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Основы информационной безопасности. Учебное пособие

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ɉɪɢɦɟɪ 3 ɇɚɨɫɧɨɜɚɧɢɢɉɪɢɦɟɪɚ
(
2346, 646
)
=2ή17 = 34.
ɇɟɞɨɫɬɚɬɨɤ ɷɬɨɝɨ ɫɩɨɫɨɛɚ ɫɨɫɬɨɢɬ ɜ ɧɟɨɛɯɨɞɢɦɨɫɬɢ ɩɪɟɞɜɚɪɢɬɟɥɶɧɨɝɨ ɬɪɭɞɨɺɦɤɨɝɨɤɚɧɨɧɢɱɟɫɤɨɝɨɪɚɡɥɨɠɟɧɢɹ
ɛɜɵɱɢɫɥɟɧɢɟɇɈȾɩɨ ɚɥɝɨɪɢɬɦɭȿɜɤɥɢɞɚɉɨɫɥɟɞɧɢɣɧɟɧɭɥɟɜɨɣɨɫɬɚ ɬɨɤɞɚɫɬɇɈȾ
ɉɪɢɦɟɪ 4 ȼɵɱɢɫɥɢɬɶɇɈȾɞɥɹɬɟɯɠɟɱɢɫɟɥɱɬɨɢɜɉɪɢɦɟɪɟ
  2   2
0
  1   1
68
34
   3
  1
238

408
Ⱦɟɥɢɬɟɥɢɜɫɹɤɢɣɪɚɡɫɬɚɧɨɜɹɬɫɹɞɟɥɢɦɵɦɢɚɨɫɬɚɬɤɢ– ɞɟɥɢɬɟɥɹɦɢȾɨɤɚ ɡɵɜɚɟɬɫɹɱɬɨɚɥɝɨɪɢɬɦȿɜɤɥɢɞɚɜɫɟɝɞɚɤɨɧɟɱɟɧ
Ɉɫɬɚɬɤɢɜɵɞɟɥɟɧɵ ɠɢɪɧɵɦ ɲɪɢɮɬɨɦ ɉɨɫɥɟɞɧɢɣɧɟɧɭɥɟɜɨɣɨɫɬɚɬɨɤ ɪɚ ɜɟɧɷɬɨɢɟɫɬɶɇɈȾ(2346, 646) ɫɪɫɉɪɢɦɟɪɨɦ
ɋɦɵɫɥ ɜɵɞɟɥɟɧɢɹ ɱɚɫɬɧɵɯ ɤɭɪɫɢɜɨɦ ɜɵɹɫɧɢɬɫɹ ɧɢɠɟ ɩɪɢ ɪɚɫɫɦɨɬɪɟɧɢɢ ɰɟɩɧɵɯɞɪɨɛɟɣ
ȼɵɱɢɫɥɟɧɢɟɇɈɄ
[
ɚ©ɲɤɨɥɶɧɵɣªɫɩɨɫɨɛɞɥɹɜɵɱɢɫɥɟɧɢɹ
]
ܽ, ܾ
ɫɨɫɬɚɜɢɬɶɤɚɧɨɧɢɱɟɫɤɨɟɪɚɡ
ɥɨɠɟɧɢɟɤɚɠɞɨɝɨɢɡɱɢɫɟɥɚɡɚɬɟɦɢɡɨɛɨɢɯɪɚɡɥɨɠɟɧɢɣɜɡɹɬɶɩɪɨɫɬɵɟɦɧɨɠɢ ɬɟɥɢɩɪɢɫɭɬɫɬɜɭɸɳɢɟɯɨɬɹɛɵɜɨɞɧɨɦɪɚɡɥɨɠɟɧɢɢ– ɜɧɚɢɛɨɥɶɲɢɯ ɫɬɟɩɟɧɹɯ
ɉɪɢɦɟɪ 5 ɇɚɨɫɧɨɜɚɧɢɢɉɪɢɦɟɪɚ
[
2346, 646
]
=2ή3 ή17 ή19 ή23 = 44574.
Ɇɨɠɧɨɫɞɟɥɚɬɶɩɪɨɜɟɪɤɭɧɚɨɫɧɨɜɚɧɢɢ-ɝɨɫɜɨɣɫɬɜɚɇɈȾɢɇɈɄ
(
ܽ, ܾ)[ܽ, ܾ]= ܾܽ34 ή44574 = 2346 ή646.

