Îãëàâëåíèå
Êðèïòîñèñòåìà Õèëëà 3
Ïðèìåð-øèôðîâàíèå 3
Ïðèìåð-ðàñøèôðîâàíèå 4
Ðàñøèðåííûé àëãîðèòì Åâêëèäà 5
Çàäàíèå 1 7
Çàäàíèå 2 7
Çàäàíèå 3 8
Çàäàíèå 4 8
Ðåæèìû øèôðîâàíèÿ 9
Çàäàíèå 5 12
Çàäàíèå 6 12
Çàäàíèå 7 12
Çàäàíèå 8 12
Çàäàíèå 9 13
Çàäàíèå 10 13
Çàäàíèå 11 13
Çàäàíèå 12 13
Çàäàíèå 13 14
Çàäàíèå 14 14
Çàäàíèå 15 14
Çàäàíèå 16 14
Çàäàíèå 17 14
Çàäàíèå 18 15
×àñòîòíûé àíàëèç 16
Çàäàíèå 19 17
Ïðèìåð äåøèôðàöèè êðèïòîãðàììû 18
Âàðèàíòû ê çàäàíèþ 19 21
1 21
2 21
3 21
4 21
5 21
6 21
7 22
8 22
9 22
10 22
11 22
12 22
13 23
14 23
15 23
16 23
17 23
18 24
19 24
20 24
Ëèòåðàòóðà 25
Êðèïòîñèñòåìà Õèëëà
Øèôð çàìåíû. Òîëüêî çàìåíà âûïîëíÿåòñÿ íå ñèìâîëà íà ñèìâîë, à áëîêà ñèìâîëîâ íà áëîê ñèìâîëîâ. Òàêîé øèôð íàçûâàþò áëî÷íûì. Ðàññìîòðèì ñëó÷àé, êîãäà áëîê ñîñòîèò èç äâóõ ñèìâîëîâ. Èäåÿ çàìåíû áûëà ïðåäëîæåíà Õèëëîì â ñòàòüÿõ: L. S. Hill, "Concerning certain linear transformation apparatus of cryptography", American Mathematical Monthly, Volume 38 (1931), 135-154. Lester S. Hill, Cryptography in an Algebraic Alphabet, The American Mathematical Monthly Vol.36, June–July 1929, pp. 306–312.
Ïðèìåð-øèôðîâàíèå
Ðàññìîòðèì ñîîáùåíèå:
THE GOLD IS BURIED IN ORONO.
Ñôîðìèðóåì áëîêè ïî 2 ñèìâîëà:
TH EG OL DI SB UR IE DI NO RO NO.
Ò. ê. ó êàæäîãî ñèìâîëà åñòü ñâîé ÷èñëîâîé ýêâèâàëåíò (òàáë.1), òî ïîëó÷åííûå áëîêè áóäóò âûãëÿäåòü òàê:
19 7 4 6 14 11 3 8 18 1 20 17 8 4 3 8 13 14 17 14 13 14.
Òàáëèöà 1

Êàæäûé áëîê èç äâóõ ÷èñåë
èñõîäíîãî ñîîáùåíèÿ ïðåîáðàçóåòñÿ â áëîê èç äâóõ ÷èñåë
çàøèôðîâàííîãî ñîîáùåíèÿ ïî ñëåäóþùåé ôîðìóëå:
![]()
ãäå
,
, À – ìàòðèöà ðàçìåðíîñòè 2x2.
Ïóñòü
, òîãäà øèôðîâàíèå ïåðâîãî áëîêà
áóäåò âûãëÿäåòü òàê:

ãäå ![]()
![]()
Åñëè ïðèìåíèòü ýòó ôîðìóëó êî âñåì áëîêàì, òî ïîëó÷èì ñëåäóþùèé ðåçóëüòàò:
6 25 18 2 23 13 21 2 3 9 25 23 4 14 21 2 17 2 1l l8 l7 2.
Èëè â ñèìâîëüíîì âèäå:
GZ SC XN VC DJ ZX EO VC RC LS RC.
