- Public and private keys are used to send transactions or messages that are secure and private. A private key is a randomly generated number which can generate a public key. The public key is visible to anyone where is the private key is not visible to anyone other than the owner of the private key. A private key can determine a public key but never vice versa.
- Encryption and digital signatures
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Describe the concept of public and private key with your own words.
The public key is computated from the private key and its possible and easy to decrypt messages with the public key which were encrypted with the private key. But it is not possible to compute the private key from the public key. -
What 2 use-cases can public key cryptography be used for?
One can encrypt a message with the public key of someone but only the one with the private key can decrypt it.
But for digital signatures used by blockchain only the second use-case is relevant. A message is encrypted with the private key and everyone with the corresponding public key can verify that message without a lot of computation.
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1: Public key is generated from the private key. Public key is made public and available for everyone to see and it is used in order to encrypt messages. Private key is kept secret and is not shared with anyone and it is used in order to decrypt messages which are sent through the public key.
2: public key cryptography is used for two main cases namely: (a) Encryption
(b) Digital signatures
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creates a private string of alphanumeric characters which generates a key from the private string, called a public key, that is used to encrypt data only the private key can unlock
Sending and receiving private messages or bitcoin.
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Public key is used to encrypt massages or transaction before sending to the receivers address, and it can also be shared to others for the sake of receiving encrypted information from them as well.
Private key is used to decrypt massages or transactions. It is stored only in the owners device and can not be shared with anyone. -
Use cases : a)Used to generate digital signature by private.
b) Use to verify the transaction or massage was performed by the sender through the public key of the sender.
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This is both part of the digital signature process. The other use case would be encryption. 
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- A private key is a randomly generated number. Very large. For your own use. Must be kept safe and private.
A Public key is derived using a formula to convert the Private key into a public one. You can’t go back the other way, mathematically it is impossible to work out a private key given a public key.
- Use case 1. Encryption of messages. Messages are sent thru a unsecured, open network or in a public forum. Message is encrypted by the public key of the receiver and send via the network. The message is unreadable. The only key that can open the message is the private key of the receiver.
Use case 2. Digital signatures. Used in crypto. Used to Identify yourself and ensure the integrity of a particular message and who sent it. Sender generates a private key. Then a public key is derived from it. Sender sends the message signing it with their private key. The receiver uses the public key to verify that the private key attached to the message was that of the sender. A bitcoin address is created from a public key. Transactions are sent to a bitcoin address.
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- My private key is a randomly generated number that only I know while the public key is for everyone to see. The public key is derived from the private key and it’s a one-way function. The public key is used to encrypt a message and the private key then decrypts the encrypted message.
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- encryption 2) Digital signatures for identity integrity
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1.A public key is created from the private key to verify the validity of a transaction or message. The public key is decrypted by the private key.
2. Encryption and Digital signatures
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1.) A public key is used for encryption of data and a private key is used to decrypt data using the public key
2.) public key cryptography is used for encryption of data and digital signatures
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- The private key is a randomly generated large number. You need to keep it safe and secret. The public key is generated from the private key.
- It can be used to encrypt a message. It can also be used as a digital signature for verification.
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Public and Private keys allow users to send and receive encrypted data over a public network. The private key should never be shared, lest you want people to have access to your data (crypto), and the public key is derived from the private key for people to use; the private key can authenticate the public key and decrypt the data.
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It can be used for encryption and digital signatures.
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The private key is the unique number generated that is your own secret number generated by the algorithm.
The public key is the public number generated from the private key.
The uses are for encryption and creating a digital signature
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Question #1: Describe the concept of public and private key with your own words.
Public Key is derived from your private key and it is something that you can provide to others to receive Bitcoins from others, the public key is as the name suggests public, so others can see it, but it will not let anyone figure out what your private key is.
Private key is private and it’s your very own key to access your wallet to send and receive funds, if you loose your private key you’re toast.
Question #2: 1. What 2 use-cases can public key cryptography be used for?
- Encryption to send message in a private way through an open network, unsecure network, public forum – for that we use encryption.
- Digital signatures – how can you identify yourself?
Also how can you ensure integrity of the particular message? How can you be sure that “I” sent it?
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Describe the concept of the public and private key with your own words.
A private key is a random number that is generated by a system, which is known to the owner only.
A public key is computed using a private key, which is disseminated widely. -
What 2 use-cases can public-key cryptography be used for?
Public key cryptography is a system that uses a pair of keys, public, and private keys.
Encryption: Sender encrypts the data using the receiver’s public key, then receiver decrypts the data using his own private key.
Digital Signatures: This is basically used to verify the sender. Here sender signs the message using his private key. Then the receiver uses the signature along with the public key of the sender to verify the sender.
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Public and private keys are random numbers that can be used for 2 things: (1) encryption and decryption; (2) digital signatures. In (1) the message is encrypted with the receivers public key and decrypted with the receivers private key. In (2) the message is signed with the senders private key and verified with the senders public key.
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Encryption and digital signatures.
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- Describe the concept of public and private key with your own words.
Private key is generated by computer. It is a random number that should be only known by you. Public key is generated from a private key and it is open for public.
- What 2 use-cases can public key cryptography be used for?
Encryption and digital signature.
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- Describe the concept of public and private key with your own words.
A public and a private key are forming a pair to perform the functions mentioned under 2.
(Encrypting messages and deciphering them works like this: In order to receive secret messages, one generates a very large random number, a private key, that is to be kept secret. Then, through a special function, one generates a public key from the private key. The public key can be shared with everybody, because a reversal is not possible. Somebody else can now send messages to the person, encrypted by the public key. The person can read them by applying the private key. / A private key can be used to create a signature for a message asserting the identity of the sender. The public key that was generated from the private key, together with the signature, serves to verify the identity of the sender.)
- What 2 use-cases can public key cryptography be used for?
I. Encrypting messages.
II. Identifying oneself and mathematically asserting that one sent a specific message (“digital signatures”), also used in Bitcoin transactions.
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private key is used to keep your wallet encrypted and to send to transactions/messages to a public key were the precipitant will use there private key to decrypt the message
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sending and receiving transactions, digital signatures or private messages
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- The public key is a derivative from you private key. And you can not go the other way. Nobody can
find out your private key with the public key. So this is how you can send encrypted information. - Encryption and digital signatures
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