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A private key is a large, random number that is kept secret and used to generate another number. That number can be used as a public key which is openly shared.
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Private and public keys can be used to directly encrypt and decrypt messages or to digitally sign and verify public messages(as in Bitcoin).
1. Describe the concept of public and private key with your own words.
The private key was created for me or by me. The private key generates the public key. The combination of private and public key proves that something is mine or that it comes from me. In this case some cryptocurrency.
1. What 2 use-cases can public key cryptography be used for?
- Encryption
- Digital signature
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Describe the concept of public and private key with your own words.
If a user wants to have secure communication in an unsecured network, this can be done using private/public keys. The user (sender of the message) must generate a private key, and using the private key, generate a public key that will be shared with the receivers of the message so they can then decode the messages sent by the sender using the public key. -
What 2 use-cases can public key cryptography be used for?
Encryption & digital signatures
- Private keys are used to create a unique security key. Public keys are derived from the unique private key. Public keys are then shared with others who want to send you (anything?) and you are able to open the (anything) because you have the private key.
- Public key cryptography can be used to send and receive encrypted messages over an unsecured network OR to send and receive $$.
- A private key is a random generated number from that random generated number your public key is generated. They allow you to encrypt anything, but only the holder of the private key will have accuses to the encrypted message.
- It allows you to send encrypted messages and to have digital signatures.
- Describe the concept of public and private key with your own words.
Ensures private communication in public view.
- What 2 use-cases can public key cryptography be used for?
Encryption and digital signatures
- public key is used to encrypt and private key is used to decrypt
- digital identities, digital signage
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A private key is a unique number that is generated by your wallet. From that private key you get a public key that is used by others to send you information / data. In sending data, you use your private key to digitally sign the message to verify that you did, if fact, send it.
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Public Key Cryptography has two use cases, Data encryption and Digital Signatures.
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A public key is a publicly shared set of characters used to receive funds and a private key is a secrete set of characters used to keep your funds safe.
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Cryptography uses public keys to sign digital documents and to encrypt email.
- Describe the concept of public and private key with your own words.
A - A public key is the key you use to share data and the private key is the one you decrypt messages with and keep safe. - What 2 use-cases can public key cryptography be used for?
A - 2 use cases are digital signatures & encryption.
Please does anyone have ācode-snippetsā for what a public and private keys cryptographic-engine looks like?
You can have a look at the Bitcoins source code. It used to be dependant on OpenSSL but have since forked the code into their own source code. Its in the secp256k1
folder.
https://github.com/bitcoin/bitcoin/tree/master/src/secp256k1
- Describe the concept of public and private key with your own words.
Public cryptography is a mechanism that is used for secure communication and identification. A party uses a cryptographic algorithm to compute a large random number, the private key. The algorithm then derives a corresponding public key from this private key. This creates a unique pair of matching keys where only the private key can decrypt data that was encrypted by the public key and vice versa. The owner of the private key must be the only party to have the private key, while the corresponding public key may be shared with anyone (private key cannot be derived from the public key). This enables the holder of the private key and anyone who has a corresponding public key to exchange data securely. This is because a ciphertext generated by a public key can only be converted back to plaintext data using the private key and data that is signed with or encrypted using the private key can only be verified to be authentic or be decrypted by a party who has the public key.
- What 2 use-cases can public key cryptography be used for?
The first use case is encryption. Plaintext data is encrypted using the public key, sent to the owner of the private key who uses the private key to decrypt the ciphertext back into plaintext data.
The second use case is using a digital signature to verify authenticity. The owner of the private key signs the file mathematically using the private key and sends it to someone who holds the corresponding public key. This party then uses the public key to verify the authenticity of the sender (checks for private key signature) and to verify the authenticity of the file (data integrity).
Personally, I still believe that 256 Hash used by Bitcoin and Altcoins is just not secure enough for financial data transaction. There are now Quantum Computers now in the market place that would crack that encryption in a matter of a short time. All this junk I hear in the news that Bitcoin hasnāt being hacked yet is just fake-news, Bitcoin would definitely be hacked soon and maybe then the Satoshi Nakamoto entity would wake up to realize that their Cryptographic Encryption Tunnel is not secure. As I said once again this is a matter of my personal opinion.
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As the name suggests, public keys are open to the public and are required to send, receive and sign data. Private keys however, are used to decrypt the data sent so only the one who possesses this key can access the information within.
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To encrypt and digitally sign data.
- Describe the concept of public and private key with your own words. A private key is a one of a kind code created by your computer and the public key is a code created using the private key and which can then be shared everywhere.
- What 2 use-cases can public key cryptography be used for? Encryption and Digital signatures.
1. Describe the concept of public and private key with your own words.
Private key - generates the public key which can then be shared with everyone else. Unlike the public key, the private key should be kept safe and private as anyone with access to your unique private key will be able to access encrypted messages or spend your cryptocurrencies. The private key is used to send cryptocurrencies such as bitcoin.
Public key - generated from the private key. While you can get a public key from a private key, you cannot find the private key from a public key alone. In the case of bitcoin, the public key is used to receive coins.
2. What 2 use-cases can public key cryptography be used for?
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Encryption - used to send private messages to someone else on an unsecure network.
Letās say April wants to send a secret message to June, but along the way there are spectators who can look at the message as it travels to June. What April can do is to take Juneās public key and āscrambleā it so that it becomes gibberish and the spectators canāt understand it. Once that gibberish reaches June, Juneās private key can āunscrambleā the message back to normal and become readable. -
Digital Signature / Identification - used to sign messages to verify that it really came from the person who claims they sent it.
First, April sends a message (could be unencrypted) and signs it using her private key. Once it reaches June, June compares the signature with Aprilās public key and determines if it corresponds to Aprilās private key. If it does, then it really was April who sent the message.
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The concept of private and public keys is that its a system used to verify the sender of the transaction while simultaneously being encrypted to avoid entities seeing critical information.
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The two cases they can be used for are encryption and digital signatures.
SHA256 has been used as an industry standard for years for all sorts of use cases on the web. Since youāre a cryptography researcher you should know new algorithms are developed all the time to deal with old ones eventually being hacked, which might not even take a quantum computer to do it.
Once it finally happens the network can always hard fork to a new secure algo to remain secure.
- I keep my private key secret but create a signature with it which I use to sign my message. People can verify my authenticity by comparing my signature and public key.
- People will crypte messages they send using my public key and only with my private key, I will be able read them.