Ideas To Make Code For Robust Image Watermarking

I am doing a project on Image Watermarking using Discrete Wavelet Transform. I have done with watermarked image,Now I am attacking image with attack like rotation. My question is that when I apply function imrotate to the watermarked image, all the pixels that are not included in the rotated image becomes zero as it is property of imrotate. Due to this I got very low PSNR between Original Image and rotated Watermarked image.

My question is-I want to rotate the image but also need to have high value of PSNR after rotation. Is there any method that after rotation all or most pixels of rotated image resembles with pixels of original image.

Shortcoming of imrotate ie zero value of pixels outside rotated area can be removed by which method???????????????

Hello everyone.My question is - I want to make my image unreadable while transmitting it, using chaotic map(arnold cat map, logistic maps, bakers map or henon map.To know more about chaotic map one can visit the site http://en.wikipedia.org/wiki/List_of_chaotic_maps.
#I donot know how to do scrambling and descrambling of my image. In simple words to encrypt it and then decrypt it using chaotic maps.
#I know logic behind this - Key will be used to make our original image into unreadable image and same key is used to decode it. I donot know how to encode and decode it. I need to make key using chaotic map.
#If anyone can help me to make a code to do scrambling and descrambling of input image with the help of chaotic map, It would be a great help.

Currently I'm using Windows 7 OS, in the same hardware I have RedHat ISO Image, is there any possibility to boot Linux ISO image directly from the same hardware?(not by using live CD,USB or any VM Workstation). I have 4 drives in my windows OS, I have ISO image in D: drive and E:drive I allocated for Linux, please try to help me out any one .....

Awaiting for your valuable Support........

I have read about GPG-encryption on the German, English and the Dutch wikipedia and I cannot make sense of it.

So can please someone explain the inner workings of GPG. And by that I don't mean how to make a key. The general idea of it.

Something like: there is Bob and John. Bob wants to send a mail to John in a safe way. He uses GPG for it. And then the story about public and private keys etc. As though I am five years old.

Hello everyone,
i would like to encrypt & decrypt data at the application level.
This data needs to be send to another device via wireless.I found one such cipher named ceaser cipher in the internet.But it looks weak and easy to be broken. Can someone suggest me robust cipher's concepts which can be done at application layer?

I created a persistent USB thumb drive boot with LUKS for drive encryption (250 MB /boot and then 7.5 GB ext3 root). There's no swap partition because this is just to store some private files.

I want to make two or three copies of this thumb drive to store apart in case one gets destroyed/lost.

When I am booted from that thumb drive, can I plug in a same sized drive and just do a

Code:

dd if=/dev/sdb of=/dev/sdc

command to make a copy of itself to another thumb drive without booting to another host OS? This way when I make changes to one (such as to update the OS, apps, or data), I could then just copy the entire thumb drive over to the other two while still booted in the original USB.

Or would I effectively have to shut down, boot to my normal host OS (or other), and then copy the thumb drives when not booted into them.

I want to change the menu on a Suse 12 Enterprise system.
I edit the /etc/default zip12grub.conf file execure grug2-mkconfig. Then reboot the system and no changes occur. The zip12grub.conf seems like the correct file to update so I am at a loss as to what the correct process would be.

cat zipl2grub.conf
## This is the template for '@zipldir@/config' and is subject to
## rpm's %config file handling in case of grub2-s390x-emu package update.

[defaultboot]
defaultmenu = menu

[grub2]
target = @zipldir@
ramdisk = @zipldir@/initrd,0x2000000
image = @zipldir@/image
parameters = "root=@GRUB_DEVICE@ @GRUB_EMU_CONMODE@ @GRUB_CMDLINE_LINUX@ @GRUB_CMDLINE_LINUX_DEFAULT@ initgrub quiet splash=silent "

[skip-grub2]
target = @zipldir@
ramdisk = @zipldir@/initrd,0x2000000
image = @zipldir@/image
parameters = "root=@GRUB_DEVICE@ @GRUB_CONMODE@ @GRUB_CMDLINE_LINUX@ @GRUB_CMDLINE_LINUX_DEFAULT@ "

[test-grub2]
target = @zipldir@
ramdisk = @zipldir@/initrd,0x2000000
image = @zipldir@/image
parameters = "root=@GRUB_DEVICE@ @GRUB_CONMODE@ @GRUB_CMDLINE_LINUX@ @GRUB_CMDLINE_LINUX_DEFAULT@ "

:menu
target = @zipldir@
timeout = 16
default = 1
prompt = 1
1 = grub2
2 = skip-grub2
3 = test menu grub2

grub2-mkconfig -o /boot/grub2/grub.cfg

Generating grub configuration file ...
Found linux image: /boot/image-3.12.39-47-default
Found initrd image: /boot/initrd-3.12.39-47-default
Found linux image: /boot/image-3.12.28-4-default
Found initrd image: /boot/initrd-3.12.28-4-default
done

reboot

Storage cleared - system reset.
zIPL v1.24.1-38.17 interactive boot menu

0. default (grub2)

1. grub2
2. skip-grub2

Note: VM users please use '#cp vi vmsg <input> <kernel-parameters>'

Please choose (default will boot in 16 seconds):
Booting default (grub2)

I'm trying to underclock my netbook's CPU (Intel Atom D2500) in order to save some precious energy.

