{"id":4280,"date":"2011-10-16T16:52:31","date_gmt":"2011-10-16T20:52:31","guid":{"rendered":"http:\/\/g33kinfo.com\/info\/?p=4280"},"modified":"2011-10-16T16:52:31","modified_gmt":"2011-10-16T20:52:31","slug":"secure-delete","status":"publish","type":"post","link":"https:\/\/g33kinfo.com\/info\/secure-delete\/","title":{"rendered":"Secure-Delete"},"content":{"rendered":"

From ubuntugeek.com<\/a><\/p>\n

The Secure-Delete tools are a particularly useful set of programs that use advanced techniques to permanently delete files. To install the Secure-Delete tools in Ubuntu, run the following command<\/p>\n

sudo aptitude install secure-delete<\/code><\/p>\n

The Secure-Delete package comes with the following commands<\/p>\n

srm(Secure remove) – used for deleting files or directories currently on your hard disk.
\n smem(Secure memory wiper) – used to wipe traces of data from your computer\u2019s memory (RAM).
\n sfill(Secure free space wiper) – used to wipe all traces of data from the free space on your disk.
\n sswap(Secure swap wiper) – used to wipe all traces of data from your swap partition.
\n srm – Secure remove<\/p>\n

srm removes each specified file by overwriting, renaming, and truncat-ing it before unlinking. This prevents other people from undeleting or recovering any information about the file from the command line.<\/p>\n

srm, like every program that uses the getopt function to parse its arguments, lets you use the — option to indicate that all arguments are non-options. To remove a file called \u2018-f\u2019 in the current directory, you could type either \u201csrm — -f\u201d or \u201csrm .\/-f\u201d.<\/p>\n

srm Syntax<\/strong><\/p>\n

srm [OPTION]\u2026 FILE\u2026<\/p>\n

Available Options<\/p>\n

-d, –directory – ignored (for compatibility with rm)
\n-f, –force – ignore nonexistent files, never prompt
\n-i, –interactive – prompt before any removal
\n-r, -R, –recursive – remove the contents of directories recursively
\n-s, –simple – only overwrite with a single pass of random data
\n-m, –medium – overwrite the file with 7 US DoD compliant passes (0xF6,0\u00d700,0xFF,random,0\u00d700,0xFF,random)
\n-z, –zero – after overwriting, zero blocks used by file
\n-n, –nounlink – overwrite file, but do not rename or unlink it
\n-v, –verbose – explain what is being done
\n–help display this help and exit
\n–version – output version information and exit<\/p>\n

srm Examples<\/strong><\/p>\n

Delete a file using srm<\/p>\n

srm myfile.txt<\/code><\/p>\n

Delete a directory using srm<\/p>\n

srm -r myfiles<\/code><\/p>\n

smem – Secure memory wiper<\/strong><\/p>\n

smem is designed to delete data which may lie still in your memory (RAM) in a secure manner which can not be recovered by thiefs, law enforcement or other threats. Note that with the new SDRAMs, data will not wither away but will be kept static – it is easy to extract the necessary information! The wipe algorythm is based on the paper \u201cSecure Deletion of Data from Magnetic and Solid-State Memory\u201d presented at the 6th Usenix Security Symposium by Peter Gutmann, one of the leading civilian cryptographers.<\/p>\n

smem Syntax<\/p>\n

smem [-f] [-l] [-l] [-v]<\/p>\n

Available Options<\/p>\n

-f – fast (and insecure mode): no \/dev\/urandom.
\n-l – lessens the security. Only two passes are written: the first with 0\u00d700 and a final random one.
\n-l -l for a second time lessons the security even more: only one pass with 0\u00d700 is written.
\n-v – verbose mode<\/p>\n

sfill – secure free space wipe<\/strong><\/p>\n

sfill is designed to delete data which lies on available diskspace on mediums in a secure manner which can not be recovered by thiefs, law enforcement or other threats. The wipe algorythm is based on the paper \u201cSecure Deletion of Data from Magnetic and Solid-State Memory\u201d presented at the 6th Usenix Security Symposium by Peter Gutmann, one of the leading civilian cryptographers.<\/p>\n

sfill Syntax<\/p>\n

sfill [-f] [-i] [-I] [-l] [-l] [-v] [-z] directory\/mountpoint<\/p>\n

Available Option<\/p>\n

-f – fast (and insecure mode): no \/dev\/urandom, no synchronize mode.
\n-i – wipe only free inode space, not free disk space
\n-I -wipe only free disk space, not free inode space
\n-l -lessens the security. Only two passes are written: one mode with 0xff and a final mode with random values.
\n-l -l for a second time lessons the security even more: only one random pass is written.
\n-v – verbose mode
\n-z – wipes the last write with zeros instead of random data<\/p>\n

directory\/mountpoint this is the location of the file created in your filesystem. It should lie on the partition you want to write.<\/p>\n

sswap – Secure swap wiper<\/strong><\/p>\n

sswap is designed to delete data which may lie still on your swapspace in a secure manner which can not be recovered by thiefs, law enforce?ment or other threats.The wipe algorythm is based on the paper \u201cSecure Deletion of Data from Magnetic and Solid-State Memory\u201d pre?sented at the 6th Usenix Security Symposium by Peter Gutmann, one of the leading civilian cryptographers.<\/p>\n

sswap Syntax<\/p>\n

sswap [-f] [-l] [-l] [-v] [-z] swapdevice<\/p>\n

Available Option<\/p>\n

-f – fast (and insecure mode): no \/dev\/urandom, no synchronize mode.
\n-l – lessens the security. Only two passes are written: one mode with 0xff and a final mode with random values.
\n-l -l for a second time lessons the security even more: only one pass with random values is written.
\n-v – verbose mode
\n-z – wipes the last write with zeros instead of random data<\/p>\n

sswap Examples<\/p>\n

Before you start using sswap you must disable your swap partition.You can determine your mounted swap devices using the following command<\/p>\n

cat \/proc\/swaps <\/code><\/p>\n

Disable swap using the following command<\/p>\n

sudo swapoff \/dev\/sda3<\/code><\/p>\n

\/dev\/sda3 – This is my swap device<\/p>\n

Once your swap device is disabled, you can wipe it with sswipe using the following command<\/p>\n

sudo sswap \/dev\/sda3<\/code><\/p>\n

After completing the above command you need to re-enable swap using the following command<\/p>\n

sudo swapon \/dev\/sda3<\/code><\/p>\n

From ubuntugeek.com<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

From ubuntugeek.com The Secure-Delete tools are a particularly useful set of programs that use advanced techniques to permanently delete files. To install the Secure-Delete tools in Ubuntu, run the following command sudo aptitude install secure-delete The Secure-Delete package comes with the following commands srm(Secure remove) – used for deleting files or directories currently on your… <\/p>\n

Read More<\/i><\/a><\/div>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,16],"tags":[],"class_list":["post-4280","post","type-post","status-publish","format-standard","hentry","category-linux-apps","category-ubuntu"],"yoast_head":"\nSecure-Delete - Linux Shtuff<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/g33kinfo.com\/info\/secure-delete\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Secure-Delete - Linux Shtuff\" \/>\n<meta property=\"og:description\" content=\"From ubuntugeek.com The Secure-Delete tools are a particularly useful set of programs that use advanced techniques to permanently delete files. To install the Secure-Delete tools in Ubuntu, run the following command sudo aptitude install secure-delete The Secure-Delete package comes with the following commands srm(Secure remove) – used for deleting files or directories currently on your... 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