INFORMATION SECURITY AND AUDIT
1. Overview of information security
2. Information and Network Security Policies
3. Cryptography and PKI
4. Network security applications
5. Design Principles
6. Compliance, Evaluation system and Law
7. Malicious logic and attacks
8. Vulnerability analysis and IT Audit
9. Intrusion detection and log analysis
LAB WORK -ISA
SOLVED PRACTICE QUESTIONS
PREV NEXT

X.509 

X.509 is a standard that defines the format of public key certificates. These certificates are used in various security protocols to verify the identity of entities and facilitate secure communication over networks. X.509 certificates are integral to public key infrastructure (PKI), ensuring secure authentication, encryption, and data integrity.

Structure of X.509 Certificate:

  1. Version: Indicates the version of the X.509 standard used (e.g., v1, v2, v3).
  2. Serial Number: A unique identifier assigned by the certificate authority (CA).
  3. Signature Algorithm: The algorithm used by the CA to sign the certificate.
  4. Issuer: The entity that issued the certificate (usually a CA).
  5. Validity Period: Specifies the start and end dates during which the certificate is valid.
  6. Subject: The entity the certificate is issued to (e.g., a person, organization, or device).
  7. Subject Public Key Information: Contains the public key and the algorithm associated with it.
  8. Extensions (optional): Additional information and attributes, such as key usage, alternative names, and certificate policies.
  9. Signature: The digital signature of the CA, verifying the certificate's authenticity.

 

Functions of X.509 Certificates:

  1. Authentication:
    • X.509 certificates authenticate the identity of entities (e.g., users, servers, devices) in a network. When an entity presents its certificate, the recipient can verify its identity by checking the certificate's digital signature against the issuer's public key.
  2. Encryption:
    • Certificates facilitate the exchange of public keys, enabling entities to encrypt data securely. The recipient's public key is used to encrypt data, which can only be decrypted by the corresponding private key.
  3. Data Integrity:
    • Digital signatures ensure that data has not been tampered with during transit. The sender signs the data with their private key, and the recipient verifies the signature using the sender's public key contained in the X.509 certificate.
  4. Secure Communication:
    • X.509 certificates are used in secure communication protocols such as SSL/TLS, ensuring encrypted and authenticated connections between clients and servers.
PREV NEXT