I tried using the cpufreq utility. However, cpufreq-info yields the following output:

Code:

analyzing CPU 0:
  no or unknown cpufreq driver is active on this CPU
  maximum transition latency: 0.00 ms.
analyzing CPU 1:
  no or unknown cpufreq driver is active on this CPU
  maximum transition latency: 0.00 ms.

So I tried sudo modprobe acpi-cpufreq and other combinations as suggested elsewhere. Loading these modules usually yields

Code:

ERROR: could not insert 'acpi_cpufreq': No such device

So I thought the BIOS doesn't allow scaling. Its configuration is very limited, though, and I couldn't find anything related.

My BIOS is the following (sudo dmidecode):

Code:

BIOS Information
        Vendor: Phoenix Technologies Ltd.
        Version: CDVW712M[2012/04/14] X64
        Release Date: 09/18/2012
        Address: 0xE0000
        Runtime Size: 128 kB
        ROM Size: 2048 kB
        Characteristics:
                PCI is supported
                BIOS is upgradeable
                BIOS shadowing is allowed
                Boot from CD is supported
                Selectable boot is supported
                EDD is supported
                Print screen service is supported (int 5h)
                8042 keyboard services are supported (int 9h)
                Serial services are supported (int 14h)
                Printer services are supported (int 17h)
                CGA/mono video services are supported (int 10h)
                NEC PC-98
                ACPI is supported
                USB legacy is supported
                BIOS boot specification is supported
                Function key-initiated network boot is supported
                Targeted content distribution is supported
        BIOS Revision: 0.1

I couldn't find any information about this BIOS model. Any pointers?

Hello,

I am new to Linux images (pxe, livecd). I would like to add files to a linux image, like something under etc or var, and have the files be available on the client.
The server I am working on was already configured with a pxe image, and only 2 files are present under the pxe client folder: initrd and vmlinuz. So I am wondering if either of these files contain the dirs /etc, /var, etc..., and how I could add files to them.

To give some background, I have done the same thing in Windows. An image in Windows is typically either boot.img or install.img. You can mount either of these to a folder using the Windows SDK tool imagex.exe /mountrw <img file> 1 <mount point>. From here you can add/remove/modify any files you want. Then commit the changes with imagex.exe /unmount <mountpoint> /commit.

Can someone provide insight to the linux image creation process, which of the files (initrd, vmlinuz/vmlinux, etc...) contain what for the client boot, or something similar to the Windows Image editing process?

I know I'm asking for a range of info, but pointers to any material to help my understanding will be greatly appreciated.

Thanks,
Jon

hie

am using ns2.34
i have tried to run: make clean
:make

i got this results

for i in indep-utils/cmu-scen-gen/setdest indep-utils/webtrace-conv/dec indep-utils/webtrace-conv/epa indep-utils/webtrace-conv/nlanr indep-utils/webtrace-conv/ucb; do ( cd $i; make all; ) done
make[1]: Entering directory `/home/mike/project/ns-allinone-2.34/ns-2.34/indep-utils/cmu-scen-gen/setdest'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/home/mike/project/ns-allinone-2.34/ns-2.34/indep-utils/cmu-scen-gen/setdest'
make[1]: Entering directory `/home/mike/project/ns-allinone-2.34/ns-2.34/indep-utils/webtrace-conv/dec'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/home/mike/project/ns-allinone-2.34/ns-2.34/indep-utils/webtrace-conv/dec'
make[1]: Entering directory `/home/mike/project/ns-allinone-2.34/ns-2.34/indep-utils/webtrace-conv/epa'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/home/mike/project/ns-allinone-2.34/ns-2.34/indep-utils/webtrace-conv/epa'
make[1]: Entering directory `/home/mike/project/ns-allinone-2.34/ns-2.34/indep-utils/webtrace-conv/nlanr'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/home/mike/project/ns-allinone-2.34/ns-2.34/indep-utils/webtrace-conv/nlanr'
make[1]: Entering directory `/home/mike/project/ns-allinone-2.34/ns-2.34/indep-utils/webtrace-conv/ucb'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/home/mike/project/ns-allinone-2.34/ns-2.34/indep-utils/webtrace-conv/ucb'


running a tcl file with black hole attack i get the following error, but am not sure whats the problem excatly

num_nodes is set 33
INITIALIZE THE LIST xListHead
ns: _o171 blackhole:
(_o171 cmd line 1)
invoked from within
"_o171 cmd blackhole"
invoked from within
"catch "$self cmd $args" ret"
invoked from within
"if [catch "$self cmd $args" ret] {
set cls [$self info class]
global errorInfo
set savedInfo $errorInfo
error "error when calling class $cls: $args" $..."
(procedure "_o171" line 2)
(SplitObject unknown line 2)
invoked from within
"_o171 blackhole"


give me some reference or some sites where to video tutorials, or pdf tutorials which can help me to solve this problems

i will be very grateful for response