Homework on Public and Private Keys - Questions

Blockchain and Bitcoin 101
#527

  1. The public and private keys have a mathematical relationship. The public key is generated from the private key via a one-way function, whereby the private key cannot be physically or mathematically derived from the public key. The public key is designed to be shared in open forums for the purpose of receiving encrypted messages or transactions from other users, whereas the private key is designed to be kept secret and used only by its owner to decrypt and sign transactions.

  2. Public and private key cryptography is designed for two specific use-cases, that of encryption and digital signatures. A public key serves as a method to send and receive encrypted messages and/or transactions, while the private key provides a means of ensuring the integrity of the data and verifying the identity of its sender.

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#528

  1. A private key is your personal wallet address. All of your public keys are linked to this private address, but it is impossible to derive a private key from a public key. If someone were to get your private key they would be able to steal all of your coins, but you can share your public key with anyone and everyone and your coins will be safe. The public key can be given to others and they can send money to that address and it will go to your wallet (or your private key). You use your private key to send money out of your wallet, but the recipient of that money will not be able to see your private key.

  2. Public key cryptography can be used for digital signatures, which is a way of verifying who is sending a transaction or message. The public key of the recipient of that message or transaction can then verify who is sending it through the use of the senders public key (which is attached to their private key and can be seen as the senders signature). Public key cryptography can also be used for encryption, which means that someone can use someone else’s public key to send a message, and the intended recipient can only read that message by using their private key. Encryption is not largely used in crypto, but digital signatures are used in cryptocurrencies.

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#529

  1. Describe the concept of public and private key with your own words.
    a random alphanumeric is generated to produce a private key that is completely anomalous, a public key is generated from the private key to enable encrypted communication between two party’s…

  2. What 2 use-cases can public key cryptography be used for?
    sending encrypted communications between two parties, and validating information making sure is has not been tampered with.ensuring it is original content.

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#530
  1. Describe the concept of public and private key with your own words.

A public key is generated by the computer as a random number which later can produce a public key, this two would mathematically linked together and can only exist together. A private key is meant to be kept secret whilst the public key everyone can know. With the private key one can decrypt a message encrypted with your public key.

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

Encryption and Digital signature.

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#531
  1. Describe the concept of public and private key with your own words.
    The concept of Public and Private Key first starts with the Private Key. The Private Key is a random number which is selected/chosen/generated. The Public Key is then derived by an algorithm, inclusive of the Private Key. Therefore, the Private Key can be used to determine the Public Key, but the Public Key can’t be used to determine the Private Key. It is also because of this relationship that one can share ones Public Key on the internet and elsewhere, but one should never share the Private Key. This is because, depending on how you use your Private Key, someone will have access to any information which is secured with that Private Key. The Private Key serves as the initial Key to unlock everything. This also includes Digital Signatures, which are also derived from the Private Key. They can be attached to a message and confirmed with the Public Key, thus validating the user (as both the Signature and Public Key are derived from the Private Key).
  2. What 2 use-cases can public key cryptography be used for?
    Public Key Cryptography can be used for:
    • Financial Donations. The Public Key can be shared and persons can donate towards any cause.
    • Tips. Someone can provide information (for whatever reason) to a public address, without having the information accessible to the general public.
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#532

  1. Public/Private Key pairs is a methodology of cryptography allowing information to be sent on public channels but only accessible to the sender and intended recipient. The public key encrypts the information, and is visible on the public channel, yet requires the private key to decrypt the information.

  2. Public/Private Keys can be used for secure encryption, as well as to enable digital signatures.

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#533
  1. Describe the concept of public and private key with your own words.

A Private Key is a randomly generated numeric key that is used as a unique ID.
It is a secret key and is never shared with anyone else.

A Public Key is generated from a private key and is used to interact with the public.

