Crypt30a is now Unicode capable

Click to launch the Crypt30a program This program requires you to know how to copy and paste text. CTRL-C copy, CTRL-V paste, CTRL-A select all. It is a fun little program intended for you to be able to play spy games and send secret messages to each other. It is based on secret key encryption which means you have to securely share a password with a friend and then you both use the same password to encrypt or decrypt text that you will paste into an email message.

The program requires you to have JavaScript enabled and that you have Java 1.5 or newer installed on your computer. This program runs in your web page browser and runs entirely on your computer. Once the program is loaded in your browser you could disconnect from the Internet and it will still function. You will want to select your correct language for the interface before disconnecting from the Internet as separate files are used to implement the different languages for the interface.

Before you start using the Javacrypt website (or leave because of information overload) here is some advice that may help you get the most use from the site. You will see a simple menu on the left edge of the screen. You can expand the menu by clicking the + next to to the word "Features". From this menu are handy links that allow you to list all the web pages (Wiki) all the web logs (blogs) and all the articles available for example. If you register and log in there will be additional articles and features available. When an article has more content available to read there will be a "Read More" link that you can click to read the rest of the article.

Javacrypt.com started in the mid to late 1990s when Robert Taylor's encryption projects using Javascript matured into full blown Java programs. The programs varied from Java dialogs (windows) launched from applets to embedded applets which provided access via scripts to the encryption features.

Use Case(s)

1. The application owner wants a solution where the user's password is not sent over the wire in plain text.
2. It is also desired to avoid the common weaknesses to session security.
3. The owner wants to be able to run more than one application from his domain and have session isolation.
4. There is a requirement that more than one user can be logged in at a time from the same workstation.
5. There is limited (if any) access to an HTTPS (encrypted session) server.

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Table of Contents (click + to expand)

[+]

1. Introduction
   [+]
   • The Idea
   • Requirements
   • Sample project
   • Source Files
2. Setup
   [+]
   • SystemComponent.php
   • case1_sqlcreate.sql
3. General Overview
   [+]
   • Login Activity Diagram
   • DbConnector.php
   • Validator.php
   • md5.js
   • hidden.php
   • newsessionkey.php
   • AuthenticateClass.php
   • index.html
   • login.php
   • failedlogins_page.php
   • sessions_page.php
   • users_page.php
4. Frames
   [+]
   • index.html
5. hidden.php
   [+]
   • addValidation (parentid,uri)
   • getSessionKey()
   • navigateTo(url)
   • logIn(parentid,uri)
   • logOut(parentid,uri)
   • addPleaseWait(parentid,uri)
   • XMLHttpRequest
   • getText (node)
   • createNewDocument ()
   • invokeSync (url, xmlDoc)
   • validateUserName(usern)
6. Common Page Code
7. Page Specifics
   [+]
   • login.php
   • Other Pages
8. newsessionkey.php
   [+]
   • Cookie
   • $HTTP_RAW_POST_DATA
   • Header
   • Response XML
   • Validation
   • mysql_real_escape_string
   • enabled
9. AuthenticateClass.php
   [+]
   • login failures
   • Session entry
   • Authentication key
   • $errors
10. Summary
    [+]
    • What's Next?

BPEL Call_Script

Here is a simple BPEL (Business Process Execution Language) with inline Java designed to permit calling a shell script or command right from a BPEL. The script will execute as the user the BPEL server or SOA (Service Oriented Architecture) server is running as. This project was built using Oracle JDeveloper BPEL Desinger and deployed to Oracle SOA suite.

File Archive and Cleanup using Perl

Here is a script that I developed to manage the archiving and eventual clean up of files in a directory. The script is designed to be run on a schedule. There are variables in the script that allow you to determine the number of days old a file has to be to be archived and the number of days old an archive has to be to be deleted. These can also be passed on the command line.
http://www.javacrypt.com/tiki-download_file.php?fileId=22

Mail Error Messages in Perl

I have uploaded a file that demonstrates my favorite way to send an error message via email when a Perl script encounters an error. The idea is that scripts which are scheduled via cron need to be able to communicate with you when they encounter errors. Here is a link to the example script.
http://www.javacrypt.com/tiki-download_file.php?fileId=21

CUPS - Common Unix Printing System - My Perl Scripts and Batch Projects

Scripts to import and export printers from CUPS. Scripts to automatically replicate printers from one server to another or to several others. Examples of automating printer management with scripts.

One of the things facing a Linux Application server administrator is how to manage printing.
http://www.cups.org/doc-1.1/sam.html
...

Perl One Instance

Ensuring that only one instance of a script is executing at a time is a common problem. One solution is to use
a file lock on the script itself as a running status flag. When the script terminates normally or is killed the system will
remove any file locks from the file. Here is an example I created using this idea:
http://www.javacrypt.com/tiki-download_file.php?fileId=4

Installing a Perl module when you are not root

You learn about installing Perl modules and using CPAN (Comprehensive Perl Archive Network) and the CPAN module in
our Installing Perl Modules article. But what happens when you have a certain module you would like to use in your scripts and you don't have root access? We will provide a recap of some of the suggestions we have found in this article.