ɛɜɵɱɢɫɥɟɧɢɟɇɈɄɱɟɪɟɡɩɨɫɪɟɞɫɬɜɨɇɈȾɫɩɨɦɨɳɶɸɚɥɝɨɪɢɬɦɚȿɜɤɥɢɞɚ ɤɫɨɠɚɥɟɧɢɸɧɟɩɨɫɪɟɞɫɬɜɟɧɧɨɞɥɹɇɈɄɧɟɬ ɚɥɝɨɪɢɬɦɚɜɵɱɢɫɥɟɧɢɹɫɨɩɨɫɬɚ ɜɢɦɨɝɨɫɚɥɝɨɪɢɬɦɨɦȿɜɤɥɢɞɚ
[
ܽ, ܾ
ܾܽ
]
=
(
ܽ, ܾ
.
)
Ⱦɨɩɨɥɧɢɬɟɥɶɧɵɟɩɪɢɦɟɪɵ
ɉɪɢɦɟɪ 6 (161, 3)=1 ɬɚɤɱɬɨɷɬɢɱɢɫɥɚɹɜɥɹɸɬɫɹɜɡɚɢɦɧɨɩɪɨɫɬɵɦɢ
   53
2 1 2 2 2
0
2
ɉɪɢɦɟɪ (33, 13)=1 ɜɡɚɢɦɧɨɩɪɨɫɬɵɟɱɢɫɥɚ
   2    1 1
6
6 0
ɉɪɢɦɟɪ 8 (17, 29)=1 ɜɡɚɢɦɧɨɩɪɨɫɬɵɟɱɢɫɥɚ
  0 0   1   1   2 5 2 2 2  2 2  0


5

ɉɪɢɦɟɪ 9 (40, 23)=1 ɜɡɚɢɦɧɨɩɪɨɫɬɵɟɱɢɫɥɚ
   1   1   2 5 1 5  5 5 0
ɉɪɢɦɟɪ (87, 55)=1 ɜɡɚɢɦɧɨɩɪɨɫɬɵɟɱɢɫɥɚ
 55 55 1 55  1   1   2 5 5 1 5 4 1  4 0
6
5

23
9
32

ɉɪɢɦɟɪ (589, 343)=1 ɜɡɚɢɦɧɨɩɪɨɫɬɵɟɱɢɫɥɚ
   1   1   2  52 1 52  1   6  3 2 3 0
ɉɪɢɦɟɪ (1403, 1058)=23
   1   3   15
0
ɉɪɢɦɟɪ (1672, 1232)=88
   1   2   1 
352
88
 4
0

52
45
345
23
440
246

ɉɪɢɦɟɪ (132, 21)=3
ɉɪɢɦɟɪ (8211, 135)=3
  2
0
  3
3
   6
6
ɋɪɚɜɧɟɧɢɹɩɨɦɨɞɭɥɸ
ȼɵɫɤɚɡɵɜɚɧɢɟ©a ɫɪɚɜɧɢɦɨɫb ɩɨɦɨɞɭɥɸmª
ܽؠܾ(mod ݉
(
ɨɡɧɚɱɚɟɬɱɬɨɪɚɡɧɨɫɬɶ
௔ି௕
Ɍɨɝɞɚ
= ݇אԺ ܽ = ܾ + ݉݇
௠
)
ܽെܾ
ɞɟɥɢɬɫɹɛɟɡɨɫɬɚɬɤɚɧɚm
(
ܽെܾ)ڭ݉
)

