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Special Forums Cybersecurity UNIX files timestamping - Need experts opinion as testimonial Post 302896141 by Perderabo on Friday 4th of April 2014 03:00:51 PM
Old 04-04-2014
Understand that many different Unix filesystems exist. We don't know which one you are using. But in general...

"Since all files (File1 to File20) are supposed to have been present in the same directory (DIR) is it possible to succeed in identifying access and deletion timestamp of only a subset?"

Yes it it quite possible. Deleting a file frees an inode. The inode continues to have some useful info in it... until it happens to be re-used.


"Also File1 to File14 are assumed to be created and deleted earliest than File15 to File20 (fwe month to several years for some files)"

I don't know why you assume that. Files can be deleted wheneve the owner wants. No need to delete in the sequence they were created. Even if you have some rule in place and follow it closely... perhaps the bad guy who broke in did not follow your rule.


If you want to verify your experts opinions, hire a second set of experts to examine the same system. Do not tell the second set what the first set said.
 

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EXTUNDELETE(1)						      General Commands Manual						    EXTUNDELETE(1)

NAME
extundelete - utility to undelete files from an ext3 or ext4 partition. SYNOPSIS
extundelete [options] device-file... DESCRIPTION
extundelete is a utility that can recover deleted files from an ext3 or ext4 partition extundelete uses the information stored in the partition's journal to attempt to recover a file that has been deleted from the partition. There is no guarantee that any particular file will be able to be undeleted, so always try to have a good backup system in place, or at least put one in place after recovering your files! OPTIONS
--version Prints the version number of extundelete. --help Print a brief usage summary for extundelete. Partition name Name of the partition that has deleted files, such as /dev/sda3. Could also be the file name of a copy of the partition, such as that made with dd. --superblock Prints information about the filesystem from the superblock. --journal --superblock Prints information about the journal from the journal's superblock. --inode # Prints the information from the inode number of the filesystem given, such as "--inode 2". --block # Prints the contents of the block, called as "--block 9652". --restore-file path/to/deleted/file Attempts to restore the file which was deleted at the given filename, called as "--restore-file dirname/filename". --restore-inode # Used to restore inodes by number, called as "--restore-inode 2569". Also accepts a list of inodes separated by only commas, such as "--restore-inode 2569,5692,6925". --restore-files filename Restores a list of files. First, construct a list of files in the same style as would be used in the --restore-file option, and save it to the file "filename". Then, this option may be used to attempt to restore those files with a single call to extundelete. This form also reduces redundancy from multiple calls parsing the journal multiple times. --output-dir path/to/dump/recovered/files Restores files in the output dir 'path'. By default the restored files are created under current directory 'RECOVERED_FILES' --restore-all Restores all files possible to undelete to their names before deletion, when possible. Other files are restored to a filename like "file.NNNN". --restore-directory path/of/directory Restores all files possible to link to specified directory to their names before deletion, when possible. -j journal_dev Specifies the device that is the external journal of the file system. -b block_number Specifies the block number of the backup superblock to be used when opening the file system. -B block_size Specifies the block size of the partition to be used when opening the file system. --before date Only restore files deleted before the date specified, which should be in the form of the number of seconds since the UNIX epoch. Use a shell command like $ date -d "Aug 1 9:02" +%s to convert a human-readable date to the proper format. The conversion from the number of seconds to a readable format may be found by using either of the following: $ date -d@1234567890 $ perl -le "print scalar localtime 1234567890" --after date Only restore files deleted after the date specified, which should be in the form of the number of seconds since the UNIX epoch. See the notes for the --before option for more information. AUTHOR
extundelete was written by Nic Case <number9652@users.sourceforge.net> Copyright (C) 2009, 2010 This manual page was written by Elias Alejandro Ano Mendoza <ealmdz@gmail.com>, for the Debian project (and may be used by others). September 29, 2010 EXTUNDELETE(1)
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