Public Key Infrastructure – Asymmetric Encryption Workflow + Signature

Let's say that Alice wants to send an encrypted message that only Bob can read, and confirms that Alice is the person who wrote this message.

What is the procedure to follow?

When I see the digital signature process, I always see that the message is transferred "clear" to the recipient (so that Bob can chop the document on his side and compare it to the hash received by Alice), but the encrypted part (with Alice The private key) is always the hash.

What happens when we also want to encrypt the message to a specific person? Will there be a "second encryption" process, in which the message will be encrypted by Bob's public key?

Just an example to confirm:

  • Alice produces a digital signature: creates a hash of the document and encrypts it using its private key.

  • Alice encrypts the message itself: takes the document and encrypts it using Bob's public key (thus, he is the only one able to decrypt it using his private key).
    key). (I guess if the document is large, it can take a long time
    finish the process, no?)

document library – Direct download link for the SharePoint public file

I'm looking for a way to allow users to download a file directly without having to click the "Open" button.

https://veodin2.sharepoint.com/:u:/g/Sales/EZdR8fpZ66NNqPvMdgN0gNYBXfi5vCRhMeKoPnkKuGJ4PQ?e=SFw9sv

It seems that the other answers do not concern public files / SharePoint libraries only "personal" documents.

recover private key – How can I generate key pairs and compare the public key to a known public key to search for a match?

Running on Ubuntu Linux without a head. I would like to use this key pair generator and check the public keys generated at each run against another public key.

I know that "recovering" a lost private key is impossible and what is not. But I'm not asking if it's a good idea or a bad idea, but how I can accomplish the process of generating key pairs and checking the public key. The address I check is that of pre-HD portfolios. I do not know if it makes a difference, but may be relevant.

Consider this as a proof of concept,
I would like to generate the keys, compare with the known public key string, and then if a match is found: save the public and private key information to a file.

I think I'd be delighted with that, or maybe it would be great, but at the end of the day it would require direction.

Attack Prevention – How can I assess the difficulty of suddenly combining certain public information?

I'm designing a piece of software whose information will be public, but I'm wondering how far this information can withstand external analysis without using a specific security mechanism to protect it.

The question attempts to evaluate the difficulty of combining different information abruptly, which makes sense when combined, but not when viewed individually.

  • A software has multiple users. The number of users increases over time, but can be considered at any time as a "fixed snapshot".

  • Each user can be assigned one or more items in a list of 30,000 pieces of software.

  • Each user can not be assigned an item twice (for their own use), but all other users are free to be assigned items from the same set of 30,000 items under the same conditions, that is, to say without duplicates.

  • Users are not logically connected at all (their credentials are blokchain style addresses), so everyone can be considered independent in one respect, but if they are a group, each address can only be one group at a time.

  • When users join an entity, the number of members of that entity is private and unknown outside the entity itself. The entity consists only of user addresses and no other type of member. The theoretical maximum number of entities is therefore the maximum number of users.

  • Many entities may exist and as a result, many, but not all, users will be associated with an entity.

  • Members of the entity may have received the same items.

  • It is also possible that unique items have been assigned to them when they are viewed as a set of items.

  • No information indicates that two members are in the same entity.

  • All elements and all users are publicly known.

  • All items assigned to a user are publicly known to be associated with that user.

The task of the adversary is to discover which users are part of the same entity, and therefore which elements have been assigned to them. I suppose that can be brutal by simply looking at the combinations.

Assuming that the number of users and entities increases, how far has it become infeasible from the computer point of view to try to force this task abruptly? In other words, how many users, how many entities is this enough?

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architecture – How to model public identifiers?

When creating the architecture of a new project, I have trouble finding a good solution to manage public credentials.
For example, our users will receive a membership card. The member ID is printed on each card. But, in our business area, we expect cooperation with other companies, the format of these credentials could change in the future, or we will use additional credentials .

True, the member ID is not the primary key of the internal database or something like that.

These are the two options that I came:

  • The member ID is a property of the user template.
    • It is easy to question.
    • But then we have to change the model and schema of the database whenever we have a new format.
  • The membership ID has its own template that refers to the user template
    • It's easy to expand.
    • But then we have to join two tables for (more or less) each request

I know that this depends heavily on many factors for which this question is too brief, but is it advisable to wait for changes to the database schema instead of explicitly modeling this type of flexibility. I mean, it will only happen once in a few years.

Or do you have other ideas?

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applications – What is the main difference between using a click on the button after making the class public?

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dns – Securing a public Pi-Hole?

I use these instructions to set up a Pi-Hole on a Google Compute server always free.

The ultimate goal is to route DNS requests from my Google Wi-Fi home router, as well as being able to use it via my phone while on the move. (Also gives access to friends and family)

I can not configure a VPN with Google's Wi-Fi router, but only a custom DNS, but it seems to me that I could restrict access to the compute instance by only allowing the access to my home network through Google Compute firewall rules. (The home network has a static IP address)

The problem is that it will prevent me from using it with my phone.

I think I'm attacking the problem the wrong way. I would like to be able to simply point my phone and my home network to the calculation instance via a custom DNS. The problem is that I put the Internet at risk if I allow the server to be accessible to the public.

Is there another, perhaps more creative, way to do this?

In the comments on this page, it is suggested to use iptables tools like fail2ban. Is this a good practice?

Import PKCS11 public key into BouncyCastle

I use an HSM to generate a public / private elliptical key pair using PKCS11 commands, but I have to use the public key in BouncyCastle.

I can read the EC_POINT attribute in DER format, but I do not know how to import it into BouncyCastle.