ɋɜɨɣɫɬɜɚɫɪɚɜɧɟɧɢɣ ɚܽؠܾ(mod ݉)ؠ(ܽ+ ݉݇)(mod ݉)ؠ(ܾ+ ݉݇)(mod ݉), ݇אԺ . ɂɬɚɤ
ɤɥɸɛɨɣɱɚɫɬɢɫɪɚɜɧɟɧɢɹɦɨɠɧɨɰɟɥɨɟɱɢɫɥɨɪɚɡɩɪɢɛɚɜɢɬɶɦɨɞɭɥɶɫɪɚɜɧɟɧɢɹ
ɛȿɫɥɢܽؠܾ(mod ݉) ɢܿؠ݀(mod ݉
)
ɬɨ
ܽήܿؠܾή݀(mod ݉
)
ɬ ɟɫɪɚɜɧɟɧɢɹɩɨɨɞɧɨɦɭ ɦɨɞɭɥɸɦɨɠɧɨɩɟɪɟɦɧɨɠɚɬɶ
ɋɥɟɞɫɬɜɢɟɨɬɫɸɞɚ
௡ؠܾ௡
ɜȿɫɥɢ ܽؠܾ(mod ݉)ɬɨܽ
ɉɪɢɦɟɪ  21 ؠ 7
(
mod 2
)
ɬ ɤɪɚɡɧɨɫɬɶ21 െ7=14ڭ 2.
(
mod ݉)݊אԺ
ɐɟɩɧɵɟɧɟɩɪɟɪɵɜɧɵɟɞɪɨɛɢ
ɇɚɱɧɺɦɫɩɪɢɦɟɪɚɩɪɟɨɛɪɚɡɨɜɚɧɢɹɩɪɨɫɬɨɣɞɪɨɛɢ ɉɪɢɦɟɪ 
25
7
=3+
4
=3+
7
1
=3+
଻ ସ
1
1+
=3+
ଷ ସ
1
1+
=3+
ଵ
ర య
1+
1
=[3; 1, 1, 3].
ଵ
భ
ଵା
య
ɉɨɥɭɱɟɧɚɰɟɩɧɚɹɞɪɨɛɶɡɚɩɢɫɚɧɧɚɹɫɧɚɱɚɥɚɜɪɚɡɜɺɪɧɭɬɨɦɚɡɚɬɟɦ– ɜɫɨ
ɤɪɚɳɺɧɧɨɦɜɢɞɟ
ɗɬɨɬɩɪɢɦɟɪɢɥɥɸɫɬɪɢɪɭɟɬ ɬɟɨɪ ɟɦɭ ɨɫɭɳɟɫɬɜɨɜɚɧɢɢɟɞɢɧɫɬɜɟɧɧɨɣɤɨ
ɧɟɱɧɨɣ ɰɟɩɧɨɣɞɪɨɛɢɜɤɨɬɨɪɭɸɪɚɫɤɥɚɞɵɜɚɟɬɫɹɥɸɛɨɟɪɚɰɢɨɧɚɥɶɧɨɟ ɱɢɫɥɨ
ɉɪɢɦɟɪ Ɋɚɡɥɨɠɢɦ ɢɪɪɚɰɢɨɧɚɥɶɧɨɟ ɱɢɫɥɨξ2
ɜ ɰɟɩɧɭɸ ɞɪɨɛɶ
ɇɚɱɧɺɦɫɥɟɝɤɨɩɪɨɜɟɪɹɟɦɨɝɨɬɨɠɞɟɫɬɜɚ
ξ
=1+
2
ଵ
ଵାξଶ
ɉɨɞɫɬɚɜɥɹɹɜɡɧɚɦɟɧɚɬɟɥɟɜɦɟɫɬɨξ2
ɟɝɨ ɜɵɪɚɠɟɧɢɟɢɡ ɬɨɠɞɟɫɬɜɚ ɩɨɥɭ
ɱɢɦ
ξ
=1+
2
ଵାቀଵା
ଵ
భ
భశξమ
=1+
ቁ
ଶା
ଵ
భ
భశξమ
=1+
ଶା
భశ൬భశ
ଵ
=1+
భ
భ
൰
భశξమ
ଶା
ଵ
= ڮ
భ
భ
మశ
భశξమ
ത
]
ɢɬɨɝɨξ2
=[1; 2,2, 2, …]=[1; 2
ɗɬɨɬɩɪɢɦɟɪɢɥɥɸɫɬɪɢɪɭɟɬ ɬ ɟɨɪɟ ɦɭ ɨɫɭɳɟɫɬɜɨɜɚɧɢɢɟɞɢɧɫɬɜɟɧɧɨɣɛɟɫ
ɤɨɧɟɱɧɨɣɩɟɪɢɨɞɢɱɟɫɤɨɣ ɰɟɩɧɨɣɞɪɨɛɢɜɤɨɬɨɪɭɸɪɚɫɤɥɚɞɵɜɚɟɬɫɹɥɸɛɚɹɤɜɚɞ ɪɚɬɢɱɧɚɹ ɢɪɪɚɰɢɨɧɚɥɶɧɨɫɬɶ ɬɢɩɚξ2
,ξ3,ξ5,…