Ïðèìåð-ðàñøèôðîâàíèå
Ðàñøèôðîâàíèå âûïîëíÿåòñÿ ïî ôîðìóëå:
,
ãäå
- îáðàòíàÿ ê
ìàòðèöà ïî mod 26.
Äëÿ ìàòðèöû
![]()
åñëè îïðåäåëèòåëü
![]()
ÿâëÿåòñÿ âçàèìíî ïðîñòûì ñî çíà÷åíèåì ìîäóëÿ (â äàííîì ñëó÷àå 26), òî
îáðàòíóþ ìàòðèöó
ìîæíî íàéòè ïî ñëåäóþùåé ôîðìóëå:
![]()
ãäå
- îáðàòíîå çíà÷åíèå ïî óìíîæåíèþ äëÿ
ïî ìîäóëþ 26.
Äëÿ ìàòðèöû
îáðàòíàÿ ïî ìîäóëþ 26 áóäåò ìàòðèöà
.
Òîãäà, ðàñøèôðîâêà, íàïðèìåð, ïåðâîãî çàøèôðîâàííîãî áëîêà áóäåò òàêîé:
,
ãäå ![]()
![]()
Ðàñøèðåííûé àëãîðèòì Åâêëèäà
Äëÿ ïîèñêà îáðàòíîãî çíà÷åíèÿ ïî óìíîæåíèþ ïðèìåíÿþò ðàñøèðåííûé àëãîðèòì Åâêëèäà ðèñ.1.
–
Ðåàëèçàöèÿ â Python:
def findModInverse(a, m): # Returns the modular inverse of a % m, which is # the number x such that a*x % m = 1 if gcd(a, m) != 1: return None # no mod inverse if a & m aren't relatively prime # Calculate using the Extended Euclidean Algorithm: u1, u2, u3 = 1, 0, a v1, v2, v3 = 0, 1, m while v3 != 0: q = u3 // v3 # // is the integer division operator v1, v2, v3, u1, u2, u3 = (u1 - q * v1), (u2 - q * v2), (u3 - q * v3), v1, v2, v3 return u1 % m |
 ïðèâåäåííîì êîäå èñïîëüçóåòñÿ ôóíêöèÿ gcd –ðåàëèçàöèÿ àëãîðèòìà Åâêëèäà ïîèñêà íàèáîëüøåãî îáùåãî äåëèòåëÿ äâóõ ÷èñåë (ðèñ.2):

Ðåàëèçàöèÿ â Python:
def gcd(a, b): # Return the GCD of a and b using Euclid's Algorithm while a!= 0: a, b = b % a, a return b |
Çàäàíèå 1
Íàéòè îáðàòíîå çíà÷åíèå ïî óìíîæåíèþ äëÿ 550 ïî mod 1759.  òàáëèöå ïîêàçàíà ïîøàãîâàÿ ðåàëèçàöèÿ àëãîðèòìà, ïðèâåäåííîãî íà ðèñ.1.

Ïðîâåðèòü ïîëó÷åííûé ðåçóëüòàò ñ ïîìîùüþ ôóíêöèè findModInverse. Äëÿ ýòîãî ôóíêöèè gcd è findModInverse çàïèñàòü â ôàéë utilFunctions. py. Ïîñëå ýòîãî èìïîðòèðîâàòü â ñâîþ ïðîãðàììó ôóíêöèþ findModInverse:
from utilFunctions import findModInverse
Íàéòè îáðàòíîå äëÿ à=141:
a_inv = findModInverse(a, 256)
Çàäàíèå 2
Ðàñøèôðîâàòü ôàéë im3_hill_c_all. bmp. Êëþ÷ – ìàòðèöà K=[[189 58]
[ 21 151]].
