Cryptography – Secret Key Sharing Protocol

I need to find the simplest and most robust secret key sharing protocol possible.

In the beginning Alice shares a key Kas with the server and the same for Bob (kbs), but Alice and Bob share no secret.

regulate

  1. Every time B stops thinking that he has received data K from A, A has sent K well to B.
  2. Each time A ends sending data K to B, B has received K.
  3. The data K is a secret between A and B (and the server that is believed to be trustworthy).

The proposed protocol may only use symmetric encryption, hash functions, and pairing.

Which protocols that meet these conditions exist today?

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Privacy – Why should relatively public personal information be kept secret online, if at all?

I do not want to get involved in technical terms, but just lay the groundwork for this question: I understand Personal Identification Information (PII) as the information that is invisible to people who intersect daily with you and that it might be used to To prove your identity. For example, my name and face are not really private because anyone I happen to do business with could get that information. My date of birth and address are much less obvious and are considered PII. My social security number is a very different level of private, sensitive personal information (SPI).

I grew up in the wild west of the Internet (there is Rand-PII – approximate age) and I was advised never to divulge information about PII types. Basically hide your true identity as much as possible for the sake of safety.

Now, if I know more, I wonder if this precaution is justified, especially in relation to the persistence of the person between platforms where some PII could leak out. For most internet users, I certainly do not want my name tied to it, but I do not feel like I generally have to cover my tracks. Conversely, I see some advantage in having my actual or pseudonymous identities persist online and I would not object if easily checked or simply certain users connect points between people, ie friends or acquaintances who know two different profiles, me represent, including a PII-filled as LinkedIn. I ask if my intuition is right or riskier here than I think.

The risks of uncovering PII are in my opinion:

  • identity theft
  • stalking
  • Plan crime
  • Doxxing / Defamation / Harassment

For these reasons, I can see reason to publicly use a pseudonym posting. But I generally do not consider these threats to be particularly worrying when I meet someone on a message board or a stranger on Facebook or LinkedIn. Someone who finds my profile on LinkedIn already has a lot of information that could bother me, just as it is useful for potential employers to review me. It has to do with target incentive: why me among many others? And even if someone was pursuing one of these malicious acts online, how would it be otherwise or more likely to encounter that malice in a completely offline relationship? Is it that the Internet is bigger (the likelihood of me coming across bad apples is greater) and may have a deeper insight into my life (the vulnerability of bumping into bad apples is greater)? An online criminal can choose from any number of other profiles from which he can retrieve information. Unless I reveal SPI, this seems to be a basic PII, and my online activity is no worse than exposing my PII and & # 39; in real life "day to day activity.

Why should relatively public personal identification information be kept online, if at all?

Spells – What is a "safer" alternative to a bag full of holding / secret chest?

The best solution to keep VERY SAFE Your valuables would be a kind of pocket size. There are several ways to create them, most of which are included in this question:

How does a PC create a permanent extra-dimensional space?

There is also the Planeswalker Prestige Class in the Manual of the Planes, which creates its own Pocket Dimension as part of the Class Kit.

Otherwise, the good alternative would be to simply use the aircraft displacement / gate and create your hiding place in an uninhabited level of existence, or at least in a place where nobody lives. At lower levels, you can do exactly the same thing with teleport magic and a remote location.

sharepoint online – Vendor hosted apps – client ID and client secret

If you generate a client ID / secret, you must specify the domain in which the app resides. You can only specify a single domain. When you generate the ID / secret, the service principal is created on the Azure tenant, using the client ID and client ID / domain as SPNs.

For example with an ID of 123e4567-e89b-12d3-a456-426655440000and a domain of contoso.comare the following service principal names:

123e4567-e89b-12d3-a456-426655440000
123e4567-e89b-12d3-a456-426655440000/contoso.com

These must be unique for all service principals, meaning you can not have two apps with the same client ID.

However, you can have any ID / secret used by an app. However, if the domain does not match the domain for which the ID is registered, users will receive a warning when they navigate to the app (though they can go through it).

If you're interested, here's an answer for generating IDs / secrets about PowerShell. I also have some scripts for retrieving / updating secrets.

rest – back up API access. oAuth client credentials against client ID and secret

I have a REST API called from other third-party external servers over the Internet and used only for machine-to-machine communication. I'm looking for mechanisms to secure this API so that only certain servers can use this API. I do not control the servers and can not guarantee the IP addresses used by these servers.

