Author Archives: AllExJ

Why is my TPM bugged? If I enable checks on PCR 8,9,10, it ALWAYS asks for decryption password even if it shouldn’t [migrated]

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I’ve also checked with systemd-analyze pcrs if PCRs are the same at every reboot, and they are.
Only at first reboot I don’t know why the only PCRs that change are 8,9,10 lol(I don’t know why)… but in next reboots they are always the sam… Continue reading Why is my TPM bugged? If I enable checks on PCR 8,9,10, it ALWAYS asks for decryption password even if it shouldn’t [migrated]→

Why the TPM PCRs does not consider a UEFI settings change? If someone resets CMOS, it’s undetected

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In my laptop I’ve set up a bios password when I power on the laptop, and once I enter it the laptop starts my linux distro and decrypts the disk without asking any other password. To do this I’ve set up TPM to automatically decrypts the di… Continue reading Why the TPM PCRs does not consider a UEFI settings change? If someone resets CMOS, it’s undetected→

Why in "openssl pkeyutl -verify" is needed both public and private keys? Why isn’t public key enough?

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I created a signature with:
openssl pkeyutl -sign -inkey rsa.key.bob -in plain -out plain.sig.bob

and to verify, Alice just needs to use Bob public key to check the authenticity of the message.
So why I have to use this (which require th… Continue reading Why in "openssl pkeyutl -verify" is needed both public and private keys? Why isn’t public key enough?→

DNS Spoofing attack works in host machine but does not work in guest VM machine. I’m curious about why

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I am practicing in these attacks and countermeasures.
I did attack against a computer and it works. I did it against a bridged-network guest VM machine and it does not work. I’m curious about why.
As you can see I receive multiple response… Continue reading DNS Spoofing attack works in host machine but does not work in guest VM machine. I’m curious about why→