Transport_Level_Security in crotography.pptx

good concept

1. Transport-level Security (TLS) Confidentiality | Integrity | Authentication | Forward Secrecy

2. Introduction Protects data in transit between client and server Operates at Transport Layer (Layer 4) Standard: TLS (successor to SSL) Provides secure communication across networks

3. Core Objectives of TLS Confidentiality – Encryption prevents eavesdropping Integrity – Hashing ensures no tampering Authentication – Certificates verify identity Forward Secrecy – Protects past sessions even if keys leak

4. How TLS Works Handshake Phase: Client Hello and Server Hello Digital certificate verification Key exchange (RSA, ECDHE) Session key established Record Phase: Data encrypted with symmetric encryption Integrity ensured with HMAC

5. TLS Versions SSLv2, SSLv3 – obsolete TLS 1.0, 1.1 – deprecated TLS 1.2 – strong, widely used TLS 1.3 – latest, faster, secure, forward secrecy by default

6. Applications of TLS HTTPS – Secure web browsing Secure Email – SMTPS, IMAPS, POP3S VPNs – TLS-based VPNs (e.g., OpenVPN ) VoIP & Messaging – SIP over TLS IoT devices – Secure communication with cloud

7. Advantages of TLS Strong encryption and integrity protection Prevents eavesdropping and impersonation Widely supported and standardized Enables trust via Certificate Authorities TLS 1.3 improves speed and security

8. Limitations of TLS Certificate management overhead Risk of MITM if certificates compromised Initial handshake latency (reduced in TLS 1.3) Dependency on Certificate Authority trust model Requires careful configuration for strong security

9. Real-world Example: HTTPS Browser sends Client Hello Server responds with Server Hello + Certificate TLS handshake establishes session key All communication encrypted Padlock icon shown in browser for secure site