## Can we derive parent’s private key using child’s private key?

## Can two people generate the same private key?

**Yes**. In asymmetric cryptography, key pairs are randomly generated. Furthermore, the amount of different keypairs that can be generated is huge.

## Can I generate my own private key?

Can I Make my Own Private Keys? **Yes, and you do not need a digital wallet to make them**.

## Should you ever share your private key?

**Shared private keys can get lost or stolen in transit or abused**. Plus, there is no way to track who signed what and when if everyone has a local copy of the same signing key. First off, developers may not pass around private keys in the most secure way.

## Can public key and private key be the same?

That’s correct. **In some cases, you could, if you really wanted, make a public key equal the private key**. It would completely negate the benefit of using a public key cryptosystem, though, because access to the public key would imply access to the private key.

## How does a private key get generated?

With asymmetric encryption, both the public and private keys are **generated randomly**. Anyone can have access to a public key to encrypt data, but only an individual who has the matching private key can decrypt the data.

## How extract private key from PEM?

**Procedure**

- Take the file you exported (e.g. certname. …
- Run the following command to export the private key: openssl pkcs12 -in certname.pfx -nocerts -out key.pem -nodes.
- Run the following command to export the certificate: openssl pkcs12 -in certname.pfx -nokeys -out cert.pem.

## Can private keys be shared?

A private key, also known as a secret key, is a variable in cryptography that is used with an algorithm to encrypt and decrypt data. **Secret keys should only be shared with the key’s generator or parties authorized to decrypt the data**.

## How do you distribute a private key?

You have two options for distributing secret encryption keys: you can **electronically mail them to users**, or you can save the key to a file and give the users the file. The easier distribution method is mail.

## Can a security key be used for multiple computers?

**No, your key will work on any computer that has a USB drive**. Carry it with you like a car key. Do I need a separate key for every account? You can use a single key for as many accounts as you like.

## How many private keys are possible?

A private key is a 256-bit number. This means that it is represented in binary in 256 numbers of 0 or 1. In total, this means there are a total of (almost) **2^256** combinations of private keys.

## Can a public key have multiple private keys?

Is there a possibility of having multiple private keys with a single public key? The answer depends on what exactly do you consider as “public key” and “private key”. **If it’s simply e / d for RSA and y / x for DSA, then yes — provided you vary basic parameters p / q / n for RSA and p / q / g for DSA**.

## Can you encrypt with private key?

**Only the owner of the private key can encrypt data so that the public key decrypts it**; meanwhile, anyone can encrypt data with the public key, but only the owner of the private key can decrypt it. Therefore, anyone can send data securely to the private key owner.

## Who holds the private key?

**The private key is kept secret** and not public to anyone apart from the sender and the receiver. The public key is free to use and the private key is kept secret only. The private key mechanism is called “symmetric” because a single key is shared between two parties.

## What if YubiKey is stolen?

If you lose your Yubikey, **you can still use your phone authenticator app, but you cannot create a backup Yubikey**. However, Yubikey also provides methods to recover your account, so you can get a replacement. An advantage to Yubikey is that it comes on a USB that cannot be identified.

## Can you turn a USB into a security key?

To set up a USB security key, **you need a USB drive and a USB security key app**. You install the app on your computer, set it up, and then use it to create your USB security key. Whenever your computer is on, the app constantly scans your USB ports for a device that contains a specific encrypted file.

## Can I use the same SSH key on two computers?

**The same SSH key should be able to be used from multiple clients**. I have different SSH keys for different networks and they’re actually stored on an encrypted USB drive that I use from several different computers without a problem.

## How do I create a private Windows key?

**Generating an SSH Key Pair on Windows Using the PuTTYgen Program**

- Run the PuTTYgen program. …
- Set the Type of key to generate option to SSH-2 RSA.
- In the Number of bits in a generated key box, enter 2048.
- Click Generate to generate a public/private key pair.

## How do I get a BTC private key?

The bitcoin private key is just a number. 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.

## How do I create a private key in Windows 10?

**Generating an SSH key**

- Open the PuTTYgen program.
- For Type of key to generate, select SSH-2 RSA.
- Click the Generate button.
- Move your mouse in the area below the progress bar. …
- Type a passphrase in the Key passphrase field. …
- Click the Save private key button to save the private key.

## How do I create an encrypted private key?

Different ways to generate encrypted private key

**Generate 4096-bit RSA private key, encrypt it using AES-128 cipher and password provided from the specific file**. Generate 4096-bit RSA private key, encrypt it using CAMELLIA-256 cipher and password provided from the environment variable.

## Can public key decrypt private key?

**Only the owner of the private key can encrypt data so that the public key decrypts it**; meanwhile, anyone can encrypt data with the public key, but only the owner of the private key can decrypt it.

## Who is the father of cryptography?

**Claude Shannon**. Claude E. Shannon is considered by many to be the father of mathematical cryptography. Shannon worked for several years at Bell Labs, and during his time there, he produced an article entitled “A mathematical theory of cryptography”.

## How do I generate AES 256 encryption key?

**On the command line, type:**

- For 128-bit key: openssl enc -aes-128-cbc -k secret -P -md sha1.
- For 192-bit key: openssl enc -aes-192-cbc -k secret -P -md sha1.
- For 256-bit key: openssl enc -aes-256-cbc -k secret -P -md sha1. “secret” is a passphrase for generating the key. The output from the command is similar to:

## Can AES 256 be decrypted?

**Only those who have the special key can decrypt it**. AES uses symmetric key encryption, which involves the use of only one secret key to cipher and decipher information.

## How do I get a 128 bit key?

Characters are represented with 8 bits. hence to form 128 bit key, **create a string having 16 chars (16*8=128)**, e.g. “abcdefgh12345678”.

## How are asymmetric keys generated?

Asymmetric algorithms **require the creation of a public key and a private key**. The public key can be made known to anyone, but the coresponding private key must only be known by the decrypting party.

## Why is RSA better than AES?

The key size is therefore easy: **AES-256 has close to 256 bits of security while RSA only offers about 112 bits of security**. In that respect AES-256 has RSA-2048 completely beat. As for the algorithm, AES-256 is considered secure against analysis with quantum computers.

## Is AES symmetric or asymmetric?

symmetric

The Advanced Encryption Standard (AES) is a **symmetric** block cipher chosen by the U.S. government to protect classified information. AES is implemented in software and hardware throughout the world to encrypt sensitive data. It is essential for government computer security, cybersecurity and electronic data protection.

## Is RSA symmetric or asymmetric?

asymmetric algorithm

RSA is named for the MIT scientists (Rivest, Shamir, and Adleman) who first described it in 1977. It is an **asymmetric** algorithm that uses a publicly known key for encryption, but requires a different key, known only to the intended recipient, for decryption.

## Is RSA 1024 secure?

It is said that, currently 1024 bit numbers cannot be factored but, RSA 1024 bit (which is about 310 decimal digits) is **not considered secured enough**. It is advisable to use RSA with 2048 bit or more, if one needs long term security.

## Can RSA be used with AES?

No problem! **You can combine RSA encryption with AES symmetric encryption to achieve the security of RSA with the performance of AES**. This is normally done by generating a temporary, or session, AES key and protecting it with RSA encryption. AES is not the only symmetric encryption method.