×òîá ñäåëàòü êîä íàãëÿäíåé, ìîæíî èìïîðòèðîâàòü ôóíêöèè äëÿ ÷òåíèÿ è çàïèñè äàííûõ èç ôàéëà òàê:
from read_write_file import read_data_1byte as read
from read_write_file import write_data_1byte as write
Òîãäà, ïðî÷èòàòü äàííûå èç ôàéëà:
c_data = read('im3_hill_c_all. bmp ')
Çàäàíèå 3
Äåøèôðîâàòü png-ôàéë b4_hill_c_all. png. Ïåðâûå ÷åòûðå áàéòà â ëþáîì png-ôàéëå: 137, 80, 78, 71.
Çàäàíèå 4
Äåøèôðîâàòü ôàéë text2_hill_c_all. txt. Èçâåñòíî, ÷òî òåêñò â ôàéëå íà÷èíàåòñÿ ñî ñëîâà Whose.
Ðåæèìû øèôðîâàíèÿ
Äîïîëíèòü íèæåïðèâåäåííûå ñõåìû îïèñàíèåì ïðåèìóùåñòâ è íåäîñòàòêîâ ïåðå÷èñëåííûõ ðåæèìîâ øèôðîâàíèÿ.
Ðàññìîòðåííûå ðàíåå àëãîðèòìû âûïîëíÿëèñü â ðåæèìå ECB (ðèñ.3).

Ðåæèì øèôðîâàíèÿ CBC (ðèñ.4, 5).


Ðåæèì øèôðîâàíèÿ OFB (ðèñ.6, 7).


Ðåæèì øèôðîâàíèÿ CFB (ðèñ.8, 9).


Ðåæèì øèôðîâàíèÿ CTR (ðèñ.10, 11).


Çàäàíèå 5
Ïðîâåðüòå, ÷òî äëÿ äàííûõ [1, 2, 3, 4] ðåçóëüòàò øèôðîâàíèÿ â ðåæèìå CBC øèôðîì Öåçàðÿ ñ êëþ÷îì 3 è âåêòîðîì èíèöèàëèçàöèè 1 áóäåò [3, 4, 10, 17].
Çàäàíèå 6
Ðàñøèôðîâàòü ôàéë z1_caesar_cbc_c_all. bmp – çàøèôðîâàííîå øèôðîì Öåçàðÿ èçîáðàæåíèå â ôîðìàòå bmp. Ðåæèì øèôðîâàíèÿ CBC (ðèñ. 4, 5). Êëþ÷ ðàâåí 223. Âåêòîð èíèöèàëèçàöèè ðàâåí 59. Çàøèôðîâàòü â ðåæèìå ECB è â ðåæèìå CBC, îñòàâèâ ïåðâûå 50 áàéò áåç èçìåíåíèÿ. Ñðàâíèòü ïîëó÷åííûå èçîáðàæåíèÿ.
Çàäàíèå 7
Ðàñøèôðîâàòü ôàéë im8_caesar_ofb_c_all. bmp – çàøèôðîâàííîå øèôðîì Öåçàðÿ èçîáðàæåíèå â ôîðìàòå bmp. Ðåæèì øèôðîâàíèÿ OFB (ðèñ. 6, 7). Êëþ÷ ðàâåí 56. Âåêòîð èíèöèàëèçàöèè ðàâåí 9. Çàøèôðîâàòü â ðåæèìå ECB è â ðåæèìå OFB, îñòàâèâ ïåðâûå 50 áàéò áåç èçìåíåíèÿ. Ñðàâíèòü ïîëó÷åííûå èçîáðàæåíèÿ.
Çàäàíèå 8
Ðàñøèôðîâàòü ôàéë z2_caesar_cfb_c_all. bmp – çàøèôðîâàííîå øèôðîì Öåçàðÿ èçîáðàæåíèå â ôîðìàòå bmp. Ðåæèì øèôðîâàíèÿ CFB (ðèñ. 5, 6). Êëþ÷ ðàâåí 174. Âåêòîð èíèöèàëèçàöèè ðàâåí 9. Çàøèôðîâàòü â ðåæèìå ECB è â ðåæèìå ÑFB, îñòàâèâ ïåðâûå 50 áàéò áåç èçìåíåíèÿ. Ñðàâíèòü ïîëó÷åííûå èçîáðàæåíèÿ.
