NTA-NET (UGC-NET) Computer Science & Applications (87) Networks, Virtualization, & Cloud Computing-Network Security and Privacy Study Material (Page 6 of 24)
Choose Programs:
⏳ 🎯 Online Tests (4 Tests [100 questions each]): NTA Pattern, Analytics & Explanations
Rs. 800.00 -OR-
3 Year Validity (Multiple Devices)
Sample TestsDetailsSee Demo
🎓 Study Material (2083 Notes): 2024-2025 Syllabus
Rs. 1250.00 -OR-
3 Year Validity (Multiple Devices)
Topic-wise Notes & SampleDetails
🎯 2699 MCQs (& PYQs) with Full Explanations (2024-2025 Exam)
Rs. 600.00 -OR-
3 Year Validity (Multiple Devices)
CoverageDetailsSample Explanation
Help me Choose & Register (Watch Video) Already Subscribed?
Feistel Cipher
Edit
- Block cipher having k bits in key and n bits in a block. So 2k possible transformations not .
- Feistel suggested to use substitution and permutation alternatively to produce ciphertext.
- Substitution: Each plaintext element is replaced by a corresponding element. Replacement is unique.
- Permutation: The order of plaintext element is changed.
Feistel Cipher Suggests Confusion and Diffusion. – to Suppress Statistical Cryptanalysis
Diffusion
- One plaintext digit affects in deriving the value of several ciphertext digit.
- Message
… (64 more equations) …
Subscribe (by clicking here) to view full notes and track progress.
Design of Block Cipher
Edit
Number of Rounds
- More number of rounds, difficult for cryptanalytic attack.
- Even if function F is easy to break, a greater number of rounds make cipher strength high.
Function F Design
- F adds confusion. F must be difficult to evaluate through linear equations.
- F must produce avalanche effect. One-bit change produces change in several b…
… (58 more words) …
Subscribe (by clicking here) to view full notes and track progress.