Cryptography And Network Security Atul Kahate Ppt ((full)) Jun 2026

: Ensuring systems and data are available to users when needed.

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Transmits ciphertext across untrusted networks. Opponent interceptor: Attempts to capture or alter data.

The primary flaw of symmetric cryptography is key distribution: How do you securely share a secret key over an insecure network? Asymmetric cryptography solves this by using a pair of mathematically linked keys: a (shared openly) and a Private Key (kept secret).

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Delivers data privacy along with payload authentication. Transport mode: Encrypts only packet payload data fields.

: The role of Certificate Authorities (CAs), Registration Authorities, and Digital Certificates (X.509 standard).

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Symmetric key cryptography uses the same key for both encryption and decryption. This section is usually heavily detailed in presentations. : Ensuring systems and data are available to

Accepts messages of any arbitrary bit length. Fixed output: Produces a small, fixed-size hash value.

Security is not just about keeping secrets; it is also about proving identity and ensuring that data has not been tampered with during transit. Cryptographic Hash Functions

Broken RC4 stream cipher implementations failed. WPA upgrades: Introduced TKIP to rotate keys dynamically.

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A MAC uses a secret key combined with a hash function to authenticate the source of a message and guarantee its integrity. (Hash-based MAC) is specifically explored as a robust implementation utilizing cryptographic hash functions. Digital Signatures

Calculate d to satisfy (d * e) mod phi(n) = 1. Encryption formula: Ciphertext C = M^e mod n. Decryption formula: Plaintext M = C^d mod n. Key Management