What is Public Key? Public Key Explained.

Last Updated on October 23, 2023

A Public Key is one half of a pair of cryptographic keys used in public key cryptography, also known as asymmetric cryptography. The other half is the private key. While the private key is kept secret, the public key is openly shared and used to encrypt data. Only the corresponding private key can decrypt data encrypted with the public key. Similarly, a signature generated using a private key can be verified by anyone who has the corresponding public key, proving that the signature was created by the holder of the private key and ensuring data integrity.


What is the primary purpose of a Public Key?

The main function of a public key is to encrypt data and verify digital signatures. When someone wants to send secure information, they encrypt it with the recipient’s public key. Only the recipient, who possesses the corresponding private key, can then decrypt and access that information.

How is a Public Key different from a Private Key?

A public key is meant to be shared openly and is used to encrypt data or verify digital signatures. In contrast, a private key must remain confidential and is used to decrypt data or create digital signatures. Losing control of your private key can compromise your encrypted data and digital identity.

Can I share my Public Key without any risks?

Yes, public keys are designed to be shared openly without compromising security. However, it’s essential never to share the corresponding private key, as it should remain confidential.

How are Public Keys used in cryptocurrencies?

In the context of cryptocurrencies, like Bitcoin, public keys are used to create addresses where funds can be received. When someone sends you cryptocurrency, they send it to your public address, derived from your public key. To spend or transfer the received funds, the owner must prove their ownership by signing the transaction with the corresponding private key.

Is it possible to deduce the Private Key from its corresponding Public Key?

With current cryptographic standards and techniques, it’s computationally infeasible to deduce the private key from its corresponding public key. This asymmetry ensures the security of the encryption and the integrity of digital signatures.

Author of This Article:

Rahul Bhatia

Rahul Bhatia

Rahul Bhatia

Rahul Bhatia

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