Can we extract private key from public key?

You cannot generate private key from public key but you can generate public key from the private key using puttygen. As @alfasin mentioned if you could generate the private key from public key then RSA would be useless and this would make you vulnerable to attack.
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How do I get a private key from a public key Bitcoin?

You can pick your private keys randomly using just a coin, pencil, and paper: toss a coin 256 times and you have the binary digits of a random private key you can use in a bitcoin wallet. The public key can then be generated from the private key.
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Can a public key decrypt a private key message?

Anyone can encrypt a message by using your public key, but only you can read it. When you receive the message, you decrypt it by using your private key. Similarly, you can encrypt a message for anyone else by using their public key, and they decrypt it by using their private key.
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Can you steal a private key?

Private key security may seem simple, but compromised private keys are the most common way in which blockchain accounts are hacked and people lose their cryptocurrency. Avoiding three common mistakes does a lot towards protecting the security of a blockchain account.
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How do you make a public key private key?

How to Create a Public/Private Key Pair
  1. Start the key generation program. ...
  2. Enter the path to the file that will hold the key. ...
  3. Enter a passphrase for using your key. ...
  4. Re-enter the passphrase to confirm it. ...
  5. Check the results. ...
  6. Copy the public key and append the key to the $HOME/.
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Private Key Finders, Private Key Generators, Deriving Private Key from Public Key.



Can a private key have multiple public keys?

When signing just sign with all the private keys, when verifying try to verify one of the signatures. Encryption is the usual operation and decrypting should try to decrypt with all the keys (one of them should work). But in the link given by Rasmus Faber above it appears that you can't have multiple public keys.
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How do I generate a private key from a certificate?

Procedure
  1. Open the command line.
  2. Create a new private key in the PKCS#1 format. openssl genrsa -des3 -out key_name .key key_strength. For example: openssl genrsa -des3 -out private_key. ...
  3. Create a certificate signing request (CSR). The request is associated with your private key and is later transformed into a certificate.
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Can ssh key be stolen?

Therefore, it represents possible stolen credentials. SSH keys are never set to expire, so they can present long-lived access into an environment. They may even be used as a backdoor. Because SSH keys are shared by teams of system administrators, there is sometimes a lack of individual accountability.
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How secure is private key?

The private key is confidential and should only be accessible to the public key pair owner. In this method, whatever is encrypted with the public key requires the related private key for decryption and vice versa. Public key encryption is typically used for securing communication channels, such as email.
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What if someone knows your private key?

If someone has accessed your private key it they have the ability to access any device or encrypted file that was protected with your public key. It also means that they can sign things on your behalf ... it is VERY bad if someone has gained access to your private key.
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How do I decrypt a private key?

To decrypt the private key from the terminal:
  1. Open terminal.
  2. Run the open ssl command to decrypt the file $ openssl rsa -in <encrypted_private.key> -out <decrypted_private.key> Enter pass phrase for encrypted_private.key: <enter the password> writing RSA key.
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Does public key encrypt or decrypt?

In public key cryptography, every public key matches to only one private key. Together, they are used to encrypt and decrypt messages. If you encode a message using a person's public key, they can only decode it using their matching private key.
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What is the strongest type of encryption?

AES 256-bit encryption is the strongest and most robust encryption standard that is commercially available today.
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Where are Bitcoin private keys stored?

Private keys can be stored on computers or mobile phones, USB drives, a specialized hardware wallet, or even a piece of paper. The ideal form of storage will depend on how often you plan to use your cryptocurrency.
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How can I get bitcoins for free?

Methods To Earn Free Bitcoins
  1. Recommended Crypto Exchanges.
  2. Pionex.
  3. CoinSmart.
  4. Crypto.com.
  5. Coinmama.
  6. #1) Tipping Bots And Platforms.
  7. #2) Playing Online And Offline Games.
  8. #3) Mining Browsers And Free Mining Software.
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Does each Bitcoin have a private key?

Every Bitcoin wallet contains one or more private keys, which are saved in the wallet file. The private keys are mathematically related to all Bitcoin addresses generated for the wallet. Because the private key is the "ticket" that allows someone to spend bitcoins, it is important that these are kept secret and safe.
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Can I store private key on server?

Yes, if you use something like Windows Key Store or a password encrypted TLS private key you are exposed to the users that have the password (or access) to the private keys. But, I think you will agree that raises the bar. The file system ACLs (if implemented properly) provide a pretty good level of protection.
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How public private key is stored in database?

You could encrypt the private key with a symmetric key based on the users password. Simply store an additional salt and perform the password "hash" to get a separate key. Then use that as key for encrypting the private key.
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How do I SSH my private key?

How to SSH Using Private Key Linux
  1. Step 1: Install OpenSSH. To create public and private SSH keys, we need to install the OpenSSH package. ...
  2. Step 2: Generate SSH keys. ...
  3. Step 3: Copy Publick Key to Remote Host. ...
  4. Step 4: SSH using Private Key.
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Does PEM contain private key?

pem contains the private encryption key. cert.
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How can I get private key from PEM file?

Generate SSH Keys in PEM Format to Connect to a Public or On-Premises sFTP Server
  1. Verify the key by opening the file in Notepad. The key must start with the following phrase. ...
  2. Use -m PEM with ssh-keygen to generate private keys in PEM format: Copy ssh-keygen -t rsa -m PEM.
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Is a CSR a private key?

Certificate signing requests (CSR) are generated with a pair of keys – a public and private key. Only the public key is sent to a Certificate Authority and included in the SSL certificate, and it works together with your private key to encrypt the connection.
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Are public and private keys unique?

Paired with the public key is a unique, distinct private key. A private key allows a user to decrypt a message that has been secured by their public key. Furthermore, individuals can sign their messages with their unique private key, confirming the sender's identity for the recipient.
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Can I use same private key on multiple wallets?

there can't be multiple wallets from the same private key, you got something wrong. if the contracts of the tokens you are going to send support BatchSend method, this is the one you have to use to save gas. Otherwise, every new transaction will use 20,000 gasd units, thats the overhead for sending the tx.
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Are public keys unique?

No you cannot, but the probability that it is there twice is very, very low. In fact, if two users would have the same public key, they would know the private key, too.
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