1. Secure Deletion Of
Data On The Cloud
By : Bhanu Priya
Supervisor : Dr.Richard
Sinnott

2. Cloud Nectar

3. The Need For Secure
Deletion Of Data On The
Cloud
1) Used In Banks

4. Need For Secure Deletion
Of Data On The Cloud
3) Cloud Used In Business

5. Need For Secure Deletion
Of Data On The Cloud
Multiple Copies Of Data On The Cloud

6. Research Work :
• Test Various Linux Based Secure Deletion Of Data Tools
.Test the basic linux utilities like (rm , rmdir etc).
• Test whether data can be recovered using linux based data
recovery tools .
• Find the optimal solution for the use of secure deletion of
data tools
• If Data is Removed from a single machine , the copies of
that data should be removed from other virtual machines as
well.The aim is to achieve parallel synchronisation of all the
servers.

7. Secure Deletion Of Data
Tools Used
• Wipe wipe <filename>
• SRM sudo srm /path/to/file
• SHRED shred -u -z -n filename
• RM rm <filename>
• SMEM smem [-f][-l][-l][-v]
• SFILL sfill -f -v -ll /path/to/directory
• SSWAP cat /proc/swaps

8. Video Files :
Video File
Size
WIPE SHRED SRM RM RM -RF
1 kb 1 SEC 1 SEC 1 SEC I SEC 1 SEC
10kb 1 SEC 1 SEC 1 SEC 1 SEC 1 SEC
100kb 1 SEC 1 SEC 1 SEC 1 SEC 1 SEC
1Mb 1 MINUTE 1 SEC 2 SEC 1 SEC 1 SEC
100 Mb
3 MIN 53
S
1 MIN 5 MIN 1 SEC 1 SEC
1 Gb 1 HR 11 M 7 MIN 1 HR 10 M 1 SEC 1 SEC
10Gb 2 HR 45 M 1 HR 12 M > 3 HRS 1 SEC 1 SEC
10 Mb 2 MIN 1 MIN 1 MIN 1 SEC 1 SEC
280.4 Mb 13 MIN 2 MIN 18 MIN 1 SEC 1 SEC
base 64 /dev/urandom | head -c <byte> > <filename>

9. IMAGE FILES :
IMAGE FILE WIPE SHRED SRM
1 KB 1 SEC 1 SEC 1 SEC
10 KB 1 SEC 1 SEC 1 SEC
100 KB 1 SEC 1 SEC 1 SEC
1 MB 2 SEC 1 SEC 2 SEC
10 MB 13 SEC 2 SEC 1 MIN
100 MB 4 MIN 1 MIN 6 MIN
1 GB 53 MIN 7 MIN 1 HR 20 MIN
10 GB 2 HR 45 MIN 1 HR 12 MIN > 3 HOURS

10. TEXT FILES :
TEXT FILES WIPE SHRED SRM
1 KB 1 SEC 1 SEC 1 SEC
10KB 1 SEC 1 SEC 1 SEC
100 KB 1 SEC 1 SEC 1 SEC
1 MB 2 SEC 1 SEC 3 SEC
10 MB 13 SEC 3 SEC 39 SEC
100 MB 5 MIN 1 MIN 7 MIN
1 GB 54 MIN 9 MIN 1 HR 21 M

11. SMEM (Secure Memory)
• An Open source Tool To see , the users and the
processors that are using the physical memory.
• It has three options.view the system wide memory
usage , view the memory usage by each user,to view
the memory usage by mapping .

13. smem -w

14. smem -u

15. sswap:
cat /proc/swaps

16. SFIL
L
• One Of The Secure-Delete Tools.
• It searches for free space in the specified
partition and fills it up with some data to
avoid recovery of data from the free space
.
• syntax : sudo sfill /home.

17. photorec :
1) Choose the partition to recover from

18. Photorec:
2) choose the file system to recover from

19. PhotoRec:
3) Select the type of file you want to recover

20. Photorec:
4) Select the file system again

21. Photorec :
ect whether you want to recover the free space or the entire parti

22. Photorec
6) select the destination of the recovered files

23. Photorec:
7) Recovery starts

24. Photorec:
8) Recovery completed

25. Cluster SSH :

26. Comparison Of The Secure Deletion Of
Data Tools On The Basis Of Recovery By
PhotoRec
Images Videos Text
Wipe
Shred
Srm
rm
NO NO YES
NO NO YES
NO NO YES
YES NO YES

27. THANK
YOU
By:
Bhanu Priya