Public and private key are the two things that are necessary for either encryption or digital signatures. The public key is visible to anybody that can access the systems data while the private key is held by individual users and should be maintain secretly.
The main uses for public and private keys are encryption and digital signatures.
Digital signatures and encryption are the two usecases. Sending digital assets mostly use digital signatures. 
You can also use them for digital signatures which is the feature cryptocurrencies rely on.
1.The concept of public and private key is idealized that a piece of code generated in asymmetric-key encryption process, paired with a public key, to be used in decrypting information hashed with the public key.https://coinmarketcap.com/alexandria/glossary/private-key-secret-key
2. Also known as asymmetric encryption, public key cryptography is used as a method of assuring the confidentiality, authenticity and non-repudiation of electronic communications and data storage. Public-key encryption uses two different keys at once, a combination of a private key and a public key. The private key must remain confidential to its respective owner, while the public key is made available to everyone via a publicly accessible repository or directory. To decode an encrypted message, a computer must use the public key, provided by the originating computer, and its own private key. Although a message sent from one computer to another wonât be secure since the public key used for encryption is published and available to anyone, anyone who picks it up canât read it without the private key.
a private key is generated by the comp, then the private key creates a public key that is attached to the private key. These key act together
sending info and addresses for BTC
Private and Public keys are a concept of cryptography that is used for encryption and digital signatures. Private keys should be kept secret, while public keys are publicly shown to everyone.
Public keys can be used to generate bitcoin addresses, and to encrypt messages.
A private key is visible only to itâs owner or wallet. This private key is then used to generate a public key which is visible to all. When sending a message or bitcoin to someone else, the sender adds a signature to the message, which is based on the private key. The recipient of the message is able to read the signature and compare it against the senderâs public key to verify that message really came from the sender.
The two use-cases for public key cryptography are sending messages, and sending bitcoin from one user to another.
A private key is encrypted and secured while a public key is available to the public. The public key allows Alice to send Bob a message or transaction that is encrypted through the private key. In Bitcoin the Private key generates the public key and the public key creates the bitcoin address. This is a one way function as the public key cant not reveal the private key.
Private and public keys can be used for both Encryption and Digital Signatures. In Bitcoin it is digital signatures that verify the transactions.
You are only mentioning encryption. You can also use them for digital signatures which cryptocurrencies heavily rely on.
Addresses are basically just hashes of public keys. And Iâm guessing you meant encryption with sending info. So the other use case would be digital signatures that cryptocurrencies use.
Describe the concept of public and private key with your own words.
Private key is personal and confidential. Itâs use to sign message or to decrypted information
Public key are visible to anyone and are used to send message/transaction or to encrypte information
What 2 use-cases can public key cryptography be used for ?
Encryption and signatures
Private key is random number that must be kept private. Public key is generated from private key and is shared publicly.
Cryptography can be used for encrypting messages, or for making digital signatures.
Encryption:
Sender uses receivers public key to encrypt his to message to him. Receiver is the only one who can read it, because only he can decrypt the message, using his private key.
Digital signature:
Digital signature proofs senders identity and is not neccessary encrypted. Sender uses his private key to sign the message, so receiver knows who sender is, because signed message and senders public key correlate.
1- a private key is a random and unique number generated by your computer. It then gets encrypted by a methematical formula to generate a public key used by you (the user) to do transactions and verifications. Peoplr canât figure out your private key by knowing your public key.
2- Encryptions and digital signatures.
Homework on Public and Private Keys - Questions
1. Describe the concept of public and private key with your own words.
A private key is a big, random number generated by an issuer, which can be used to encrypt or sign messages. Only the entities that has access to the private key may act on behalf of the issuer, so, if a third party get access to the key, it will be able to sign and decrypt messages as it were the issuer, and, if the issuer loses access to the private key, he or she wonât be able to their resources.
A public key is another number, which is generated by a function using the private key as input, that is designed to be shared with anybody the issuer wants (for instance, the issuer may share it in social media so everyone has access to it, or with a more restricted group of users to allow them to communicate to an API, a private channel, a repository, etc). The public key is used by third parties to communicate with the issuer in a secure environment. It allows anyone to validate if a message was sent by the issuer, in the use case of digital signing, and also allows to encrypt messages that are going to be sent to the issuer.
2. What 2 use-cases can public key cryptography be used for?
Public key cryptography is used for encryption and digital signatures, being the latter the use case bitcoin applies.
Homework on Public and Private Keys - Questions
Describe the concept of public and private key with your own words.
A public key is one that everyone can see but only you can encode or decode based on your own personal private key, and the private key is one that you use to encode the data or information which will then give you the public key.
What 2 use-cases can public key cryptography be used for?
They are useful for both encryption of data/information as well as digital signatures like what is used with a bitcoin wallet.
A private key is a large random number. A public key is a hash output of a private key. You can decode anything encrypted with a public key, only with its private key. You cannot determine what a private key is from the public key, but you can determine if a public key was derived from if you have the private key.
Public key cryptography can be used to encrypt messages and verifiable digital signatures.
A private key is series of number that can identify a wallet, a person or any items. A public key is a series of number accessible to the whole public, that is derived from the private key, in a way that the public key cannot be used to determine the private key.
Public key cryptography can be used to send encrypted messages, it can also be used to generate digital signatures.
Homework on Public and Private Keys - Questions
A public key is generated from its private key through a formula. A public key is visible to all entities on the transmission. However, this public key is worthless to those without the private key to unlock the encrypted message. A private key is the most important key and is a randomly created # by your PC.
Encryption and Digital Signatures. Sending messages or sending funds.