Cryptography And Network Security Atul Kahate Ppt ((install)) <REAL ⟶>

: Introduction to modern asymmetric cryptography offering equivalent security to RSA with significantly smaller key sizes. Module 4: Data Integrity and Authentication

Discussion on the rise of electronic fraud, hacking, and viruses. Security Principles:

Data breaches cost organizations millions in losses. Reputation destruction: Slashing consumer trust overnight.

The attacker attempts to alter system resources or affect their operation. These involve data modification, masquerading (spoofing), replay attacks, and Denial of Service (DoS). Defense relies on detection and recovery .

Substitution and Transposition techniques. 3. Symmetric Key Algorithms (Modern Cryptography) cryptography and network security atul kahate ppt

Defensive Measures (Firewalls, IDS, and Antivirus systems).

┌──────────────────┐ │ 64-Bit Block │ └────────┬─────────┘ ▼ ┌────────────────────────┐ │ Initial Permutation(IP)│ └────────────┬───────────┘ ▼ ┌────────────────────────┐ │ 16 Feistel Rounds │◄─── 16 Subkeys └────────────┬───────────┘ ▼ ┌────────────────────────┐ │Inverse Permutation(IP-1)│ └────────────┬───────────┘ ▼ ┌──────────────────┐ │ 64-Bit Ciphertext│ └──────────────────┘ Strength of DES 56-bit keys are vulnerable to brute-force.

Maintaining Confidentiality (encryption), Integrity (hashing), and Availability (uptime).

A simple substitution cipher where letters are shifted a fixed number of positions. Substitution Cipher: Replacing characters with others. Transposition Cipher: Rearranging the order of characters. 3. Modern Cryptographic Algorithms (Block Ciphers) Reputation destruction: Slashing consumer trust overnight

Unlike symmetric key, this uses a pair of keys: a public key (for encryption) and a private key (for decryption).

Confidentiality, Integrity, and Availability.

Executes 16 identical rounds of processing.

Executes substitution and permutation operations repeatedly. Data Encryption Standard (DES) Block size: Processes data in 64-bit plaintext blocks. Key length: Uses a 56-bit effective encryption key. Defense relies on detection and recovery

Before computers, cryptography relied on simple manual techniques:

Eavesdropping or monitoring data transmissions.

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Asymmetric Key Cryptography (RSA & Diffie-Hellman mechanics).

Analyzes changes in pairs of ciphertexts.