two commercial cryptographic products under the CryptoSysTM brand name:
CryptoSys API and the
CryptoSys PKI Toolkit.
CryptoSys API is library of symmetrical cryptography tools
and the CryptoSys PKI Toolkit provides
public key encryption and digital signatures.
FirmaSAT
is a separate product to create and read digital receipts specifically
for the Tax Administration Service in Mexico (SAT).
There are interfaces for programmers in
VB6/VBA, VB.NET/VB2005/VB2008, C/C++, C# and (for CryptoSys API) ActiveX/COM/VBScript.
...more details rarr;
Consulting
We can provide consulting services on implementing cryptography in your programs.
In particular, we are happy to provide detailed programming help with implementing
CryptoSys API and the
CryptoSys PKI Toolkit.
...more details rarr;
Database design
We have been providing database solutions to small and medium enterprises for many years.
We use our extensive library of Microsoft Access techniques as a base to provide customised solutions that actually work.
We don't sell "off-the-shelf" database solutions. All our projects are customised individually for clients with specific problems.
...more details rarr;
To find out more about recent projects we have carried out see Projects.
There are some how-to pages on Using class modules in Access that we put together a few years ago
for Access 97 - it's still valid for all the more recent versions of Access.
We also describe our experiences in Upgrading from Access 97 to 2003.
Although a bit dated now, we show how to use SQL Server on Win98, and a simple graphical
OSQL Interface to MSDE from an Access database.
Our links page has some useful info on Microsoft Access and VB Programming.
General computer programming
Just need someone to cut some code?
Our founder David Ireland, GSSP-C, has many years experience in programming in a variety of languages,
including C, Visual Basic, Microsoft Access, C# and Perl.
Why use professional programming services?
For more details of our experience see
Profile,
Projects and
Computer Experience.
We enjoy doing complex algorithms and arcane problems.
If we can't do it, we'll tell you up-front, so as not to waste your time.
We only start jobs we know we can finish.
...more details rarr;
See our page on the C Programming Language
where we've assembled links and copies of interesting or educational articles on C programming,
look at Windows Win32 programming, and consider why we still prefer ANSI C to C++.
Examples
Wclock is a free, customisable, always-on-top world time clock for Win32 computers. The full source code is provided.
BigDigits is a free library of multiple-precision arithmetic routines written in ANSI C to carry out large natural number calculations.
DBXanalyzerTM
reads, analyses and manages email data files created by Microsoft Outlook Express 5 and 6.
It has a simple GUI interface and is used by hundreds of happy users worldwide to recover and manage their old Outlook Express emails.
You can download a trial version.
Our Su Doku Solver was written in Excel VBA back in 2004 when the "fiendish" puzzles were
first introduced by the Times.
This solver will solve almost all Su Doku problems (and takes away all the fun!).
Contact
Contact: Email Us
Client Login
Payments
This page last updated 23 July 2013
Home
Site Map
About Us
Projects
Links
Cryptography
CryptoSys API
CryptoSys PKI
FirmaSAT
RSA algorithm
C program'g
BigDigits
Mathematics
DBXanalyzer
Wclock
Su Doku
Contact
Email Us
Copyright copy; 2000-13 DI Management Services Pty Limited
ABN 78 083 210 584
Australia.
www.di-mgt.com.au.
All rights reserved.
Home |
Sitemap |
Services |
About Us |
Projects |
Links |
Cryptography |
CryptoSys API |
CryptoSys PKI |
DBXanalyzer |
BigDigits |
Mathematics |
Wclock |
Su Doku |
About This Site |
Terms |
Contact |
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