Collaborate Disseminate
It was mentioned that JPEG should not be used between image creation and redaction of sensitive contents, because compression artifacts around the redacted area may leak information. Given how this lossy format works, this makes sense. Is … Continue reading JPEG artifacts leaking information about redacted contents
This question already has an answer here:
As a guy working in security/pentest, I regularly take screenshots of exposed passwords/sensitive information. Whenever I report these, I mask parts or complete info as in the sample given below
I often wonder, is it possible for someone to ‘reverse engineer’ these pics and recover the original information? If so, what should be the correct way of masking such kind of info?
I am using shutter for taking screenshots and using accompanied edit tool to add the black stroke.
EDIT:
As pointed out by some of you, my question is different from this since:
Continue reading Secure way of masking out sensitive information in screenshots? [duplicate]
Can anyone help me in checking if this code is exploitable for uploading a PHP script (backdoor etc) by bypassing the image checking technique used in this PHP script?
online link: http://210.212.119.163/alumni/admin/ajaxim… Continue reading Image upload vulnerability in PHP script
This question refers to invisible 1 pixel images that are placed on web pages to track you via how your browser renders the image. Is there any potential way to discover these images despite them being supposedly invisible? … Continue reading How can I identify invisible online tracking images?
i want to modify TPVD matrix from 2×2 to 3×3 but how i can change ??? matrix g
g=a(1+x:2+x,1+y:2+y);
g=double(g);
d0=g(1,2)-g(1,1);
d1=g(2,1)-g(1,1);
d2=g(2,2)-g(1,1);
lk=[0 8 16 32 64 128];
uk=[7 15 31 63 127 255 ];
I want to know how to view comments or hidden messages in image files.
I want to know this for ctf challenges.
Thank you.
Continue reading How to view comments in image files? (steganography) [on hold]
I used this program to embed some text data in grayscale image, then I compared original and stego histograms in Matlab using imhist function. You can see both on them below:
Can somebody explain to me what exactly is going… Continue reading LSB replacement and its effect on grayscale histogram
I am not totally sure about the terminology but I hear quite a bit about images in websites that somehow take advantage of bugs in software that can be used to compromise a system.
Its not clear to me if these are in the metadata or embedd… Continue reading How to "clean" graphics of embeded exploits?
I am studying the basics of image encryption and subsequently came about some works related to the use of Hilbert Space Filling Curves (HSC) for shuffling the the pixel locations of an image (thereby encrypting the image). Ho… Continue reading Use of Hilbert Space Filling Curves for image encryption [migrated]
I’m reading for awhile on securing my web-file-upload system and thinking on building one my own, but – does one already exist? A secured file upload system that is able to integrate with my own current system? It can be paid and none-paid one.
I am currently using the Spring MVC functionality for uploading files (my purpose is mostly uploading .jpegs) , but could not find it to contain any security measures and looks like I have to implement it all by my own.
Counting this: How can I be protected from pictures vulnerabilities? and this: https://www.owasp.org/index.php/Unrestricted_File_Upload
But instead of writing my own right now, it seemed to me like a basic well-known functionality -> does there exist any library/module/service that is able to integrate my java based backend WHICH is fully SECURED?