Older blog entries for jackshck (starting at number 14)

Excel Encryption

Well I have been doing some research, and I have found that Adobe Acrobat encrypts its files almost exactly like M$ Excel/Word do.

Details of Adobes algorithm can be found here (PDF File) in section 5.18(page 62) and section 6.13 (page 124)

I will be contacting Adobe, and asking them if I can post the info on my website.

Chicago roadmap update

I just updated the Chicago roadmap. I listed some milestones and what I want to do with each milestone. I will add more stuff later.

Chicago Site Update

I just updated the Chicago web site.

I added the following:

  • A link to some misc docs on BIFF 8
  • Some more links on the xlhtml page.

I will be adding a binary for Linux to the binary list soon.

It's official. I am now the maintainer of the xlhtml project. It's new homepage can be found at http://chicago.sf.net/xlhtml. I invite everyone to download the code and bang away on it.

12 Mar 2002 (updated 12 Mar 2002 at 19:30 UTC) »
xlhtml web-site update

I just updated the xlhtml web site. I added links to the batch converter script, and the XLS viewer. The batch converter script, takes all the xls files in a directory and converts them to HTML. The xls viewer is a gui frontend for xlhtml.

xlhtml takeover

It looks like I am going to complete taking over the xlhtml project today. I have created a basic web page here. Currently it is the only site on the net about xlhtml, as the main site is down.

Web Site Update

  I just updated the Chicago web site. I changed some links and the structure a little bit. It should be easier to follow now.

Another Web Site Update

I updated the Chicago Developer page over the weekend. I added some links to MS docs on the file Excel file format.

Chicago Web Site Update

  I just updated the Chicago project developer web page. I added links to 3 projects (1 TCL 2 PHP) that can write the Excel file format.
  I also cleaned up the documentation list. I will be adding links to more documentation in a little bit.

1 Mar 2002 (updated 1 Mar 2002 at 18:34 UTC) »
Excel Encryption

  Well it looks like I may get some help in figuring out the Excel Encryption Algorithm. I received an e-mail from someone at a company called Arizan, looking for information on the Algorithm.
  I checked out Arizan's web site, and found they provide a way to read and interact with popular file formats on your PDA, including MS Word/Excel/PPT.
  I assume they want info on the algorithm so they can add the ability to open password protected Excel files if the password is supplied.
  I will cooperate with them, and ask that any information they discover be turned over to the Open Source community.
  I hope that with a company investing some time in this, more information on the algorithm can be uncovered.

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