ɉɪɢɦɟɪ ɂɡɜɟɫɬɧɵɟɦɚɬɟɦɚɬɢɱɟɫɤɢɟɤɨɧɫɬɚɧɬɵ– ɱɢɫɥɚɟ ɢߨ – ɪɚɫɤɥɚ
ത
ɞɵɜɚɸɬɫɹɜɫɥɟɞɭɸɳɢɟɛɟɫɤɨɧɟɱɧɵɟɧɟɩɟɪɢɨɞɢɱɟɫɤɢɟ ɰɟɩɧɵɟɞɪɨɛɢ
ஶ
]
݁ =[2; 1,2݊,1
ߨ =
[
3; 7,15,1,292,1,1,1,2,1,3,1,14,…]
[
2; 1, 2, 1, 1, 4, 1, 1, 6, 1, …],
=
௡ୀଵ
Ⱦɥɹɨɫɧɨɜɚɧɢɹɧɚɬɭɪɚɥɶɧɵɯɥɨɝɚɪɢɮɦɨɜɰɟɩɧɚɹɞɪɨɛɶɛɭɞɭɱɢɧɟɩɟɪɢɨɞɢ
ɱɟɫɤɨɣɢɦɟɟɬɩɪɨɡɪɚɱɧɨɟɫɬɪɨɟɧɢɟɬɨɝɞɚɤɚɤɞɥɹɱɢɫɥɚߨ ɧɢɤɚɤɚɹɡɚɤɨɧɨɦɟɪ ɧɨɫɬɶɫɥɟɞɨɜɚɧɢɹɱɢɫɟɥɧɟɢɡɜɟɫɬɧɚ
Ɉɛɪɵɜɚɹ ɰɟɩɧɭɸ ɞɪɨɛɶ ɧɚ ɧɟɤɨɬɨɪɨɦ ɡɜɟɧɟ ɩɨɥɭɱɢɦ ɩɨɞɯɨɞɹɳɭɸ ɞɪɨɛɶ– ɩɪɨɫɬɭɸɞɪɨɛɶɹɜɥɹɸɳɭɸɫɹɧɚɢɥɭɱɲɢɦɪɚɰɢɨɧɚɥɶɧɵɦɩɪɢɛɥɢɠɟɧɢɟɦ ɢɫɯɨɞɧɨɣɰɟɩɧɨɣɞɪɨɛɢ
ɉɪɢɦɟɪ 20 ɉɨɥɭɱɢɦɩɟɪɜɵɟɩɨɞɯɨɞɹɳɢɟɞɪɨɛɢɞɥɹɱɢɫɥɚߨ ɇɭɥɟɜɚɹ ɩɨɞɯɨɞɹɳɚɹɞɪɨɛɶ– ɰɟɥɚɹɱɚɫɬɶɱɢɫɥɚ
ܲ
଴
ܳ
଴
=3=
3
;
1
 ɩɟɪɜɚɹ ɩɨɞɯɨɞɹɳɚɹɞɪɨɛɶɩɨɥɭɱɚɟɬɫɹɩɪɢɭɱɺɬɟɨɞɧɨɝɨɞɪɨɛɧɨɝɨɡɜɟɧɚ
ܲ
ଵ
ܳ
ଵ
=3+
1
22
=
7
ൎ 3,143
7
ɚɪɯɢɦɟɞɨɜɨɱɢɫɥɨ ɜɬɨɪɚɹ ɩɨɞɯɨɞɹɳɚɹɞɪɨɛɶ
ܲ
ଶ
ܳ
ଶ
=3+
1
7+
1
15
333
=
106
ൎ 3,14151;
 ɬɪɟɬɶɹ ɩɨɞɯɨɞɹɳɚɹɞɪɨɛɶ
ܲ
ܳ
ଷ
=3+
ଷ
7+
1
1
15 +
355
=
ൎ 3,1415929;
113
1 1
 ɱɟɬɜɺɪɬɚɹ ɩɨɞɯɨɞɹɳɚɹɞɪɨɛɶ

