Homework on Public and Private Keys - Questions

Blockchain and Bitcoin 101
#4287

1/ public key is for any one to see and the private key it is just for you to know.
2/ to be able to sign a digital contract, documents

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#4288
  1. Public-key cryptography is a form of encryption in which key pairs are used. A private key, which creates and corresponds to a public key. The public key is used to encrypt messages designated to the owner of the corresponding private key, which is used to decrypt the message. The private key can also be used to sign a message so that anyone with access to the public key can verify its source.
  2. The two use-cases for public-key cryptography are encryption and digital signatures.
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#4289

it can also be used for encryption.

#4290

Your private key is a key that only you should have access to, you should never share this with anyone. You use your private key to generate a public key. Your public key can be shared publicly (e.g. through twitter, on your blog, etc.) and people can then use it to send you encrypted messages that you can unencrypt using your private key. You can also use your private key for digital signatures when sending bitcoin to a recipient. The recipient can then use information from your public key and signature to verify that it originated from your private key, this way verifying that you were truly the original sender.

A public key can be used for encrypting messages in peer to peer transactions. It can also be used for verifying that a digital signature is signed by the person who they claim to be.

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#4291
  1. Public and private keys are generated based on cryptography. A private key can be used to determine a public key, but a public key can not be used to determine a private key.
  2. Encryption and digital signatures
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#4292
  1. Describe the concept of public and private key with your own words.
    Private key is something that is randomly created by your computer and a special mathematical formula creates a public key which is based on your private key. These keys make the whole process of buying/selling crypto possible.
    There’s no central authority that takes care of bitcoin accounts. People use wallets and wallets are based on public/private key pairs. Bitcoin is very reliant on this technology. In crypto digital signatures are used and it’s possible to verify who sent you a message. Using your private key to sign a message allows for the public key to be compared with the signature to prove that it was created by a private key.
  2. What 2 use-cases can public key cryptography be used for?
    Encryption and digital signatures.
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#4293
  1. A public key is an encrypted message that is derived from a private key. The private is a generated, random number that the creator keeps secret from everyone and which he/she utilizes to decrypt a message sent to him/her via the associated encrypted public key. A public key cannot be used to decrypt the private key but as previously mentioned the private key can be used to decrypt the message of the public key.
  2. The 2 use-cases that public key cryptography can be used for are encryption and digital signatures.
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#4294

Public and private key cryptography is a clever way to transmit information such that one can be sure that the sender of some information is who they say they are.
There are two components that each address has: A private key and a public key.
The private key is kept secret and whoever has access to it has access to the address itself.
The public key is derived from the private key using a one-way function and is viewable by anyone on the internet.

Encryption: Let’s imagine we have two people (person A and person B) that want to communicate with each-other over the internet, but they do not want anyone to listen in.
In order for A to send a message to B they will encrypt the message using B’s public key. A curious attribute of this encrypted message is that the only way to decrypt it is to use B’s private key. Thus A can send messages to B that only B can read, and B can do the same operation the other way around.

Digital signatures: Another slightly different use-case of private and public keys is called digital signatures.
In the case that A wants to send a transaction to B, B wants to verify that the transaction is actually from A. The way A does this is to derive a signature from their private key and attach it to a transaction. This signature can be verified to originate from A’s private key using A’s public key.
B can then verify that the transaction was actually signed using A’s private key.
Importantly, anyone else listening in can also verify that the transaction was signed by A.

This is an interesting difference between encryption of messages and signing of them:
When encrypting messages you want to hide the contents from everyone by the receiver, but when signing a transaction you want to prove to everyone that you are the sender. Yet they are not opposites. For instance: It is completely possible to encrypt a message so that only B can read it, but sign it so that everyone can verify that A is the sender.

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#4295
  1. The Concept of public and privat key is a way to encrypt messages with such a high security level, that it is mathematical impossible to guess the private key of someones bitcoin adress for example. Making the exchange of data or value (Bitcoins for example) securer than ever before.
    2 . For example sending sensetive date or funds via an unsecured connection. Also verifying your identity via your private key.
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#4296

1.Public keys are used to encrypt or digitally sign data being sent across the blockchain network. private keys are then used by the owner to open the message or data with the corresponding public key. private keys are hidden to everyone but the owner and they generate a specific public key to communicate with.
2.encryption and digital signatures.

