![]() ![]() To my surprise he was able to find an outlying byte - 0xFF!Īfter running the measurements a few more times, we were quite sure that the timing was indeed different when the first byte of the key is 0xFF. However, I sent over the data (50 measurements per first byte, iterating over 256 values) to Redford. Just looking at the data directly didn't make me optimistic, as all the results were jittery at first glance. I quickly made the STM32 measure the time between the last bit of the code sent and the time until the busy line got deasserted again (which takes quite a bunch of cycles after the last ID byte received, hmm). So, before having to redesign the makeshift probe into something more useful, I figured it might be easier to try a simpler timing attack first. ![]() I at first tried power trace side-channel analysis attack (since I had a ChipWhisperer laying around gathering dust) when the bootloader checks the password, but my makeshift shunt probe was just too noisy. To unlock the flash, the programmer sends 12 bytes: a command prefix (0xF5), the address of the ID code (?, 0x0FFFDF), the length of the ID code (?! 7) and 7 bytes of ID code.Īfter the programmer sends the ID code check function, another command (0x70) can be used to check whether the ID code verification succeeded. The clock comes from the programmer, and the EC exposes a Busy line used to synchronize whether its' ready to receive commands. If the programmer does not provide the code, no flash dump/write access is allowed. This code is used by the built-in bootrom to allow/deny access to the flash via the 'Standard Serial I/O' protocol for programming (selectable via M0/M1 straps). The EC has a 7-byte ID code that it keeps in flash. And finally, I added an oscilloscope to the voltage shunt and a logic analyzer to serial lines, for good measure.Īfter checking connectivity to the bootrom and that I was getting power traces, it was time to dive in. I also attached a ChipWhisperer with a shunt sensor board to the EC's power line. I've then attached an STM32F303RE on a Nucleo board as a general interface board to the EC's serial and reset. I've etched a new board that lets me access important pins (serial TX, RX, CLK, BUSY RST and power lines) without having to fiddle with the previous hacky breakout board. Main Problem and Solution on Toshiba Laptop When Bios Password set: When you turn on your Toshiba, it will ask for the password, it will also display the Password=, then you will enter a key combination to make your toshiba laptop display a challenge code, we will use this challenge code to generate your toshiba response code, giving you the ability to unlock your toshiba laptop, removing the bios password.After another long hiatus, I've come back to this project. Your password plus instructions will be sent by email within 5 minutes or the most it takes is 2 hours, password will work 100% or your money back, in also request that you send a picture of the laptop displaying the code on screen for typo verification, send picture to email below.Ĭontact email is: Toshiba Laptop Models We can Reset: All Toshiba Laptop Displaying: Password= and Challenge Code plus Challenge Code and Toshiba Model Number below and hit buy now, Get your Laptop master password, full support and instructions. If you have a Toshiba Laptop, Showing: ( Password = ), Followed by the Challenge code, You can buy your password here, so enter Your Toshiba Serial No. In order for the password to work keep the Laptop turned on charging until password arrivesdo not enter wrong passwordswe do not want the challenge code to change. 4 ) If performed right you should see the challenge code displayed on screenjust like in image 2 1 ) Restart your Toshiba laptop pressing F2 Every second! 2 ) ( Password= ) will be displayed just like in image 1 above 3 ) Press keys in this order, , and. Learn how to make your Toshiba Laptop display the challenge code. ![]() It will also show the challenge code, after pressing some keys on your Laptop keyboard. If your Toshiba Laptop Displays: Password= get the response code from us, and unlock your Toshiba Laptop or Notebook in minutes image #1 Find here Master passwords to unlock Toshiba Laptop with PC Serial no. ![]()
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