ܲ
ସ
ܳ
=3+
ସ
7+
15 +
1
1
1+
1
292
1
103993
=
33102
ൎ 3,1415926530
ɢɬ ɞ
Ⱦɥɹɫɪɚɜɧɟɧɢɹɩɪɢɜɟɞɺɦɞɟɫɹɬɢɱɧɨɟɩɪɟɞɫɬɚɜɥɟɧɢɟɱɢɫɥɚߨ
ߨ = 3,14159265359 …
ɉɪɢ ɭɱɺɬɟ ɤɚɠɞɨɝɨɞɨɛɚɜɨɱɧɨɝɨ ɡɜɟɧɚ ɰɟɩɧɨɣ ɞɪɨɛɢ ɤɨɥɢɱɟɫɬɜɨɜɟɪɧɵɯ ɞɟɫɹɬɢɱɧɵɯɡɧɚɤɨɜɩɪɢɪɚɫɬɚɟɬɜɫɪɟɞɧɟɦɧɚɞɜɚ
ɉɨɫɤɨɥɶɤɭɤɚɠɞɚɹɩɨɫɥɟɞɭɸɳɚɹɩɨɞɯɨɞɹɳɚɹɞɪɨɛɶɜɵɱɢɫɥɹɟɬɫɹɜɫɺɛɨɥɟɟ ɬɪɭɞɨɺɦɤɨɩɪɹɦɨɟɜɵɱɢɫɥɟɧɢɟɩɨɞɯɨɞɹɳɢɯɞɪɨɛɟɣɧɟɭɞɨɛɧɨɨɛɵɱɧɨɩɨɥɶɡɭ ɸɬɫɹɫɥɟɞɭɸɳɢɦɩɪɚɜɢɥɨɦ ɩɟɪ ɜɵɟ ɞɜ ɟɩɨɞɯɨɞɹɳɢɯɞɪɨɛɢɞɥɹɰɟɩɧɨɣɞɪɨɛɢ
[
ݍ
; ݍଵ, ݍଶ, ݍ
଴
,…]
ଷ
ɜɵɱɢɫɥɹɸɬɧɟɩɨɫɪɟɞɫɬɜɟɧɧɨ
ܲ
଴
= ݍ
ܳ
଴
ܲ
ଵ
= ݍ
+
଴
ܳ
ଵ
ݍ
଴
=
,
଴
1
1
ݍ
+1
଴ݍଵ
=
ݍ
ଵ
,
ݍ
ଵ
ɚɞɥɹɧɚɯɨɠɞɟɧɢɹɩɨɫɥɟɞɭɸɳɢɯɩɨɞɯɨɞɹɳɢɯɞɪɨɛɟɣ ɩɪɢɦɟɧɹɸɬɪ ɟɤɭɪɪ ɟɧɬ ɧɭɸɮɨɪɦɭɥɭ
ܲ
ݍ
௞
=
ܳ
ݍ௞ܳ
௞
௞ܲ௞ିଵ
௞ିଵ
+ ܲ + ܳ
௞ିଶ
, ݇ =2,3,…
௞ିଶ
Ɂɞɟɫɶ ݍ
– ɱɚɫɬɧɵɟ ɤɨɬɨɪɵɟ ɜɨɡɧɢɤɚɸɬ ɩɪɢ ɪɟɚɥɢɡɚɰɢɢ ɚɥɝɨɪɢɬɦɚ ȿɜɤɥɢɞɚ
௞
ɨɧɢɩɨɦɟɱɟɧɵɤɭɪɫɢɜɨɦɜɜɵɲɟɥɟɠɚɳɢɯɩɪɢɦɟɪɚɯɌɚɤɢɦɨɛɪɚɡɨɦɚɥɝɨɪɢɬɦ ȿɜɤɥɢɞɚ ɩɪɢɦɟɧɹɟɬɫɹ ɧɟ ɬɨɥɶɤɨ ɞɥɹ ɜɵɱɢɫɥɟɧɢɹ ɇɈȾ ɧɨ ɢ ɞɥɹ ɪɚɡɥɨɠɟɧɢɹ ɩɪɨɫɬɨɣɞɪɨɛɢɜɰɟɩɧɭɸ
ସ଴
ɉɪɢɦɟɪ Ɋɚɡɥɨɠɢɬɶ ɩɪɨɫɬɭɸ ɞɪɨɛɶ
ɜɰɟɩɧɭɸɢɧɚɣɬɢɞɥɹɧɟɺɜɫɟ
ଶଷ
ɩɨɞɯɨɞɹɳɢɟɞɪɨɛɢ

