Homework on Public and Private Keys - Questions

Blockchain and Bitcoin 101
#4247
  1. Describe the concept of public and private key with your own words.
    In cryptography, every entity can generate a random number, called PRIVATE KEY.
    The PUBLIC KEY is derived by the private key through a mathematical function.
    The public key is “public” and it is used for encrypting and decrypting messages
  2. What 2 use-cases can public key cryptography be used for?
    encryption/decryption
    digital signature
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#4248
  1. In order to achive security and authenticity in modern communications we use public and private key concept which assume that the public key is a shared key created by using private key, any message, transaction can be encrypted with private key and decrypted and verified with public key. Private key is always kept secret, public key is shared with others.
  2. In a secure communication public and private keys used to create digital signature and to encrypt/decrypt data.
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#4249

Transactions, at least on Bitcoin are not encrypted :wink:

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#4250

Ohh man thanks, appreciate that. Thanks for correcting me!

#4251

  1. Other people can send an encrypted message using your public key that only you can access, the public key can be solved by the private key but the private key cannot be solved using the public key.

  2. It can be used to send an encrypted message or to validate the sender of a message.

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#4252

  1. Describe the concept of public and private key with your own words.
    The private and public keys are forms of Digital Signatures that ensures the integrity of a particular message. These private and public keys are collaborative pairs of encrypted messages that work in co-operation to verify who sent the message. In order to receive a sent message, the receiver must generate a random number called the Private Key which is kept secret. Then through a special formula, the receiver takes this private key and the computer then generates a public key based on this private key. The public key is then shared on the internet which the receiver may share everywhere for the world to see. It is also mathematically impossible to take the public key to the private key. The private key is secret and the public key goes everywhere.

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

Two cases where public key cryptography can be used are in verifying BTC transaction. Everyone can verify that a bitcoin transaction was spent through the display of the private and public key pair, legitimizing it as a BTC address. Any legitimate private and public key pair automatically serve as a BTC address.
Another usecase for public key cryptography to be use is the public key signing of digital documents.

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#4253

Computer generate a random numbers, these numbers are called private key.

Following certain function public key is generated through private key.

Private key is secret and very important, only the owner has it. In other words, who has the private key, who owns the assets.

Public key can be known by everyone in the entire network.

  1. In encryption: The sender combine the public key of receiver with the secret message, encrypt it in the public network.
  2. Digital signature: Sender’s digital signature (which is generated by private key of sender) and sender’s public key work together, in order to verify the transaction.
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#4254

The private key is genererad by a random number. The public key is then derived from the private key throug a one way function.

The private key can be used as a digital signature to a messages that can then be decrypt by the receiver with the public key of the sender.
The sender can use the public key of the receiver to encrypt a message that then only can be decryptet with the receivers private key.

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#4255

Public key is for folks to send secret messages or cryptos to me, where I can use my private key to decrypt or to receive cryptos. I need to keep my private key very very safe

Public key cryptography allows transmission of secret information without the need of exchanging encryption keys. as well, it allows receivers to validate if indeed the message is sent by the receiver when sender signs with his/her digital signature.

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#4256

  1. The private key is a long randomized number that is generated by your computer when you make a wallet. The public key is than derived from the private key. It is not possible to go from the public key to the private key. The public key is for the world to see and the private key must be kept secret. Anyone can encrypt a message with your public key but only you can decrypt these messages with your private key.

    • Encryption
    • Digital Signatures
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#4257

  1. Describe the concept of public and private key with your own words.
    There are public and private keys. Public key is derived from the private key. Public key can encrypt information that only private key can decrypt. Private key can be also used to sign information

  2. What 2 use-cases can public key cryptography be used for?
    Encryption, message is encrypted with public key and decrypted with private key. Digital signature, sender signs information and the sender can be verified with signed information and public key.

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#4258

  1. Describe the concept of public and private key with your own words.
    You will have two keys: A Private and a Public. Your private key is used to encrypt messages and used as your secret identity. However, public key you share with others to transact.

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

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#4259

  1. Describe the concept of public and private key with your own words.
    You generate a private key, then derive public key from it. You can then either:
    a) Receive secret messages somebody encrypts with your public key and read them by using your private key. So you are the only one who can read the secret message
    b) Signing a message with your private key. Anyone can then verify you signed the message by using your public key,

  2. What 2 use-cases can public key cryptography be used for?
    Signing contracts online
    Secure communication on the internet.

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#4260

1 - Public and Private keys are used for the purpose of encrypting and decrypting information over an unsecure or public network so the information isn’t seen or stolen by an unknown.

2 - Two use cases for publics key cryptography are encryption of data and digital signatures.

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#4261

  1. Describe the concept of public and private key with your own words.
    Private key and a Public key are used to transfer data and money in a safe way in the Block Chain technology. Private key is a random number generate by us, which is like our password. Public-key is a number generated from the private key by mathematical functions, is like our account number and is mathematically connected with our Private key number.

  2. What 2 use-cases can public key cryptography be used for?
    Public key cryptography can be used for encryption and digital signature of data or money transfer in the Block Chain technology.

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#4262

  1. Describe the concept of public and private key with your own words.
    A public key does not exist without a private key. It is a pair. Each key can be represented by a number. In encryption the number that allow you to encrypt data is the public key, the number that allow you read the data is the private key from which the public key is derived.
    The public key is generated from the private key. The private key is generated randomly.

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

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#4263
  • Describe the concept of public and private key with your own words.

Public and private keys are the two components of the ways to send sensitive information that you don’t want others to see. Public keys are code that is derived from someone’s private key, while private keys are usually generated randomly. This code can only be discovered from one direction. Private keys are used to find public keys but they can’t be used in the reverse. Private keys can be used to show that someone is who they say they are unless their private key became compromised due to neglect. These private keys can be used to create a digital signature and public keys which allows the sender to send cryptic information and prove they are who they say they are.

  • What 2 use-cases can public key cryptography be used for? Cryptography and Digital Signatures
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#4264

  1. The public key is visible to everyone and used to encrypt data, private keys are secret, only known to you and used to decrypt data

  2. Public key cryptography manages digital risk by providing digital signatures that cannot be reversed and offers increased data security because users do not have to reveal their private keys to anyone, lessening cyber criminal attacks. No secret swapping of keys

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#4265

  1. A public key is a value which is derived from a private key which usually is a random number. The private key belongs to its creator and should be kept secret (ie private). The public key could be placed in a twitter description, a blog or at any public place. The private and public keys are related mathematically and unidirectionally, meaning that the private key could not be derived from the public key.

  2. Public and private key pairs are used for encryption and digital signatures. With encryption, the sender is encrypting the message using the receiver’s public key. Once encrypted, the message may only be decrypted by using the receiver’s private key. With signatures, a message is signed using a private key. The receiver of the message may then use the sender’s public key to verify the signature.

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#4266

The public key is used to encrypt information while the private key is used to decrypt. It can be used to encrypt and for digital signatures.
2021-04-13T23:09:00Z

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