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The private key is only for the owner of the key. It’s what keeps information secure. From a private key a public key can be generated and shared to the public. There is only one way communication, that goes from the private key to the public key. In other words, there is no way to determine the private key from having a public key.
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The two use cases from the public key cryptography are:
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Encryption
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Digital Signatures
- Public key is like your mailing address. Private key is the lock that opens your mailbox. You can generate a random private key and then a formula is used to derive the public key from the private key. The public key alone cannot be used to find the private key. However, a private key can be used to decrypt a message that is encrypted by the public key.
- Public keys can be used for encryption and digital signature
Encryption - Sender uses receiver’s public key to encrypt. Receiver then uses their private key to decrypt.
Digital signature - Sender uses their private key to sign their message. Receiver uses the sender’s public key to verify the message. Bitcoin goes one level deeper and uses a bitcoin address to send/receive. Bitcoin address is derived from the public key.
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Your private key is randomly generated just for you, and must always be kept private and secure to access your funds or data. If this key is lost, you will lose access to your coins. If it is stolen, someone can steal your coins or data. The public key is generated from this private key which is what others use to send you funds / data. In Bitcoin, there is an additional step of creating a Bitcoin address from the public key to make it more secure. You can never decipher a private key from a public key, which makes this very secure.
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Encryption - Sending something secretly. Digital Signature - The way in which you identify yourself and the integrity of your ID / signature.
- Describe the concept of public and private key with your own words.
The private key is a random number generated by a computer. From the generated number a second number is generated, this is your public key. This encrypted public key can send messages to other public keys that in turn can be decrypted by the private key of whoever owns that public key.
The private key is proof of ownership and gives access to messages/transaction. The public key is the encrypted data used as a transmitor/receptor available to everyone on the blockchain.
- What 2 use-cases can public key cryptography be used for?
Encryption and digital signatures
- Private key is used to digitally sign a transaction and public key is used to verify the signed transaction. Never share your private key. The private key generate the public key which generate the bitcoin address.
- To encrypt a message and to verify a digitally signed transaction.
1 A private key is me (random number) who I share with no one. A public key is derived from the private key and shared with everyone.
2 The public key is used to encrypt messages to send to someone with a private key to unencrypt. A public key can also help verify a signature is authentic.
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Only private key is the to generate corresponding Public key. Not vice versa. This feature has been used in encryption for a long time. To decrpytion, private key is needed.
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Encryption of message and digital signature
- Describe the concept of public and private key with your own words.
Private key is a random large number that should be kept secret and private. From the private key you can generate the public keys. You can not derive the private key from the public key. Its a one way street. You can also sign data with the private key.
- What 2 use-cases can public key cryptography be used for?
Digital signature and encryption.
We can use a public key to encrypt a message. So if I use your public key to encrypt your message only you (if the private key hasnt been stolen or lost) can decrypt it using your private key.
For digital signature we use the private key to sign a message/data. It is possible to check and figure out mathematically that there is a correlation between a signature and a public key of the same private key.
In that way it is possible to identify that the perso /identity with public key X is the one that signed the data.
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A Public key is generated through an algorithm by using a unique Private key. This Public key can be used by anyone to encrypt sensitive data prior to distribution but only the Private key can unencrypt the data.
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TX RX confidential messages. TX RX monetary value or ownership. Also allows generating verifiable digital signatures as proof of author.
Private key is generated by your computer, and is your personal key, from this a public key is generated from the private key. public key can be shared, private key must be kept secret.
2, Public keys can enable two people to communicate, via public keys that can only be opened be the other persons private key.
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A public key is an address that is shared with everyone. The private key is an address that cannot be seen by anyone except the private key holder. The private key generates a public key which then generates a bitcoin address.
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Public key cryptography is used for encryption and digital signature. With encryption, a message that is sent will remain private. A digital signature allows the sender of a message to be identified.
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Describe the concept of public and private key with your own words.
Public key is for all to see and use and it encrypts the data. Private key is to be kept secret and is the signature. The public key is derived from the private key -
What 2 use-cases can public key cryptography be used for?
Encryption and digital signatures
A public key is an encryption that can be seen publically and the private key is an encryption based on the public key that v=can verify or access the public key but is not publically available.
Thet can be used when making transactions between parties or to encrypt and secure any type of digital information…
1. Describe the concept of public and private key with your own words.
A: a pair of keys (number) with the property that the public key can be derived from the private key but the private key cannot be derived from the public key.
2. What 2 use-cases can public key cryptography be used for?
A: transmission of cryptographically coded messages and messages signatures.
- one person sends a message only meant for one person. that message is encrypted with a private key and when it is received by the person it is meant for it is sent using a public key. Only the signature of the sender is able to mathematically able to calculate opening the message.
2.Encryption: one way function by which the public key(sender) can send the particular message
digital signature: verifies who sent a particular message
Describe the concept of public and private key with your own words.
A private key is unique to a wallet and will allow the holder of those keys access to all funds in that wallet. A public key is simply the destination address that crypto may enter into that wallet.
What 2 use-cases can public key cryptography be used for?
A public key can allow funds to be sent to a wallet holder. A public key can also be used to determine who sent a transaction.
- Describe the concept of public and private key with your own words.
A private key is a number that must be kept secret, because with that number it’s possile to generate a public key, which can be shared publically (many people share their public key in their blog, in their github profile etc.). So, if Bob wants to receive encrypted messages from Alice in an untrusted channel (where everybody can read what goes through), he shares his public key with Alice. Alice can use Bob’s public key to encrypt her messages and only Bob can decrypt them using his private key. Mathematically it’s impossible to derive a private key from a public key and it’s impossible to decrypt a message without having the private key of the receiver of that message.
- What 2 use-cases can public key cryptography be used for?
The 2 major use cases are 1) encryption (which I explained in the above answer) & 2) digital signatures (verify who wrote a message and the integrity of a message). Digital signatures work like this: there is a function to sign a message called e.g. “sign” which takes the sender private key and the message as parameters; the output of that function can be shared with the receiver and used by the receiver with another function called e.g. “verify” that takes the sender public key and the message as input, if the function returns the same result as the result of “sign”, the receiver can tell that the message was not tampered and that it was really sent by the sender, of whom he knows only the public key.
- you have a public and a private key. these are used for sending messeges and transactions.
you use the public key to hide your messages and the private one to reveal them - encrypting crypto, encrypting emails
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Describe the concept of public and private key with your own words.
Private keys are randomly generated and a public key is derived from that. To calculate the private key from the public key is practically impossible. -
What 2 use-cases can public key cryptography be used for?
Encryption: By encrypting a message with someones public key, so that they only can decrypt it with their private key.
Digital signatures: Sign a message with your private key to show that you have send it. Anyone can check this by using your public key.
It is possible to Encrypt AND sign a message by encrypting it with someones public key and sign it with your private key.
- Private keys are a random string of characters generated by my computer/wallet. I can use my private key to generate a public key. This public key is a way for people to recognize that a message or payment was made by me. They see that the public key could only be generated by my private key. A message can be encrypted with a public key and that message can be sent privately then later decoded by my private key.
3.Public key cryptography is used for encryption and digital signatures.