Çàäàíèå 9
Ðàñøèôðîâàòü ôàéë z3_caesar_ctr_c_all. bmp – çàøèôðîâàííîå øèôðîì Öåçàðÿ èçîáðàæåíèå â ôîðìàòå bmp. Ðåæèì øèôðîâàíèÿ CTR (ðèñ. 7, 8). Êëþ÷ ðàâåí 223. Âåêòîð èíèöèàëèçàöèè ðàâåí 78. Çàøèôðîâàòü â ðåæèìå ECB è â ðåæèìå CTR, îñòàâèâ ïåðâûå 50 áàéò áåç èçìåíåíèÿ. Ñðàâíèòü ïîëó÷åííûå èçîáðàæåíèÿ.
Çàäàíèå 10
Äëÿ îäíîãî èç ðàñøèôðîâàííûõ èçîáðàæåíèé âûïîëíèòü ñëåäóþùåå: íà îäíîì è òîì æå êëþ÷å è âåêòîðå èíèöèàëèçàöèè çàøèôðîâàòü âî âñåõ ðàññìîòðåííûõ ðåæèìàõ, âêëþ÷àÿ ECB, îñòàâèâ ïåðâûå 50 áàéò áåç èçìåíåíèÿ. Ñðàâíèòü ïîëó÷åííûå èçîáðàæåíèÿ.
Çàäàíèå 11
Ðàñøèôðîâàòü ôàéë z5_vigener_cbc_c_all. bmp. Øèôð Âèæåíåðà. Ðåæèì CBC. Êëþ÷: MODELING, âåêòîð èíèöèàëèçàöèè: 67. Çàøèôðîâàòü, îñòàâèâ ïåðâûå 50 áàéò áåç èçìåíåíèÿ.
Çàäàíèå 12
Ðàñøèôðîâàòü ôàéë im4_vigener_ofb_c_all. bmp. Øèôð Âèæåíåðà. Ðåæèì OFB. Êëþ÷: MODULATOR, âåêòîð èíèöèàëèçàöèè: 217. Çàøèôðîâàòü, îñòàâèâ ïåðâûå 50 áàéò áåç èçìåíåíèÿ.
Çàäàíèå 13
Ðàñøèôðîâàòü ôàéë im5_vigener_cfb_c_all. bmp. Øèôð Âèæåíåðà. Ðåæèì CFB. Êëþ÷: MONARCH, âåêòîð èíèöèàëèçàöèè: 172. Çàøèôðîâàòü, îñòàâèâ ïåðâûå 50 áàéò áåç èçìåíåíèÿ.
Çàäàíèå 14
Ðàñøèôðîâàòü ôàéë z6_vigener_ctr_c_all. bmp. Øèôð Âèæåíåðà. Ðåæèì CTR. Êëþ÷: MONOLITH, âåêòîð èíèöèàëèçàöèè: 167. Çàøèôðîâàòü, îñòàâèâ ïåðâûå 50 áàéò áåç èçìåíåíèÿ.
Çàäàíèå 15
Ðàñøèôðîâàòü ôàéë im15_affine_cbc_c_all. bmp. Øèôð àôôèííûé. Ðåæèì CBC. a= 129 b= 107 iv = 243. Çàøèôðîâàòü, îñòàâèâ ïåðâûå 50 áàéò áåç èçìåíåíèÿ.
Çàäàíèå 16
Ðàñøèôðîâàòü ôàéë im16_affine_ofb_c_all. bmp. Øèôð àôôèííûé. Ðåæèì OFB. a= 233 b= 216 iv = 141. Çàøèôðîâàòü, îñòàâèâ ïåðâûå 50 áàéò áåç èçìåíåíèÿ.
