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# Xcode1 (2)

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presentation for math
X code by Hala Alameer
tatmeer24 in makkah

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### Xcode1 (2)

1. 1. Cryptography
2. 2. (P,C,K,E,D) P C K K kek E dk D
3. 3. m ∈ ZZm P = C = K = K , k Zm∈∀x x + k (mod m)≡℮k(x) ∈ K , k Zm∈∀x x - k (mod m)≡dk(x)
4. 4. K=15
5. 5. - - - -
6. 6. -2 3
7. 7. ZHDUHDJUHDWWHDP 4
8. 8. - - --- ---
9. 9. x
10. 10. •n
11. 11. 30
12. 12. 30
13. 13. XO 330
14. 14. 66
15. 15. 1535 30
16. 16. a7-a5b2+a2b5-b7
17. 17. (m2 − 1)(n2 − 1) + 4mn
18. 18. (x2 + x + 1)(x2 + x + 2) – 12
19. 19. (x2 + 3x + 2)(x2 + 7x + 12) – 120
20. 20. •-- • • • • •
21. 21. •-- • • • •
22. 22. •-- • • • • • •
23. 23. •-- • • • • •
24. 24. •-- • • • • •
25. 25. •-- • • • • • •
26. 26. •-- • • • •
27. 27. -- • • • • • • •
28. 28. •-- • • • • • •
29. 29. ∆ > 0 ∆ = 0 ∆ < 0
30. 30. 10A12A 4x2 + ax + 8x + 9 = 0xa
31. 31. |m-2009|=-(n-2010)2(m- n)2011
32. 32. • (1) (2)aa≥0