Questions tagged [uuid]

Universally Unique Identifiers (UUIDs) are 128-bit numbers used to uniquely identify data. They are globally unique for practical purposes, with an almost negligible chance to being duplicate.

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Is it possible to get the original UUID1 from a timestamp?

Say, for example, I generate a time based UUID with the following program. import uuid uuid = uuid.uuid1() print uuid print uuid.time I get the following: 47702997-155d-11ea-92d3-6030d48747ec ...
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UUID as auth token [duplicate]

I am working on a small IOT device that basically is a status display, which includes data about my phone. That means that I have a simple web server running, which can be used to update the devices ...
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112 views

Are GUIDs safe for long lived access tokens?

There is a peice of software i am using at work that has several components to it, lets call them the server and agents. the server runs an api over https that the agents use to communicate with it. ...
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Passing user ID as parameter without any authentication, what are the security risks?

I've read that passing GUID as URL parameter isn't considered insecure because usually, an app has an authentication mechanism (checking against some session token). However, how secure would an ...
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Identifying devices in mobile app using UUID

I have a mobile application, for Android and iOS (both native), that communicates with the backend through a REST API (over HTTPS). The application allows users to sign in or use the app as a guest, ...
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COM Classes CLSID

Would malware ever create a CLSID or would they just use them? This question is derived from studying COM objects. So an Adobe exploit would have an Adobe CLSID in it. Does malware ever create a CLSID ...
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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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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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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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246 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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158 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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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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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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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 ...