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

The 2 use-cases for public keys cryptography are encryption and digital signatures

  • Encryption: Uses a receiver’s public key to hide the data so that only the receiver can see it.
  • Digital Signature: Uses private key to generate a unique signature that can be verified comparing a
    senders signature and public key.
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#534
  1. A public key encrypts the information you want to send (in the case of Bitcoin it is a transaction), while the private key decrypts the information that was encrypted with the associated public key.
  2. Encryption and digital signatures.
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#535

c and Private Keys - Questions

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

Allows the sending of private messaging between 2 users. The sender of the message send a message using the public key of the sender. Only the receiver has the private key to unlock that message. As the private key creates the public key there Is no way to determine what the private key is keeping the message safe and secure

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

Sending secure messaging over a messaging platform such as email or what’s app.

Sending crypto transactions where the private key is used to sign a transaction sent with the public key verifying that the transaction has to be legitimate

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#536
  1. Private key is a large random number this then used to create a public key another number. Private key can work out public key but public keys cannot be used to workout the private key.
  2. To identify that a person is whom they say there are. This in turn helps to preserve the integrity of a system. Ensures honesty and trust.
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#537
  1. The private key is a large string of numbers that when hashed, produces the public key. The public key is liked to the private key but does not show the private key’s information.
    Ex: Your email. You show your email [email protected] to users but they aren’t able to access it as your password is your private key.
  2. Use-case #1 The public key can be used to verify that the identity is you without giving up your private key and to message & transact.
    Use-case #2 The public key can be used to create an identity that you show to the public.
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#538

1 Describe the concept of public and private key with your own words./ A public key is for others to send encrypted data to me and a private key is for me to decrypt and receive the data.
2 What 2 use-cases can public key cryptography be used for?/ One use case for public key cryptography is sending encrypted text and use case is sending encrypted funds.

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#539
  1. Private keys are just that - private and only for you to know. If someone else knows your private key then they have access to your data or Bitcoin. A public key is generated from the private key and is used in the public domain for transacting. The private key can decode the public key, but the reverse is not possible.
  2. a) sending crypto-currency
    b) sending sensitive information to a recipient over a public network.
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#540

  1. Describe the concept of public and private key with your own words.
    The private key is a random number, which basically is my secret identity. It by all means need to be kept private. With the private key I can decrypt messages or transactions, but also sign them.
    The public key is generated / derived from the private key. The public key is visible for anyone, and can be used for encrypting data.

  2. What 2 use-cases can public key cryptography be used for?
    a) Encryption
    b) Digital Signature

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#541
  1. Describe the concept of public and private key with your own words.
    public key is for transactions with others and private key is like a key to your house
    which only you can open it
  2. What 2 use-cases can public key cryptography be used for?
    to receive funds from others and for ID
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#542

A private key is a random string you can make up yourself. You have to keep it secret. From that private key a hash can be generated, which is called the public key. The public key can be shared with everybody because it is infeasible to generate the private key from the public key.

A use-case is encryption of messages. If I want to send a secret message to Rudi, I encrypt it with Rudi’s public key before sending it. If somebody “catches” the message, he cannot read it, because it is encrypted. Rudi can read it though, because he has the private key which allows him to decrypt the message.

Another use case is signing messages, where you can create a signature with your private key to proof that the message was written by you.

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#543
  1. Describe the concept of public and private key with your own words.

Private key provides a proof of ownership, while a public key creates an open communication channel to you. Ie. messages or currency.

  1. What 2 use-cases can public key cryptography be used for?
    a. Encryption, allows messages between 2 users to know the contents on a public network. Only the users of the 2 signatures can interact with the code. Ie a hacker cannot intercept.

b. Digital signature, identify and ensure integrity of a message.

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#544

  1. Describe the concept of public and private key with your own words
    One generates a Private key and out of a public key one can create a public key. Public key can be used for encryption and identification(sending a message or transaction). Private key should be kept secret for whoever owns the private key can decrypt the data.

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

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#545

  1. private keys: random number that decrypt all of information to the public keys. public keys is: encryption that can be shared using mathematical use c

  2. digital signature, and massage encryption

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#546

Someone generate a random number (private key). Based on a formula he can generate the resulting public key. The public key can be shared all over the internet. The public key is derived from the private key. It is not possible to take the public key and determine the corresponding private key (it is only possible in one direction). With the private key you can sign something and other people can see (using public key) if you are the origin. With a public key from someone else I can encrypt something which then he can decrypt with his private key.

  • Encryption
  • Digital Signature
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