Çàäàíèå 17
Ðàñøèôðîâàòü ôàéë im17_affine_ñfb_c_all. bmp. Øèôð àôôèííûé. Ðåæèì CFB. a= 117 b= 239 iv = 19. Çàøèôðîâàòü, îñòàâèâ ïåðâûå 50 áàéò áåç èçìåíåíèÿ.
Çàäàíèå 18
Ðàñøèôðîâàòü ôàéë z4_affine_ñtr_c_all. bmp. Øèôð àôôèííûé. Ðåæèì CTR. a= 61, b= 18, iv = 92. Çàøèôðîâàòü, îñòàâèâ ïåðâûå 50 áàéò áåç èçìåíåíèÿ.
×àñòîòíûé àíàëèç
Âñå åñòåñòâåííûå ÿçûêè èìåþò õàðàêòåðíîå ÷àñòîòíîå ðàñïðåäåëåíèå ñèìâîëîâ. Íàïðèìåð, áóêâà “Î” _ âñòðå÷àåòñÿ â ðóññêîì ÿçûêå ÷àùå äðóãèõ, à áóêâà “Ô” – ñàìàÿ ðåäêàÿ (òàáë. 2).
Ìîíîàëôàâèòíûå ïîäñòàíîâêè îáëàäàþò âàæíûì ñâîéñòâîì: îíè íå íàðóøàþò ÷àñòîò ïîÿâëåíèÿ ñèìâîëîâ, õàðàêòåðíûõ äëÿ äàííîãî ÿçûêà. Ýòî ïîçâîëÿåò êðèïòîàíàëèòèêó ëåãêî ïîëó÷èòü îòêðûòûé òåêñò ïðè ïîìîùè ÷àñòîòíîãî àíàëèçà. Äëÿ ýòîãî íóæíî ñîïîñòàâèòü ÷àñòîòû ïîÿâëåíèÿ ñèìâîëîâ øèôðà ñ âåðîÿòíîñòÿìè ïîÿâëåíèÿ áóêâ èñïîëüçóåìîãî àëôàâèòà ( â äàííîì ñëó÷àå ðóññêîãî ). Ïîñëå ýòîãî íàèáîëåå ÷àñòûå ñèìâîëû êðèïòîãðàììû çàìåíÿþòñÿ íà íàèáîëåå âåðîÿòíûå ñèìâîëû àëôàâèòà, îñòàëüíûå çàìåíû ïðîèçâîäÿòñÿ íà îñíîâå âåðîÿòíûõ ñëîâ è çíàíèÿ ñèíòàêñè÷åñêèõ ïðàâèë èñïîëüçóåìîãî ÿçûêà.
Òàáëèöà 2. Âåðîÿòíîñòè âñòðå÷àåìîñòè áóêâ ðóññêîãî ÿçûêà
Ñèìâîë | âåð_òü | ñèìâîë | âåð_òü | ñèìâîë | âåð_òü |
Ïðîáåë | 0.175 | Ê | 0.028 | × | 0.012 |
Î | 0.089 | Ì | 0.026 | É | 0.010 |
Å | 0.072 | Ä | 0.025 | Õ | 0.009 |
À | 0.062 | Ï | 0.023 | Æ | 0.007 |
È | 0.062 | Ó | 0.021 | Þ | 0.006 |
Í | 0.053 | ß | 0.018 | Ø | 0.006 |
Ò | 0.053 | Û | 0.016 | Ö | 0.004 |
Ñ | 0.045 | Ç | 0.016 | Ù | 0.003 |
Ð | 0.040 | Ü | 0.014 | Ý | 0.003 |
 | 0.038 | Á | 0.014 | Ô | 0.002 |
Ë | 0.035 | Ã | 0.013 |
Çàäàíèå 19
Èñïîëüçóÿ ÷àñòîòíûé àíàëèç, äåøèôðîâàòü êðèïòîãðàììó, çàøèôðîâàííóþ ìåòîäîì ìîíîàëôàâèòíûõ ïîäñòàíîâîê. Íàïèøèòå îò÷åò î ïðîäåëàííîé ðàáîòå.  îò÷åòå íåîáõîäèìî ïðåäñòàâèòü: íîìåð âàðèàíòà, ðàñøèôðîâàííûé èñõîäíûé òåêñò, êëþ÷ (â äàííîì ñëó÷àå êëþ÷îì ÿâëÿåòñÿ òàáëèöà çàìåí), êðàòêèé ïðîòîêîë êðèïòîàíàëèçà (ñì. ïðèìåð).
