Introduction-Securing-Data-Communication.pptx

Introduction-Securing-Data-Communication.pptx

• 1.
  Introduction: Securing Data Communication Securingdata transmission is critical in today's digital world. This presentation covers digital signatures and hash functions. Examples include e-commerce, legal documents, and software distribution. KS by Khalid Shafaq
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  Data Communication Fundamentals Data Model Sendertransmits data through a channel to receiver. Risks • Eavesdropping • Data tampering • Spoofing attacks Security Goals • Confidentiality • Integrity • Authentication • Non-repudiation
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  Cryptography Basics Symmetric Cryptography Same keyencrypts and decrypts data. Asymmetric Cryptography Uses public and private key pairs for encryption. Public Key Infrastructure Manages keys and digital certificates for trust. Key Details • 2048-bit RSA for encryption • 256-bit AES for data
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  Digital Signatures: Concept andPurpose What They Are Electronic equivalent of handwritten signatures. Security Functions Ensure message authentication and integrity. Non-repudiation Sender cannot deny sending the message.
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  Digital Signature Creation •Message is hashed into a digest. • Digest encrypted with sender's private key. • Signature appended to original message. The combination ensures message authenticity and integrity.
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  Digital Signature Verification DecryptSignature Using sender’s public key to retrieve hash. Hash Received Message Create new hash from received data. Compare Hashes Match confirms authenticity; mismatch indicates tampering.
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  Hash Functions: CorePrinciples One-way Irreversible calculation process. Deterministic Same input gives same output. Collision-resistant Hard to find two inputs with same hash. Common Algorithms • SHA-256 • SHA-3 • MD5 (legacy)
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  Hash Functions: Applications DataIntegrity Detect any changes in files or messages. Password Storage Securely store user passwords with hashes. Message Authentication Codes Combine hashing with symmetric keys for authentication.
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  Real-World Examples Secure Email UseS/MIME and PGP to sign emails digitally. Software Distribution Verify authenticity with digital signatures. Blockchain Use hash functions to ensure block integrity and link blocks.
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  Conclusion: Enhancing Trust inDigital Communication 1 Essential Tools Digital signatures and hash functions secure communications. 2 Benefits Improve security, trust, and legal validity. 3 Future Trends Quantum-resistant cryptography and advanced signatures emerging.