I thought about using the OAuth client credential flow to secure the API by assigning a client ID and client secret to each external server. But that made me realize why I'm using OAuth at all, and I do not directly deal with the client ID and the secret, that is, when the external servers call my API, the client ID and secret of the client are passed, and if a compromise entering, I will revoke the client secret and the communication will no longer be allowed. So that the communication starts again, I will issue you a new customer ID and a new secret.

Is this approach right? If not, what is the benefit of using the client credentials in OAuth if the external server needs to store and pass the client ID and secret to still receive a token.

What can Adam Schiff do if these Republican congressmen and senators continue to invade and disrupt his private and secret court?

If you enter a safe area without permission, a person may be shot. I agree. When I was in the Navy, they had signs saying, "Safe area, requiring prior permission to enter, lethal force allowed". Even we registered types were smart enough not to step in if we had no authority.

Of course ship holds no court. He leads a committee meeting as this is his job. His committee is not authorized to convict anyone. I know that most Republicans were clearly sleeping in the Citizenship Course, but I had thought that the house would not keep a court, was well known. I think that's the illusion I get because I do not hang around with idiots.

If the Committee's inquiry gives the impression that criminal offenses have been committed, as evidenced by the vote of the majority committee, the committee will send indictments to the entire House. The whole house then conducts hearings and can call witnesses to these hearings. After the debate, etc., the whole house votes. If the House decides to bring charges, the indictment's articles are submitted to the Senate, which is holding a lawsuit.

The Senate process is the first process of the whole process. The person charged by the house can interrogate witnesses and call refuting witnesses. The Senate then votes on every indictment in the indictment. The conviction lasts 60%. A conviction for any reason removes the person from office. If the person found guilty before a court, the Senate decides by a separate vote whether the person will be excluded from the exercise of the Federal Office in the future. Only a simple majority is required for this vote.

sharepoint online – Authenticate a C # / WPF app with CSOM and Client ID / Client Secret

I've developed a desktop application that accesses our company's SharePoint Online Web site to use multiple lists. Currently, this app uses username / password credentials to obtain an auth cookie, which will then be used for each subsequent access. This auth cookie expires only when the user changes their password, prompting them to reenter their new password and obtain the new auth cookie.

Now, enterprise IT has decided to abandon this "legacy authentication" and switch to "modern authentication". As a result, my application will no longer be able to access our website, as username and password credentials will no longer be accepted.

I now look at modern methods of authentication with our SharePoint Online site that lead me to using application-specific methods Client ID and Client Secret,

First, how (if at all possible) can I authenticate my app with ClientID/ClientSecret? I would really appreciate a snippet of code that (if possible) is based on nothing else than CSOM, I have already learned it SharePointPnPCoreOnline Package and confirmed that it works, but it depends on a large number of other packages that I do not need to distribute with my app. In addition, after authentication, any action that this app performs on a list should be recorded as being in the context of the user running the app (CreatedBy/ModifiedBy Columns should have the actual user running the app).

Second, if this is not possible with CSOM, I have begun to investigate the use of it MSAL.NET (which seems to be the recommended method), but nothing I've found so far has led me to solve my problem explained above. Again, I would welcome a snippet of code that represents the entire process of this type of authentication.

If using ClientID / ClientSecret is not your best bet, I'd like to know what other options I have for my WPF application to correctly authenticate and use CSOM.

UPDATE 1 – Use as reference SharePointPnPCoreOnline package, this is the code segment that worked:

AuthenticationManager mgr = new AuthenticationManager();
using (var context = mgr.GetWebLoginClientContext("https://mycompany.sharepoint.com/sites/MySite"))
{
    context.Load(context.Web, web => web.Title);
    context.ExecuteQuery();
    Console.WriteLine(context.Web.Title);
    Console.ReadKey();
}

This will bring up a window for a few seconds, and once it is closed, the window will be authenticated accordingly ClientContext returned.

I tried with GetAppOnlyAuthenticatedContext. GetAzureADAppOnlyAuthenticatedContext and GetAzureADNativeApplicationAuthenticatedContext but none of them seemed to work.

UPDATE 2 – Since I still can not find a suitable solution and there GetWebLoginClientContext from SharePointPnPCoreOnline The package works well enough to solve my immediate problem. I simply chose this particular method and put it directly into my app (which eliminates the huge amount of dependency). For reference, this is the implementation of this method:

https://github.com/SharePoint/PnP-Sites-Core/blob/master/Core/OfficeDevPnP.Core/AuthenticationManager.cs#L322

I will continue to update this post if better solutions are available.