Ïðèìåð äåøèôðàöèè êðèïòîãðàììû
Ïðèìåð äåøèôðàöèè êðèïòîãðàììû, çàøèôðîâàííîé ìîíîàëôàâèòíîé ïîäñòàíîâêîé
Òåêñò êðèïòîãðàììû:
ÊÙÐÍÑÉØÙÕÄÒÀÐÁÓÒÖÏÔÞÑÍÛÀØÉÀÜÉËÁÀÍÑÉÑÒÍÑÒÎÁÍÄÙÌÙÀÉØÉÆÒËÉÀÑÁÄÍÑÉÀØÙÀÑÙÆ
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ÅÄÙÀÁÍÆÒÀÙØÀÐÙÍÑÉÑÙÎØÙÀÐÆÒØØÈÃ
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 òàáëèöå 3 íàõîäÿòñÿ ðåçóëüòàòû ñòàòèñòè÷åñêîãî àíàëèçà äàííîé êðèïòîãðàììû. Ñþäà âêëþ÷åíû çíà÷åíèÿ ÷àñòîò áóêâ ðóññêîãî ÿçûêà, à òàêæå ÷àñòîòû âñòðå÷àåìîñòè ñèìâîëîâ äëÿ äàííîé êðèïòîãðàììû.
Òàáëèöà 3
ÑÒÀÒÈÑÒÈÊÀ
Êðèïòîãðàììà | Ðóññêèé ÿçûê | ||
Ñèìâîë | ×àñòîòà | Áóêâà | Âåðîÿòíîñòü |
À | 0.121 | Ïðîáåë | 0.175 |
Ù | 0.111 | î | 0.090 |
Ñ | 0.101 | å | 0.072 |
É | 0.091 | à | 0.062 |
Í | 0.081 | è | 0.062 |
Ø | 0.081 | í | 0.053 |
Ò | 0.071 | ò | 0.053 |
Á | 0.051 | ñ | 0.045 |
Ð | 0.040 | ð | 0.040 |
Ä | 0.040 | â | 0.038 |
Æ | 0.040 | ë | 0.035 |
è ò. ä. | è ò. ä. |
Èñõîäÿ èç ïîëó÷åííîé ñòàòèñòèêè, ñäåëàåì ïåðâûå çàìåíû: “À”-“ ”, “Ù”-“Δ.
Ðåçóëüòàò:
ÊÙÐÍÑÉØÙÕÄÒÀÐÁÓÒÖÏÔÞÑÍÛÀØÉÀÜÉËÁÀÍÑÉÑÒÍÑÒÎÁÍÄÙÌÙÀÉØÉÆÒËÉÀÑÁÄÍÑÉÀ
-Î-----Î--- ----------- -- ---- ------------Î-Î ------- ------
ØÙÀÑÙÆÅÄÙÀÁÍÆÒÀÙØÀÐÙÍÑÉÑÙÎØÙÀÐÆÒØØÈÃ
-Î - Î---Î ---- Î - - Î----Î--Î -------
Îáðàòèì âíèìàíèå íà 8-îå è 12-îå ñëîâà: “ØÙ” è “ÙØ”. Ò. ê. ìû ïðåäïîëîæèëè, ÷òî “Ù” çàìåíÿåò “Δ â îòêðûòîì òåêñòå, òî áóêâà “Ø” ìîæåò áûòü òîëüêî áóêâîé “Í” èëè áóêâîé “Ò”. Ïîïðîáóåì ñäåëàòü çàìåíó “Ø”-“Í”.
