Homework on Public and Private Keys - Questions

Blockchain and Bitcoin 101
#323

A digital signature is not the same as the private key. A digital signature is an unique signature for
a certain message. (derived from private key + the message)

#324

Thanks for the correction Fabrice

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#325

  1. Describe the concept of public and private key with your own words.
    It is a simple concept, where you generate a random number and then from that random number you generate another number and there is a formula that connects the two numbers.

  2. What 2 use-cases can public key cryptography be used for?
    First case is for encryption. If you want to send a secret message to someone for example, you encrypt your message with the other’s person public key and that way, he is the only one who can decrypt the message using his private key. The other case is for digital signature. This time you sign a document with your private key and then you share your public key to other people so they can verify that it is indeed you, because your private key is the only match for your public key.

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#326

1 Public and private keys are cryptographic tools that are used to encrypt and decrypt a message, a transaction.
Private key is a random number that the computer generates (important to keep it private and safe).
The public key is open to the network.
we use the public key to encrypt a message and the private key to decrypt it.

  1. The cases we use public key in cryptography are encryption and digital signatures.
    In encryption we encrypt a message with the public key of the person who we are sending the message, and only that person is able to decrypt the message by using his private key.
    A digital signature, which is generated by private key, is all about verifying who send the message/transaction.
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#327
  1. A public key in crypto is basically your wallet address ( bank account number ) where someone can send you bitcoin etc . The private key is what enables you access to this account , wallet ,funds etc , a bit like a very long encrypted pin code derived from the public key . If you lose your private key there is no safety net and your funds or information are lost forever .
  2. Public key use cases are for encryption and digital signature , identification .
#328

Actually, your public key is derived from the private key. It al starts with a random private key. With some math (eleptic curve cryptography) ect… you derive public keys and bitcoin addresses

#329

Thank you for help , I’m not quite understanding this section

#330
  1. Private key is key generated from some chars, in real word example of crypto wallet from words in seed phrase. From private key we generate public key using SHA-256 cryptographic function. With private key we can generate public key, but not vice versa. Basically, whole point here is to have encrypted public key witch only “we” know from what is generated.
  2. We can use it for sending encrypted messages and for digital signature
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#331

If you need help, I can do a voice call on discord or something

#332

  1. A private key is your digital fingerprint or signature. It’s a computer generated number assigned to you and only you for your safe-keeping and security. A public key is derived from your private key for the world to see and use. If someone wants to send you an encrypted message or payment they send it using your public key. I would then use my private key to unlock the message or payment.

  2. Two use-cases for public key cryptography are encryption and digital signatures.

#333

Thank you , much appreciated …… I will do some extra reading and you-tubing and if still confused ask for help
many thanks

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#334

  1. Bitcoin uses both to carry out basic functions in a wallet. The private key is the root base of security that also generates the public key. The public key works with the private key to send encrypted and non-encrypted messages to other wallets on an open public network.

  2. A. Used for the encryption of messages/transactions.
    B. Signatures from private keys are then verified by the public key.

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#335
  1. Public key is encrypted from the private key but it is used for the public sending and receiving btc. Private key is secret/private and must never be shared. It is a random number generated by the computer.
  2. 2 use cases for a public key are encryption- a random key the computer generated and digital signatures which is when the the sender signs the message with the private key and the recipient is able to verify the message was sent by the sender with the public key
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#336
  1. Describe the concept of public and private key with your own words.

A private key is a concept in cryptography where a big number that is randomly generated is able to mathematically produce a public key that can be verified as an output of the private key. These also act similar to one way functions in that the public key can be outputted from the private key but not vice versa

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

It can be used to 1. encrypt and 2. authenticate a message or transaction from the sender

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#337
  1. Public key and private key are used in cryptography to encrypt and decrypt messages. Private key is a random number using which a public key is derived. If a person wants to send a message over unsecured network he can encrypt message using a public key published by recipient which is actually derived from the private key. The encrypted message can only be decrypted by the recipient who has the private key. Also it can be used to digitally sign a message.
  2. Encryption and Digital signature are two use cases used.
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#338
  1. A private key is a randomly generated large number from which a public key is generated. The private key is kept secret and used to sign/encrypt messages. The public key is used for authentication(ssh, cryptocurrency, messengers and etc.)

2.Encryption and digital signatures.

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#339

  1. Private key is something I cannot share with others while public key can be shared using blogs, etc. Private key allows me to sign a message that can be then opened by the recipient using my public key.

  2. Cryptocurrency and public key signing

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#340

  1. Public key is generated from private key. Private key is a set of random characters. By knowing your public key it is possible to verify your transactions or messages.

  2. For personal signatures and encrypted messages.

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#341

[quote=“ivan, post:1, topic:8431”]
Homework on Public and Private Keys - Questions

  1. Describe the concept of public and private key with your own words.
    It can be used as a means of communication. A computer generates therefore random numbers. The private key should only be known and kept by yourself, the public key is used to interact with other people.

  2. What 2 use-cases can public key cryptography be used for?
    Encryption: Based on your private key you can generate a public key. This goes one way. Via mathematical formulas the receiver can then decrypt the encrypted message ( because only he has access to the key pair). The sender encrypted the message before and put it in a public network, knowing the receivers public key.

digital signatures: digital signatures are derived from the senders private key. the receiver has only access to the senders public key. In Bitcoin you can generate an address on top of a public key.

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#342

Public keys are the ones others can see to be able to pay you.

Private keys are only for you so that you can spend your crypto

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