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#4297
  1. Describe the concept of public and private key with your own words.

The public and private key are always related, with the private key you get the public key, the public key is the address that anyone can see and it is the address that you give to your friend, for example, when you want to receive money, so your friend will send you money with his / her public address signed with his / her private key that only he / she can see.
They are used to encrypt msg in a network, therefore, when I want to send you fragile information, you will give me your public key and I will send the message to your public key that is associated with your private key, therefore only the private key can unlock the message.

  1. What 2 use-cases can public key cryptography be used for?

They can be used for message encryption and as a digital signature.

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#4298

  1. Describe the concept of public and private key with your own words.
    A private key is a password or passphrase used to decrypt information sent over an open network. The public key is known by anyone wanting to know it and is used to encrypt information.

  2. What 2 use-cases can public key cryptography be used for?
    Encryption of signed digital documents or digital ledgers eg Bitcoin

In my Turing Stoned game there is a hit address. The game needs that to shift Turing to the next location. The game records this as the “bit address”. You see we hit that ugly face so many times that it started breaking apart. Players started arguing there wasn’t enough of that ugly face to go around and what was left well it was getting hard to read the branding. The bit cash bros forked one way. I’m sure somebody left Jaws marked on that ass. Arguing ensued for a time but then we decided to use bit addresses to keep a new score.

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#4299

  • Describe the concept of public and private key with your own words.
    Randon and unique strings of numbers. First we generate a private key, randon numbers, this must be kept secret at all times, from that we derive a public key that can be known to other. This is also one way road , we cant reverse it and obtain provate key from public. We can then use this key to communicate in digital world respectively using private key for higest security matters and public for others. Even though it may not seem but its almost not possible to generate the same key as there is this many posibilities and very low probability of them being the same

  • What 2 use-cases can public key cryptography be used for?
    Encription and digital signature

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#4300

  1. Describe the concept of public and private key with your own words.
    Public key is made available to anyone who wants it. Shared on the internet. Private key is kept secret. Also signs transactions

  2. What 2 use-cases can public key cryptography be used for?
    Encryption and Digital signature

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#4301

1.Describe the concept of public and private key with your own words.

Private Key generates public key using formulas. this public key can be used to encrypt the message which can be only read using private key ( basically send encrypted message in a public or unsecured forum/connection.

  1. What 2 use - cases can public key cryptography be used for ?

encryption of messages and for digital signatures for sending funds.

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#4302

  • Describe the concept of public and private key with your own words.
    Your private key is only for the user and public keys are shared with the public. The public key is autogenerated from the private key and can be used to send encrypted messages. The private key can decrypt received messages or be used as a signature or fingerprint.

  • What 2 use-cases can public key cryptography be used for?
    Public key cryptography is used for encryption and digital signatures.

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#4303
  1. A private key is a very large number generated by a computer. A public key is derived from a private key using a mathematical formula. The public key cannot be back-engineered to retrieve the private key, however the private key can always derive the public key.
  2. Private/public key cryptography can be used to encrypt data, as it is essentially a password system. It can also be used to verify the sender of a message, as all codes are unique.
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#4304

  1. Public and private key ensure safe passage of information between two parties waaaaaay before the universe collapses on everyones head and the sun may explode still whilst inner self is still going very parabolic… yeyey

  2. Encryption and digital sigs

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#4305
  1. Describe the concept of public and private key with your own words.
  • a private key is a unique identifier of randomly generated numbers that should be known only to the user, a public key is derived from the private key and can be shared
  1. What 2 use-cases can public key cryptography be used for?
  • message encryption - allowing one user to send a private message on a public forum
  • digital signatures - verifying that a message was sent from the user
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#4306
  1. Describe the concept of public and private key with your own words.
    Public key can be shared with the world and is used to receive funds such as Bitcoin, it is created by and linked to your private key which is secret and should be kept secure/personal to you.
  2. What 2 use-cases can public key cryptography be used for?
    Encryption and as a digital signature
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