Public Keyis one of the cornerstones of digital security. It plays a critical role in data encryption and authentication processes. In the two -key encryption system, each user has a pair of keys. One of them is “Public Key”, which is open to everyone, and the other is the “Private Key olan which is hidden.
What is Public Key, what does it do?
Public Key is a mathematical tool used in asymmetric encryption systems. It is open to everyone and is used to encrypt data or verify digital signatures. Private Key if it is only stored in the owner. The data encrypted with Public Key can only be opened with the matching key that matches.
This system offers an ideal structure for safe communication. For example, the credit card information you send to a website is encrypted with the Public Key of the site. Only the site’s private key can solve this information. Thus, the data is protected from third parties.
How does public key work?
Asymmetric encryption is a technology developed in the 1970s. Public and private keys are mathematically interconnected. However, it is almost impossible to derive the other from one. This is explained by the concept of “one -way function ..
Encryption and solving process
With Public Key encrypted data It cannot be read without Private Key. For example, you want to send an encrypted message to Ömer. You encrypt the message using Ömer’s Public Key. Omar opens the message with Private Key. Someone who does not hold Private Key cannot solve the message.
Digital Signature Verification
Public Key, Digital signaturesIt is also used in verification. Private Key comes into play while signing a document. The buyer controls the validity of this signature with Public Key. In this way, the document is not changed and the identity of the sender is proved.
Uses of Public Key
Public Key’s Modern Digital CommunicationIt is used in many areas in. SSL/TLS certificates, e-mail encryption and crypto currency transactions are some of them.
SSL/TLS Certificates
Websites secure connection SSL/TLS certificates are used to provide. The browser gets the public key of the site. Data exchange is encrypted through this switch. The phrase “HTTPS” indicates that this secure connection is active.
Crypto Money Transactions
Bitcoin 
$102,381.3 And Ethereum 
$3,129.8 Crypto currencies such as use Public Key as a wallet address. When sending money to someone, you specify the receiver’s public key as a target address. Private Key is required to confirm the operations.
Public Key and Security Relationship
The security of public keys depends on the protection of Private Key. The fact that Public Key is open to everyone is not a risk. Because Private Key is a must to solve encrypted data.
Importance of Private Key
The stolen or loss of Private Key is a great vulnerability. For example, encrypted data can be deciphered if a server seizes Private Key. For this reason, Private Keys should be stored on hardware -based devices.
Creation process of the key pair
Key pairs Random number generators (RNG). If enough complex algorithm is not used, the switches can be estimated. Therefore, reliable software should be preferred.
What is Public Key infrastructure (PKI)?
Public Key infrastructure (PKI) is the system that enables the management of digital certificates. Certificate Authorities (CA) confirms public keys and sign the certificates. Thus, the reliability of the switches is guaranteed.
Role of Certificate Authorities
CAs confirm the identity of a website and the public key. Scanners in advance the root certificates of CAs. In this way, users can automatically establish a secure connection.
Certificate Cancellation Lists
Sometimes certificates may become invalid. For example, if Private Key is stolen, the certificate is canceled. Scanners prevent canceled certificates. This process prevents users from being damaged.
Responsibility Rejection: The information contained in this article does not contain investment advice. Investors should be aware that crypto currencies carry high volatility and thus risk and carry out their operations in line with their own research.
