The mechanics of BIOS password locks present in current generation laptops are briefly outlined. Trivial mechanisms have been put in place by most vendors to bypass such passwords, rendering the protection void. A set of master password generators and hands-on instructions are given to disable BIOS passwords.
When a laptop is locked with password, a checksum of that password is stored to a so-called FlashROM - this is a chip on the mainboard of the device which also contains the BIOS code and other settings, e.g. memory timings.
For most brands, this checksum is displayed after entering an invalid password for the third time:
When a laptop is locked with password, a checksum of that password is stored to a so-called FlashROM - this is a chip on the mainboard of the device which also contains the BIOS code and other settings, e.g. memory timings.
For most brands, this checksum is displayed after entering an invalid password for the third time:
| Vendor | Hash Encoding | Example of Hash Code/Serial | Scripts |
|---|---|---|---|
| Compaq | 5 decimal digits | 12345 | pwgen-5dec.py Windows binary |
| Dell | serial number | 1234567-595B 1234567-D35B 1234567-2A7B | Windows binary&source |
| Fujitsu-Siemens | 5 decimal digits | 12345 | pwgen-5dec.py Windows binary |
| Fujitsu-Siemens | 8 hexadecimal digits | DEADBEEF | pwgen-fsi-hex.py Windows binary |
| Fujitsu-Siemens | 5x4 hexadecimal digits | AAAA-BBBB-CCCC-DEAD-BEEF | pwgen-fsi-hex.py Windows binary |
| Fujitsu-Siemens | 5x4 decimal digits | 1234-4321-1234-4321-1234 | pwgen-fsi-5x4dec.py Windows binary |
| Hewlett-Packard | 5 decimal digits | 12345 | pwgen-5dec.py Windows binary |
| Hewlett-Packard/Compaq Netbooks | 10 characters | CNU1234ABC | pwgen-hpmini.py Windows binary |
| Insyde H20 (generic) | 8 decimal digits | 03133610 | pwgen-insyde.py Windows binary |
| Phoenix (generic) | 5 decimal digits | 12345 | pwgen-5dec.py Windows binary |
| Sony | 7 digit serial number | 1234567 | pwgen-sony-serial.py Windows binary |
| Samsung | 12 hexadecimal digits | 07088120410C0000 | pwgen-samsung.py Windows binary |
You can get full article from here http://dogber1.blogspot.in/2009/05/table-of-reverse-engineered-bios.html
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