Homework on Public and Private Keys - Questions

Blockchain and Bitcoin 101
#3364

  1. Public key is generated by the private key. Every public key matches to only one private key. Together, they are used to encrypt and decrypt messages. These keys help to ensure the security of the exchanged data. A person cannot guess the private key based on knowing the public key. Because of this, a public key can be freely shared. The private key however belongs to only one person.

  2. a. Encryption where the sender encrypts the message with the recipient’s public key and it can only be decrypted by the recipient using their private key.
    b. Digital signatures where your transactions are signed through your private key in order to verify the authenticity of the signature.

1 Like
#3365

  1. The public key is published to everyone. The private key is secret is commonly known by one person or entity. With the public key, everyone can encrypt a message. Only the owner of the private key can decrypt it.

  2. With the public key you can send funds or encrypt messages.

1 Like
#3366

:small_blue_diamond: Public and private keys are used for cryptography. A private key is a randomly generated large number, which then formulates a public key based on the private key. It is also a one-way function from Private to Public. Public keys can be shared with anyone on the network but NOT your private key if you lose that you lose your data (whatever was encrypted) because the only way to decrypt a message is through the private key.

:small_blue_diamond: 2 use-cases public cryptography can be used for:

  1. Encryption - i.e. sending a secured message through a network full of potential spectators.
  2. Digital signatures - how you can identify yourself.
1 Like
#3367

1, Private keys are used to send encrypted messages when a connection is unsecured and open to a lot a potential spectators
2, Encryption to hide a message from one person to another
Digital signature to identify and confirm the integrity of a message

1 Like
#3368

[ 1. Describe the concept of public and private key with your own words - Private key is your personal unique digital signature. Public key is your proxy representing your beacon in the global network.
2. What 2 use-cases can public key cryptography be used for? - encryption and digital signature.

1 Like
#3369

  1. Purpose of private and public key is to encrypt and decrypt. The public key is derived from the private key, but can not expose it. A message can be encryptet with the public key and only be decryptet with the privat key it was derived from.

    Your keys identify you.

  2. Encryption and digital signatures.

1 Like
#3370

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

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

  3. The private key is a random number generated by computer. its imposible to have 2 identical private keys. So from the private key you make a public key who is visible to anyone and used to identify you and transact with you. But it can’t be used to discover your actual private key, steal your identity and transact as you.

2.Encryption and Digital Signatures

1 Like
#3371
  1. Describe the concept of public and private key with your own words.
    A public key is a number that can be freely given out. It is used to encrypt data. The only way to decipher the encryption is using the private key that was used to make the pubic key.
  2. What 2 use-cases can public key cryptography be used for?
    Encryption; Public keys created from private keys i.e. to send/read messages
    Digital Signatures: keys used for identity and integrity. i.e. a signature or to confirm the integrity of a message.
1 Like
#3372
  1. Public and private keys are used together to generate encryption. The public key (i.e. not secret) is derived from the private key (secret, known only to the owner). Data encrypted with the public key can only be deciphered from the private key. The process is linear and uni-directional so that the public key cannot be used to derive the private key. If something is “signed” using the private key, that “signature” is unique to that private key holder and thus public key holders can be assured that the something is from that private key holder.
  2. Public key cryptography is used for encryption, and for digital signatures.
1 Like
#3373
  1. Describe the concept of public and private key with your own words.
    A public key is used to encrypt information so that no one else can read it with out the private key. It is critical to protect your private keys to ensure that your messages are secure.
  2. What 2 use-cases can public key cryptography be used for?
    The public key is used as a digital signature so the receiver can validate the sender.
1 Like
#3374

You only explained one use case. Do you know what is the second one? :wink:

#3375

  1. The private key generates a public key to be used to encrypt data. You need the private key to open the public key.

  2. It can be used to encrypt data such as messages or smart contracts and it can also be used for Financial transactions.

1 Like
#3376

1. Private and public keys are used in Cryptography. Private key is a random set on numbers that are generated by the a software of a program, Private key should be only know by the owner in order to keep privacy and sole ownership of certain accesses. Public keys are random set of numbers generated only by having the private key, it can be available in public forums and social media. by having only the public key, you can not generate its private key as it is a one way function.

2. Public keys are used to send encrypted messages to the owner of that public key, another used case is it use it to verify the identity of the sender by comparing it to the sender’s digital signature.

1 Like
#3377
  1. Describe the concept of public and private key with your own words.

A private key is created by generating a large random number and is never shared with anyone else. A public key is generated from hashing the private key. The public key can be shared with anyone since it is impossible to derive the private key from the public key.

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

Two use-cases for public key cryptography are encryption and digital signatures. Messages can be sent over an open or unsecure network but they can be kept secure by using encryption and digital signatures. Public keys also allow secure peer to peer payments since no one can derive a private key from the public key. Only the owner of the private key can access the funds that were sent to their corresponding public key.

1 Like
#3378
  1. Private keys are large (randomly generated) numbers that are ideally controlled and accessed by a single entity. One way algorithms are used to convert private keys into public keys that can be exposed on the open network and used to verify the origin identity of transactions initiated (signed) by the private key.
  2. Public key cryptography can be used to encrypt data that is sent over an open network using a public key (and allow the recipient to decrypt using their private key), and it can be used to digitally verify the origin of a message through a digital signature applied by a private key and verified by the recipient using the public key.
1 Like
#3379
  1. A public key is used to encrypt a message and can be seen by everyone. It can only be decrypted by the use of a private key. A private key is a random number that is known only to the person who generated it. A public key is derived from a private key but a person cannot guess the private key based on the public key.
  2. Encryption and digital signatures.
1 Like
#3380 
 1. Describe the concept of public and private key with your own words.

A private key is a random number generated by a computer that enables to generate a private key to connect the computer/ wallet to a network.

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

The first case is to encrypt a message. You can receive encrypted messages through your public key and vice versa, and decrypt it with your private key that only you knows.
The second use-case is to sign a message. It can be used to veryfy if the message received, being encrypted or not, was really sent by the prson it says it has been sent from. The sender simply signs the message by adding a link to his public key that can only be generated by his private key with the algorithm.

1 Like
#3381
  1. The public key is used to enrypt sensitive information and the private key decrypts the information that was encrypted with the use of the public key.
  2. The 2 use cases are encryption and digital signatures.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.
1 Like
#3382

1 - Private key is encrypted into a public key. The public key can only be opened if you shared a private key.

2 - Encryption and digital signatures.

2 Likes
#3383
  1. Each wallet is comprised of a private and public key pair.
    Your computer generates a randomized number for your private key and the public key is created from the private key.
    The private key is exactly that, private.
    The public key is public.
    The public key is encrypted and used to send the encrypted information, the private key is used to receive, decrypt that information.
  2. Encryption and digital signatures.
1 Like