Blowfish Algorithm in computer science.pptx

This is full presetation about blowfish algorithm

1. Blowfish Algorithm Made by Boxo

2. Group members Abdusaid Idea(Which algorithm) Baxodir Presentation Sayyora Research

3. Plan History What is it? Encryption End Decryption

4. Let’s Go So

5. History Blowfish is a keyed, symmetric block cipher, designed in 1993 by Bruce Schneier and included in a large number of cipher suites and encryption products.

6. About

7. Understanding

8. The algorithm consists of two parts A key expansion part A Data encryption part 01 02

9. 01 A Key- Expansion part

10. A Key Key expansion converts a key of at most 448 bits into several subkey arrays totaling 4168 bytes.

11. 02 A Data- Encryption Part

12. Encryption 01 Decryption 02

13. 01 Encyption

14. Encryption Algorithm The input is a 64-bit data element, x. Divide x into two 32-bit halves xL, xR For i 1 to 16 xL xL XOR Pi xR F(xL) XOR xR Swap xL and xR Swap xL and xR (Undo the last swap.)

15. Encryption Algorithm(2) xR xR XOR P17 xL xL XOR P18 Recombine xL and xR Function F Divide xL into four eight-bit quarters a, b, c, and d F(xL) ((S1,a S2,b mod 232) XOR S3,c) S4, d mod 232

16. 02 Decryption Algorithm

17. Decryption Algorithm Decryption is exactly the same as encryption, except that P1, P2,..., P18 are used in the reverse order.

18. Cryptanalysis of Blowfish

19. Cryptanalysis of Blowfish In 1996, Serge Vaudenay found a known-plaintext attack requiring 28r 1 known plaintexts to break, where r is the number of rounds. Moreover, he also found a class of weak keys that can be detected and broken by the same attack with only 28+1 known plaint exts. This attack cannot be used against the full 16-round Blowfish

20. Conclusion Encryption helps to protect sensitive information from unauthorized access, theft and other security threats . Encrypting data ensures that even if it falls into the wrong hands, it cannot be easily read or understood. It is an essential step for businesses, organizations and individuals to take to protect their data and maintain their privacy. All we have to use it for our security!

21. Source Google search Google images