, , . , . : .
1. , . . (Kasiski) . , , d. , m d, m . d1, d2, ., dn, (d1, d2, ., dn....)/ m. , (k = 1, 2...) , , , . , , . 4.20 .
2. , , 4.18. m , , . , , . , .
, :
LIOMWGFEGGDVWGHHCQUCRHRWAGWIOWQLKGZETKKMEVLWPCZVG'TH VTSGXQOVGCSVETQLTJSUMVWVEUVLXEWSLGFZMVVWLGYHCUSWXQH - KVGSHEEVFLCFDGVSUMPHKIRZDMPHHBVWVWJWIXGFWLTSHGJOUEEHH- VUCFVGOWICQLIJSUXGLW
, 4.4.
4.4. 4.19 | |||
JSU | |||
SUM | |||
VWV | |||
MPH |
- 4, , 4. m = 4. . C1 1, 5, 9...; C2 2, 6, 10..., . . , .
1 | LWGW | CRAO | KTEP | GTQC | TJVU | EGVG | UQGE | CVPR | PVJG | TJEU | GCJG |
P1 | jueu | apym | ircn | eroa | rhts | thin | ytra | hcie | ixst | hcar | rehe |
C2 | IGGG | QHGW | GKVC | TSOS | QSWV | WFVY | SHSV | FSHZ | HWWF | SOHC | OQSL |
P2 | usss | ctsl | swho | feae | ceih | cete | soec | atnp | nkhe | rhck | esex |
C3 | OFDN | URWQ | ZKLZ | HGVV | LUVL | SZWH | WKHF | DUKD | HVIW | HUHF | WLUW |
P3 | lcae | rotn | whiw | edss | irsi | irh | eteh | retl | tiid | eatr | airt |
C4 | MEVN | CWIL | EMWV | VXGE | TMEX | LMLC | XVEL | GMIM | BWHL | GEVV | ITX |
P4 | iard | yseh | aisr | rtca | piaf | pwte | thec | arha | esft | erec | tpt |
, m.
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( ).
Julius Caesar used a cryptosystem in his wars, which is now referred to as Caesar chipper. It is an additive chipper with the key set to three. Each character in the plaintext is shift three characters to create ciphertext.
.
, . , . , .
. . . . , - . : , , ..
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, : , , . , , . , , ?
, : ʨ , . . , , -.
, : , . ɨ -Ĩ . . , . . Ө , ɨ Ũ , Ө Ѩ .
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