If you have a private key but forgot the public key, you can use the "Generate RSA Public Key from Private Key Online" tool on vHelper.pro to recreate the public key. This tool supports key formats such as PKCS8, PKCS1, PuTTY, OpenSSH, XML, and MSBLOB.

To use the tool, follow these steps:

  1. Select the private key file from your device or enter the private key content in the box on the left.
  2. Choose the format of the private key file you have.
  3. Click the "Generate public key from private key" button.
  4. The tool will generate a public key in the right box. You can copy or download this public key to use.

Here are some reasons to use the tool:

  • It is an online tool, so you do not need to install any other software.
  • You do not need to know the command or code to use the tool.
  • The tool is fast and accurate.
  • It is compatible with all browsers.
  • The tool is safe and does not store or collect user data.

What is Public key and Private Key?

RSA (Rivest-Shamir-Adleman) is a widely used public-key encryption algorithm. In RSA, a pair of keys is generated: a public key and a private key. These keys are mathematically related, but information encrypted with one key can only be decrypted with the other key.

  1. Public Key: The public key is meant to be shared with others. It consists of two components: the modulus (typically denoted as "n") and the public exponent (often denoted as "e"). The modulus is a large composite number obtained by multiplying two distinct prime numbers, while the public exponent is a smaller number, usually a prime or small odd integer.

  2. Private Key: The private key is kept secret and should never be shared with anyone. It also consists of two components: the modulus (the same value as the public key's modulus) and the private exponent (typically denoted as "d"). The private exponent is a computed value based on the modulus and other parameters, and it is used for decrypting data that has been encrypted using the corresponding public key.