ʑ ʞ˓ˋˏˈ˓ˈ 9 ˄˞ˎˑ ˅˞˒ˑˎːˈːˑ ˇˈˎˈːˋˈ 40 ː˃ 23 ˒ˑ ˃ˎˆˑ˓ˋ˕ˏ˖ ʔ˅ˍˎˋˇ˃
      1    5 5 5 5 5 0
2
1
1
Ɋɚɡɥɨɠɟɧɢɟ ɜɰɟɩɧɭɸɞɪɨɛɶɢɦɟɟɬɜɢɞ
1+
1
2+
1
1
1+
.
1 5
40
23
[
=
ݍ଴; ݍଵ, ݍଶ, ݍଷ, ݍ
]=[
1; 1, 2, 1, 5]=1+
ସ
ɉɨɞɯɨɞɹɳɢɟɞɪɨɛɢ ɧɭɥɟɜɚɹ
ܲ
ݍ
଴
=
ܳ
଴
1
଴
=
,
1
1
ɩɟɪɜɚɹ
ܲ
ଵ
= ݍ
ܳ
ଵ
1
+
଴
ݍ
ଵ
=1+
1
2
=
;
1
1
ɞɚɥɟɟ– ɩɨɪɟɤɭɪɪɟɧɬɧɨɣɮɨɪɦɭɥɟ ɜɬɨɪɚɹ
ܲ
ଶ
ܳ
ଶ
ݍ
ଶܲଵ
=
ݍଶܳଵ+ ܳ
+ ܲ
଴
=
଴
2 ή2+1 2 ή1+1
5
=
,
3

ɬɪɟɬɶɹ
ܲ
ଷ
ܳ
ଷ
ݍ
ଷܲଶ
=
ݍଷܳଶ+ ܳ
+ ܲ
ଵ
=
ଵ
1 ή5+2 1 ή3+1
7
=
,
4
ɱɟɬɜɺɪɬɚɹ
ܲ
ସ
ܳ
=
ସ
ݍ
+ ܲ
ସܲଷ
ݍସܳଷ+ ܳ
ଶ
=
ଶ
5 ή7+5 5 ή4+3
40
=
.
23
ɉɨɥɭɱɟɧɚɢɫɯɨɞɧɚɹɞɪɨɛɶ
ଵ଻
ɉɪɢɦɟɪ 22 Ɋɚɡɥɨɠɢɬɶ ɩɪɨɫɬɭɸ ɞɪɨɛɶ
ɜɰɟɩɧɭɸɢɧɚɣɬɢɞɥɹɧɟɺɜɫɟ
ଶଽ
ɩɨɞɯɨɞɹɳɢɟɞɪɨɛɢ
ʑ ʞ˓ˋˏˈ˓ˈ 8 ˄˞ˎˑ ˅˞˒ˑˎːˈːˑ ˇˈˎˈːˋˈ 17 ː˃ 29 ˒ˑ ˃ˎˆˑ˓ˋ˕ˏ˖ ʔ˅ˍˎˋˇ˃
  0 0   1   1   2 5 2 2 2  2 2  0

5

Ɋɚɡɥɨɠɟɧɢɟ ɜɰɟɩɧɭɸɞɪɨɛɶɢɦɟɟɬɜɢɞ
17
[
=
ݍ଴; ݍଵ, ݍଶ, ݍଷ, ݍସ, ݍ
29
]=[
ହ
ɉɨɞɯɨɞɹɳɢɟɞɪɨɛɢ ɧɭɥɟɜɚɹ

0; 1,1, 2, 2, 2]=0+
ݍ
ܲ
଴
=
ܳ
଴
0
଴
=
,
1
1
1+
1+
1
1
2+
1
1
2+
.
1 2
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