Homework on Public and Private Keys - Questions

Blockchain and Bitcoin 101
#343

  1. In Encryption - A public key is used to “encrypt” a message that can be “decrypted” using a private key
    In a Digital Signature - a private key is used to generate a public key that can be used to digitally sign transactions and send currency.

  2. Public key cryptography can be used for encryption or be used to create a digital signature.

1 Like
#344

  1. Public key is the encryption of a message or transaction sent between 2 parties. The public key ensures the integrity of the message or transaction. The private key is the decryptor of the encrypted message or transaction.

  2. Public key is used in websites encryption and cryptocurrency transaction addresses.
    Private key is used to login to secured websites and authorize cryptocurrency transactions.

#345

  1. Describe the concept of public and private key with your own words.
    A public key is derived from a private key and are used to (a) use the public key to encrypt a message to (b) the private key to decrypt the message.

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

1 Like
#346

  1. a private key is a randomly generated large number who only i know. The public key is derived from that private key and open to anyone in order to send me data to my wallet(which is basically my private key) or to encrypt messages who only i can encrypt with my private key. The private key is needed to send data from my wallet.

  2. encryption and digital signatures

1 Like
#347

Homework on Public and Private Keys - Questions

  1. Describe the concept of public and private key with your own words.
    The public key is for everyone, i.e. the public and the private key is just for you. You can derive the public key from the private key, but not vice versa!

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

First use case:
Encryption of messages
As the sender you encrypt your message using the public key of the recipient. This message has become encrypted (unreadable) and can only be decrypted using the private key of the recipient. Therefore the recipient has to keep his private key secret! Or otherwise people, who stole the private key can also read the message from the sender using the private key to decrypt it.

Second use case:
Digital signatures
The sender creates a signature using his private key. The recipient can verify that the signature has been signed by the sender using the public key of the sender. Although the recipient does not know the private key of the sender, he can verify with the public key of the sender and the signature, that this signature had been created by a person owning the private key, i.e. the sender.

2 Likes
#348
  1. private key is a randomly generated number by a computer. this private key can generate a public key, which can be shared. there is no way of getting the private key by having the public key.
    2.for the encryption of messages and for digital signatures
1 Like
#349

  1. Public key is like giving the world a secret password to read any information that you broadcast to the world in a secret format. The opposite is also true, because everyone has this public password of yours, any can also then code information using your public password that one you can see.

  2. This can be used to show the world that you are actually the author of a piece of work by signing something with your private key. Someone else can also transmit data to you secretly on an open channel by encrypting something with your public key.

#350

Couldn’t upload the video for this lecture, did my own research

1- Public keys are the keys we share with someone to encrypt a message and private keys are kept secret. Private keys are just for one to keep and not share.

2- 1- digital signature (transaction verification)
2- Encrypton - messages

1 Like
#351

  1. Describe the concept of public and private key with your own words.
    Your computer generates a random number that creates a private key.
    A public key is created from the private key for public use as the private key cannot be ‘guessed’ from the public key.

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

#352

1, -Private key is a random numbers which is generated by computer.
-Public key is a key that is generated from Private key using a hash function so there is no way to go
from public key to private key.
2, Encryption and digital signature.

#353

What do you mean that you couldn’t ‘upload’ the video?

#354
  1. Public key is a random number derived from a private key. creating a pair that work together to send and recieve verified messages.
  2. Two use cases for public key are digital signatures and encryption which allows someone to send secure messages on a open platform. only allowing the owner of a specific private key to unlock the message.
1 Like
#355
  1. A private key is a large alphanumerical sequence randomly generated. In Bitcoin, only the owner of the address can see it. A public key is an alphanumerical sequence that is randomly generated by a private key. In Bitcoin, everyone can see it. It’s a one-way relationship, it’s not feasible to to get the private key from the public key.
  2. You can use public key cryptography for encryption of information (a message for example) or for digital signatures (identification and integrity for example).
1 Like
#356

1, Public key is the key you share with others to send and receive encrypted data. The private key is yours and kept secret. This is used to decrypt the data. Private key also creates a signature to veriify the data that you send from your public key is from you.

  1. Data transfer, bitcoin transactions.
1 Like
#357

A private key is used to create a linked public key that anyone can see on an open network - yet they can never use the public key to figure out the private key.

It can be used as a digital signature and to encrypt a message.

1 Like
#358

I mean, that the page for this lesson didn’t have the video/link to click on to watch the lecture video. My laptop broke and I’m taking these courses on my iPad for now… not sure if accessing through an iPad has anything to do with it?

#359

The public keys can used publicly, put out to any used platform, and trough that you can receive any incoming transactions for your wallet.
The private keys are the only way to access the funds, you received by the public key. It needs to be kept in safe and private.

Encryption to make it more secure, and digital signatures to make it more traceable.

1 Like
#360

1.-I think a Private Key is something that directly identifies you and makes you different from anyone else on a network, lets say society, like your fingerprint or face structure, It was technically randomly created by nature,
and a Public Key is more like an ID card, it could include your fingerprint and photo, everyone can see it or share it, present it like own, but the fingerprint or photo will not match theirs.

2.-Encryption and Digital signature

1 Like
#361

  1. A public key us something that you can freely give out to anyone at no risk, it was traditionally used as a public address, and is derived algorithmically from a private key. A private key is like the password that protects the asset(s) in question.

  2. You can use public key cryptography to verify that a particular person sent you a document, or gives you their permission for something. It can also be used to create cryptocurrency wallet addresses, to transmit digital assets.

1 Like
#362

it shouldn’t be a problem to watch it on an iPad. Maybe ask someone who can help you in your area?

1 Like