Ìîæíî ïðåäïîëîæèòü, ÷òî 5-îå ñëîâî - îêàí÷èâàåòñÿ íà “ÎÃΔ è ÿâëÿåòñÿ, ñòàëî áûòü, ïðèëàãàòåëüíûì èëè ïðè÷àñòèåì.
Çàìåíà “Ì”-“Ô.
Ñëîâî, ñëåäóþùåå çà ïðèëàãàòåëüíûì èëè ïðè÷àñòèåì, ñêîðåå âñåãî ÿâëÿåòñÿ ñóùåñòâèòåëüíûì è îêàí÷èâàåòñÿ íà “À”. Îòñþäà ñëåäóåò çàìåíà “É”-“À”.
Òåïåðü èìååì ñëåäóþùóþ êàðòèíó:
ÊÙÐÍÑÉØÙÕÄÒÀÐÁÓÒÖÏÔÞÑÍÛÀØÉÀÜÉËÁÀÍÑÉÑÒÍÑÒÎÁÍÄÙÌÙÀÉØÉÆÒËÉÀÑÁÄÍÑÉÀ
-Î---ÀÍÎ--- ----------- ÍÀ - À-- --À---------ÎÃÎ ÀÍÀ---À -----À
ØÙÀÑÙÆÅÄÙÀÁÍÆÒÀÙØÀÐÙÍÑÉÑÙÎØÙÀÐÆÒØØÈÃ
ÍÎ - Î---Î ---- ÎÍ - Î--À-Î-ÍÎ ---ÍÍ--
×åòâåðòûì ñëîâîì ÿâëÿåòñÿ ïðåäëîã “ÍÀ”, ïîýòîìó ñëåäóþùåå ñëîâî îêàí÷èâàåòñÿ, ñêîðåå âñåãî, íà áóêâó “Å”.
Çàìåíÿåì “Á”-“Å”.
Øåñòîå ñëîâî èìååò âèä “ÀÍÀ---À”. Ýòî î÷åíü ïîõîæå íà ñëîâî “ÀÍÀËÈÇÀ”. Çàìåíèì “Æ”-“Ë”, “Ò”-“È”, “Ë”-“Ç”.
Ðåçóëüòàò:
ÊÙÐÍÑÉØÙÕÄÒÀÐÁÓÒÖÏÔÞÑÍÛÀØÉÀÜÉËÁÀÍÑÉÑÒÍÑÒÎÁÍÄÙÌÙÀÉØÉÆÒËÉÀÑÁÄÍÑÉÀ
-Î---ÀÍÎ--È - Å-È------- ÍÀ - ÀÇÅ --À-È--È-Å--ÎÃÎ ÀÍÀËÈÇÀ - Å---À
ØÙÀÑÙÆÅÄÙÀÁÍÆÒÀÙØÀÐÙÍÑÉÑÙÎØÙÀÐÆÒØØÈÃ
ÍÎ - ÎË--Î Å-ËÈ ÎÍ - Î--À-Î-ÍÎ - ËÈÍÍ--
Ñëîâîñî÷åòàíèå “ÍÀ - ÀÇÅ” îçíà÷àåò, âèäèìî, ñëîâà “ÍÀ ÁÀÇÅ”, ñëîâî “Å-ËÈ” ÿâëÿåòñÿ ñëîâîì “ÅÑËÈ”, à ïîñëåäíåå ñëîâî êðèïòîãðàììû “-ËÈÍÍ--” ïîõîæå íà ñëîâî “ÄËÈÍÍÛÉ”. Ñäåëàåì ñîîòâåòñòâóþùèå çàìåíû: “Ü”-“Á”, “Í”-“Ñ”, “Д-“Ä”, “È”-“Û”, “Ô-“É”.
