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Questions tagged [guid]

The tag has no usage guidance.

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28 views

set-guid exploit of a programm with relativ path

I'm trying to exploit a program which has the set-guid bit enabled. The program is simple it contains the following (stage.c): #include <stdio.h> #include <stdlib.h> #include <unistd....
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2answers
42 views

Purpose of using GUID for files along with underlying permissions checks

Some sites utilize a GUID for a file name when it goes in storage. For example, when you load up a receipt, instead of having the receipt named something like 1200 (an incremental number), it will ...
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2answers
64 views

How to solve the problem of secure randomly generated GUIDs when the size of the data outgrows the GUIDs

I've been struggling with this problem for a little while... How to hide the order that records were created in, basically. You typically do this by generating a "GUID". But this GUID is arbitrarily ...
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0answers
55 views

Using a GUID as an authentication token (and how it could be improved)

I'm implementing a Whatsapp Web-like feature for my Android application. User should be able to open an HTTPS web application that displays a QR code (a GUID generated by the server) and scan it using ...
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1answer
111 views

Mobile application authentication using UUID

I write back-end code for mobile applications. I am needing to write the code for authentication and the simplest yet secure solution I can think of is: When user signs in, device sends username and ...
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1answer
118 views

Using the user's GUID-id as a salt for Rfc2898DeriveBytes

I use the Rfc2898DeriveBytes for creating an AES key for protecting the user's data. For the salt value I would like to use the user's id, which is a guid. My understanding is, that the only drawback ...
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2answers
3k views

Using V4 UUID for authentication

I'd like to use a V4 UUID / GUID for authenticating users. To be specific, the user would have to paste the UUID into a text field to gain access to their account. The UUID would be given to them at ...
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1answer
18k views

Why does UUID v4 have the format xxxxxxxx-xxxx-4xxx-zxxx-xxxxxxxxxxxx? [closed]

I'm very curious as to why the format is xxxxxxxx-xxxx-4xxx-zxxx-xxxxxxxxxxxx? Why is the 4 there, and why is z always either 8, 9, A, B? And also, why the different string lengths between the dashes? ...
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1answer
221 views

With a very large number of GUIDs, can one predict the previous and subsequent GUIDs that will be generated?

I've been reading up on GUIDs. According to the Wiki: Cryptanalysis of the WinAPI GUID generator shows that, since the sequence of V4 GUIDs is pseudo-random, given full knowledge of the internal ...