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CYBER SECURITY Tutorial
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Public Key Infrastructure (PKI)

Cybersecurity is a critical concern in today’s digital landscape, and the Public Key Infrastructure (PKI) plays a pivotal role in ensuring secure communication over networks. PKI serves as a framework of technologies, policies, and procedures that authenticate the identities of entities in a network environment.

What is PKI?

PKI is a system that enables the secure exchange of data over an insecure network, such as the internet. At its core, PKI uses asymmetric encryption to facilitate secure communication between parties. It involves the use of public and private cryptographic keys to encrypt and decrypt sensitive information.

Components of PKI

1. Certificate Authority (CA)

The Certificate Authority is a trusted entity responsible for issuing digital certificates that validate the ownership of public keys. CAs verify the identity of individuals or organizations requesting certificates, ensuring a secure and reliable system.

2. Digital Certificates

Digital certificates serve as electronic credentials that verify the ownership of a public key. They contain information about the certificate holder and are digitally signed by the CA to ensure their authenticity.

3. Public and Private Keys

PKI uses a pair of cryptographic keys – public and private keys. The public key is shared openly and used to encrypt data, while the private key, kept secret by the owner, decrypts the information encrypted with the corresponding public key.

Importance of PKI in Cyber Security

1. Secure Communication

PKI ensures secure communication by encrypting data with public keys, which can only be decrypted using the corresponding private key. This encryption protects sensitive information from unauthorized access or interception.

2. Authentication and Integrity

Digital certificates issued by CAs validate the authenticity of entities involved in communication. This authentication ensures the integrity of the transmitted data, safeguarding it from tampering or malicious alterations.

3. Non-Repudiation

PKI provides non-repudiation, preventing parties from denying their involvement in a transaction. Digital signatures, created using private keys, serve as proof of the sender’s identity and intent.

Implementation Challenges and Best Practices

While PKI is crucial for secure communication, its implementation comes with challenges. Managing certificates, ensuring key security, and maintaining a reliable infrastructure are among the hurdles. Best practices include regular key rotation, robust encryption algorithms, and continuous monitoring of the PKI infrastructure