GuaExcel

This is an utility to:

• decrypt any Excel 97/2000 files with password for opening and
• decrypt Excel XP/2002/2003 files in default (40-bit) encryption mode.

Do not use it for:

• decryption of Excel files versions prior to 97 (8.0)
• French Excel (any version)
• files using new Office XP encrypion (standard or non-standard CSP) up to 128-bit key
• finding read-only, workbook and other passwords. In this case look at the other page to find necessary utility.

This is a command-line utility for Win32 and Linux (DOS version can still also be obtained).

Please note this program will not recover your password, but it can remove any-length, any-language password from your document. Why? Because is not usual password recovery software.

Usual MS Office password recovery programs are testing passwords (using brute-force or dictionary attacks) to find the right one. This method is good only for short and non-complex passwords. For example, the fastest program gives about 1.000.000 password/second on Pentium 4/2000. To find 8-character password consisting of lowercase Latin letters and digits you'll need about 70 days. What if password is longer or consists of special characters or national symbols?

(Un)fortunately, another method to decrypt files exists. Excel 97/2000 (as well as Excel XP/2003 in default mode) password protection uses strong enough encryption algorithm, but because of U.S. crypto export regulations key length is only 40 bits. So, you need to test only 2⁴⁰ keys (not passwords) to decrypt your file with guarantee. GuaExcel does it, and key testing will take about 14 days on the same Pentium 4/2000 PC. Within this time (and in average within the half of this time) ANY file, encrypted with ANY password (no matter what length of the password is or what language or symbols used, etc) can be decrypted.

Moreover, GuaExcel offers distributed computing mechanism (via the shared directory) and you should divide the necessary time to the quantity of PCs you've got.

If you've got neither time nor powerful computers you may prefer Guaranteed Decryption Service that can decrypt your file very fast.

Advantages of GuaExcel are:

• 100% guarantee of decryption regardless of password used
• Very high rate (optimized for Celeron/Pentium II/III/4/AMD/ Core 2 architecture)
• Support of distributed cracking on the network as well as dual/dual-core/SMP computers
• Portability (Windows and Linux versions are available)
• Confidentiality (you crack your secret files, not someone from cracking service)
• Search for file-independent key, allowing to instantly decrypt files with the same password
• Decryption of file with known password (very useful for Office files recovery programs that don't support encrypted files)

• DEMO. The version demonstrates major GuaExcel features, but can process file with fixed password 'nyxo' only. It's FREE

Commercial versions include:

• 1 client version. It contains full key searching and decryption functionality, but only on one computer. Best for individual users, lowest price €/$29! (Please note it may take a long time, run demo version to estimate it)
  Now 2-clients version for the owners of dual, dual-core and Prescott HyperThreading processors for the price of 1-client!
• 5 clients (max) version has the special mechanism and the key searching is automatically distributing over several computers of your network. Price is €/$42.95, using 5 computers you'll decrypt any Excel file in average in 1 day! If you've got more computers, you may prefer
• 10 clients (max) version for €/$59.

All these version are licensed for non-commercial purposes only. If you wish to use GuaExcel to make any profit you should use

• unlimited, most powerful version with no limitations. It costs €/$150, but you can decrypt your file in minutes! (if you've got enough computers).

Version	File- dependent key searching and decryption of THIS file	File- independent key searching and decryption of ANY file with the same password	Distributed mechanism	Licence	Average time to decrypt (on Core 2 Duo E6300, two cores)	Price
Demo	YES (only fixed password)	YES (only fixed password)	NO (only 1 computer)	Freely distributable	-	FREE
1 client / 2 clients	YES	YES	NO	Non - commercial	4 days	€/$29
5-clients	YES	YES	YES,5 clients max.	Non - commercial	1 day (on 5 clients)	€/$42.95
10-clients	YES	YES	YES, 10 clients max.	Non - commercial	few hours	€/$59
Unlimited	YES	YES	YES, any number of clients	Any purposes (except distribution)	Depends of number of clients	€/$150

GuaExcel v. 1.6 DEMO for Win32 (80K)
GuaExcel v. 1.5 DEMO for Linux (ELF, static, 250K)
Download and estimate the decryption time on your computer!

Order the commercial versions over the Internet worldwide using secure connection. This means no one can intercept your confidential information. (Please note I also don't have an access to this information because card will be charged by ordering services listed below). The temporarily link to the fully functional version you recieve immediately after verifying your order. Normally you'll get the program within 10-15 minutes.

Most questions and answers you'll find in the GuaExcel FAQ.

Only legal customers are supported. No claims and question about freeware version will be accepted, but I'll appreciate the constructive feedback. Also contact me if you have any problems with ordering the program.

Please send any comments and bugs to software@password-crackers.com In case of the bug reported I'll update program as soon as possible.

You may submit your opinion/read other opinions here.

1.6:

• 25% speed-up on Core 2 chips. The theoretical value of 1500 ticks per password has been beat.
• /s option is available in all versions

1.5:

• 25-35% speed-up on Pentium 4 and AMD, a little bit on Pentium III. /f option is now obsolete.
• Kernel crypto function for any processor now can be easily added and the best rate functions are choosen automatically.
• Interruption by Ctrl+C bug on multiprocessor and P4 HyperThreading computers fixed.
• 2-clients version instead of 1-client (for the same price) to use the power of dual/dual-core processors.

1.3:

• Full Win32 console application (DOS version still may be obtained)
• Pentium 4 optimization
• More accurate estimated time calculation

1.22:

• Bug in parsing of write-protected files fixed
• File corruption test added

1.2: (versions 1.0, 1.1 skipped to remain compatibility with current GuaWord version):

• First client now can be considered as "server". The decryption is performed on this client only. New /1 option. (Network versions)
• New /p option to decrypt files with known password.
• Linux version available.

0.9:

• First (BETA) version released.

Last updated: