Homework on Public and Private Keys - Questions

Blockchain and Bitcoin 101
#3664

  1. A long, random, computer generated number serves as a private key, used as a digital signature to ensure the integrity of one’s identity. Private keys can be used by the holder to generate a companion public key, which can be used for encryption purposes.

  2. It can be used as the public facing identifier, and is also used for encryption purposes.

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#3665
  1. A private key is generated by random numbers and as is unique. A public key is derived or created from the private key. There is no way to figure out or determine the private key based on knowing the public key. The public key of the sender of an encrypted message can be used by a recipient in order to decrypt it since the public key is associated to the private key of the sender.
  1. The two use cases are encryption and digital signature. A sender can encrypt a message using their private key and the recipient can decrypt the message using the senders public key. A sender can also sign a message digitally using their private key and the recipient can verify the signature using the sender’s public key.
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#3666

  1. A private key is just that… A unique number that is to remain secret from others. The public key is related to and derived from the private key, but the public key cannot be used to derive the private key.

  2. Cryptography and digital signatures.

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#3667

  1. They are computer-generated numbers, you can share your public key with others. Others who have your public key can encrypt messages and you can decrypt them by using your private key. You can not gain access to someones private key based on their public key. Private keys can also be used to provide a signature.

  2. It can be used for encryption and digital ID’s

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#3668
  1. A private key is any very large random number. The nature of the private key number is such that as Ivan stated “The universe will collapse before it an be guessed.” A hash algorithm derives a public key from the private key. This means it is a one way creation, you can go private to public but not the other way.
  2. Public keys are used to a. encrypt a message / data b. sign a message or data
    The public key of person X is used by person Y to encrypt a message going from person Y to person X. The private key of person X can decrypt the message. Person Y can use their private key to sign a message / data going the person X. Person X can compare the signature in the message to the public key of person Y to confirm that the signature was created by person Y.
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#3669
  1. Describe the concept of public and private key with your own words. A private key is a randomly generated number which becomes your digital signature. a public key can be generated from that number, while a private key can regenerate the public key, the public key cannot reveal the private key.
  2. Encrypting messages so that only the intended receiver can understand the message when transmitted over a network where other may be “observing” and to create a system that allows agents to verify that the person they are interacting with is the real person “a signature” assuming that you are the only person in control of your private key.
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#3670
  1. A private key is something secret that allows you and only you to see your messages, this will allow you to sign your transactions. If you apply the hash function to it, it wil will get the public key, which can be seen by anyone. When you send transactions, anyone can see your private key, but they’ll se your public one.
  2. Public key can use to see the digital signature of the transaction to verify providence. Also it is used to encrypt a message, so that the person receiving the transaction / message, is the only one able to see it with his private key.
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#3671
  1. Private key is generated to sign transactions, and should not be shared. Public key is generated from the private key and can be shared.
  2. Encryption and digital signatures.
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#3672

  1. Private key is like a password that only you know. Public key is derived from your password that everyone knows.

  2. People can encrypt messages with your public key that can only be decrypted by your private key and you can use your private key to encrypt and sign messages that can only be decrypted and verified by your public key.

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#3673
  1. Everyone can see the public key, it’s used to send encryped messages to the person with the private key. The private key is decrypting the message. Everyone who knows the private key will be able to read the message.
  2. The two use cases are encryption of messages and digital signature.
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#3674

  1. A private key is typically generated by a computer. It must only be known by the owner itself.
    A public key is generated from the private key. The public key can be shared with other users on the internet. From the public key the other users can check if that derives from the alledged sender of the message, if it fits the senders digital signature.

  2. Cryptography can be used as means to verify the adresses of sender and recipient of Bitcoins. It can also be used to generate a private message between two parties on an otherwise public internet.

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#3675

  1. The key pair work to generate completely secure data with a public space, where a private key is a large unique number acquired which then generates a public key. The public key can be used to encrypt a message, which can only deciphered with the private key that generated it.

  2. For message encryption and digital signature verification

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#3676

  1. Describe the concept of public and private key with your own words.
    Private key is a random number from which the public key is generated from which the bitcoin address is generated. This is one way and no one can decipher the private key from the address. Private key is required to digitally sign off a transaction if private key is lost/stolen your bitcoin is gone.

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

Encryption and digital signature

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#3677

  1. Describe the concept of public and private key with your own words.
    The idea of public and private key is a way of protecting and encrypting data so that it can only be read by the intended recipient and no other party.

  2. What 2 use-cases can public key cryptography be used for?
    2 use cases are sending messages and creating a bitcoin address.

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#3678
  1. A private key can be used to encrypt and decrypt data.
    A public key can only be used to encrypt data, it can be shared with everyone, it can only be decrypted by the owner of the private key.
  2. Encryption, so that only the owner of the private key can read it.
    Digital signatures to authenticate the sender.
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#3679

  1. Public and private key encryption is used to confidentially send information or transactions. Public keys are derived from private keys - when messages are encrypted with a public key, only the holder of the correlating private key can decrypt the message.

  2. Encryption and Digital Signatures

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#3680

  1. Describe the concept of public and private key with your own words.
    -> private key : VERY long unique secret number which could be used to identify (sign) or decrypt data
    -> public key : VERY long unique public number calculated with the private key which could be used to check the signature or crypt data

  2. What 2 use-cases can public key cryptography be used for?
    -> to sign
    -> to crypt

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#3681

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

A public key is like the address of a recipient in a transaction and is essential for the transaction for identification reasons. It is also public.

A private key is a private key that is linked to the public key and must be kept secret and safely stored offline, in order to maintain ownership and access for our crypto and confirm transactions.

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

Digital signatures and encryption.

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#3682

Public keys are random numbers derived from your private key that you share with others so people can send encrypted data to you, which then the message can be decrypted by your private key. You never share your private key. Two use cases are encryption and digital signatures.

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#3683

  1. Describe the concept of public and private key with your own words.
    The public key is the encrypted message that anyone can see but not decipher, while the private key is the solution to the encryption that allows the unique holder of the private key to decipher the coded message.

  2. What 2 use-cases can public key cryptography be used for?
    Digital signatures verify who sent the message since the private key derives the public key which creates the bitcoin address. You send bitcoin using your private key and receive bitcoin to your bitcoin address. Cryptography and the use of public and private keys solves the security issue when we use the internet.
    The public key is the address you share so other people can send you Bitcoin to that address. The private key is what grants you access to the funds sent to the public key, which was derived from the private key. Public key cryptography can also be used to encrypt information and secure it from anyone except the intended recipient.

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