Category Archives: file system

How to make Raspberry Pi OS fileysystem truly read-only (SHA512 checksum of SD card after rebooting is identical)

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I followed this guide and, in theory, the filesystem is read-only.
$ cat /boot/cmdline.txt
console=serial0,115200 console=tty1 root=PARTUUID=5838cc20-02 rootfstype=ext4 elevator=deadline rootwait fbcon=map:10 fbcon=font:VGA8x8 fastboot fsc… Continue reading How to make Raspberry Pi OS fileysystem truly read-only (SHA512 checksum of SD card after rebooting is identical)→

What config files and logs files of a Linux system (CentOS 7) deserve to be monitored by a SIEM?

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I am not a security expert (I am more a software developer) and I am working on a project related to a SIEM installation (Wazuh). This installation is only a demo for a customer, in a second time a real scenario project will be implemented… Continue reading What config files and logs files of a Linux system (CentOS 7) deserve to be monitored by a SIEM?→

Question regarding data encryption/decryption and sharing said keys with third party’s

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At work we have a pretty complex problem(for me at least) and I have no idea what a fitting solution would be. To give a bit of context, the company I work for is a data processor/provider for big corporations that need sensitive user data… Continue reading Question regarding data encryption/decryption and sharing said keys with third party’s→

How metadata of file is preserved when copying from computer to pen drive and pen drive to a different computer

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With this question, I understand time stamps of a file (for example, ‘modification date’) are not stored in the file, but saved in the file system(NTFS for example), most probably in MFT records.
If this is the case, how the timestamps are… Continue reading How metadata of file is preserved when copying from computer to pen drive and pen drive to a different computer→

Understanding where ‘creation time’, ‘accessed time’ , ‘modified time’, etc are saved in a file in Windows

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This is part of my job and spent over a week understanding the timestamps.
I could open a file in hex editor. But I cannot understand where the timestamps are stored.
Request anyone to help me, I am totally stuck in understanding it.

… Continue reading Understanding where ‘creation time’, ‘accessed time’ , ‘modified time’, etc are saved in a file in Windows→