Ðåçóëüòàò:
ÊÙÐÍÑÉØÙÕÄÒÀÐÁÓÒÖÏÔÞÑÍÛÀØÉÀÜÉËÁÀÍÑÉÑÒÍÑÒÎÁÍÄÙÌÙÀÉØÉÆÒËÉÀÑÁÄÍÑÉÀ
-ÎÄÑ-ÀÍÎ--È ÄÅ-È-----Ñ - ÍÀ ÁÀÇÅ Ñ-À-ÈÑ-È-ÅÑ-ÎÃÎ ÀÍÀËÈÇÀ - Å-Ñ-À
ØÙÀÑÙÆÅÄÙÀÁÍÆÒÀÙØÀÐÙÍÑÉÑÙÎØÙÀÐÆÒØØÈÃ
ÍÎ - ÎË--Î ÅÑËÈ ÎÍ ÄÎÑ-À-Î-ÍÎ ÄËÈÍÍÛÉ
Ñëîâî “Ñ-À-ÈÑ-È-ÅÑ-ÎÃΔ (ÀÍÀËÈÇÀ) ïîõîæå íà ñëîâî “ÑÒÀÒÈÑÒÈ×ÅÑÊÎÃΔ. Çàìåíû: “Ñ”-“Ò”, “Δ-“×”, “Ä”-“Ê”.
Ðåçóëüòàò:
ÊÙÐÍÑÉØÙÕÄÒÀÐÁÓÒÖÏÔÞÑÍÛÀØÉÀÜÉËÁÀÍÑÉÑÒÍÑÒÎÁÍÄÙÌÙÀÉØÉÆÒËÉÀÑÁÄÍÑÉÀ
-ÎÄÑÒÀÍÎ-ÊÈ ÄÅ-È----ÒÑ - ÍÀ ÁÀÇÅ ÑÒÀÒÈÑÒÈ×ÅÑÊÎÃÎ ÀÍÀËÈÇÀ ÒÅÊÑÒÀ
ØÙÀÑÙÆÅÄÙÀÁÍÆÒÀÙØÀÐÙÍÑÉÑÙÎØÙÀÐÆÒØØÈÃ
ÍÎ ÒÎË-ÊÎ ÅÑËÈ ÎÍ ÄÎÑÒÀÒÎ×ÍÎ ÄËÈÍÍÛÉ
Ïîñëåäóþùèå çàìåíû íå âûçûâàþò çàòðóäíåíèé.
Èñõîäíûé òåêñò:
ÏÎÄÑÒÀÍÎÂÊÈ ÄÅØÈÔÐÓÞÒÑß ÍÀ ÁÀÇÅ ÑÒÀÒÈÑÒÈ×ÅÑÊÎÃÎ ÀÍÀËÈÇÀ ÒÅÊÑÒÀ ÍÎ ÒÎËÜÊÎ ÅÑËÈ ÎÍ ÄÎÑÒÀÒÎ×ÍÎ ÄËÈÍÍÛÉ
Êëþ÷ (òàáëèöà çàìåí):
Íîðìàòèâíûé Àëôàâèò ( M ) | À | Á | Â | Ã | Ä | Å | Æ | Ç | È | É | Ê | Ë | Ì | Í | Î | Ï |
Àëôàâèò Øèôðîâàíèÿ(E) | É | Ü | Õ | Ì | Ð | Á | - | Ë | Ò | Ã | Ä | Æ | - | Ø | Ù | Ê |
Íîðìàòèâíûé Àëôàâèò (M) | Ð | Ñ | Ò | Ó | Ô | Õ | Ö | × | Ø | Ù | Û | Ü | Ý | Þ | ß | “_“ |
Àëôàâèò Øèôðîâàíèÿ (E) | Ï | Í | Ñ | Ô | Ö | - | - | Î | Ó | - | È | Å | - | Þ | Û | À |
Ïðî÷åðêè â òàáëèöå ñîîòâåòñòâóþò áóêâàì, íè ðàçó íå âñòðåòèâøèìñÿ â èñõîäíîì òåêñòå êðèïòîãðàììû.
Âàðèàíòû ê çàäàíèþ 19
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[1] Stallings W, “Cryptography And Network Security. Principles And Practice”, 5th Edition, 2011.


