xor-encoded vigenere cypher decoder for ru-ru alphabet

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Alex Vanin fce4e16333 Initial commit		2022-10-16 20:05:18 +03:00
example	Initial commit	2022-10-16 20:05:18 +03:00
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top.go	Initial commit	2022-10-16 20:05:18 +03:00
util.go	Initial commit	2022-10-16 20:05:18 +03:00

README.md

xor-vigenere

xor-encoded vigenere cypher decoder for ru-ru alphabet. Decodes uppercase text without white spaces and Ë letter.

Build

Requires go1.19

$ go build .

Usage

Specify input file and wait for result.

$ ./xor-vigenere -i example/cipher.txt -r 2
Cypher text file: example/cipher.txt
Parallel workers: 12 (override with -w flag)
Trying to predict secret key length ... 8 (override with -l flag)
Cypher text sample size to analyze: 2000 (override with -s flag)
Number of letters in permutations: 4 [ОЕАИ] (override with -p flag)
Number of results to show: 2 (override with -r flag)
Analyzing 100% [##################################################] (65536/65536, 36315 keys/s)        

Key=АБЫРВАЛГ Sample:ГДЕЖЕВЕСЬМИРВДЕНЬМОЕГОРОЖДЕНИЯГДЕЭЛЕКТРИЧЕСКИЕФО Div:0.145333
Key=АЙЫРВАЛГ Sample:ГМЕЖЕВЕСЬДИРВДЕНЬДОЕГОРОЖМЕНИЯГДЕХЛЕКТРИЧНСКИЕФО Div:0.166576
Execution duration: 1.805705397s

АБЫРВАЛГ is a valid secret key on top.

To receive better (but slower) results use:

bigger sample size for analyzing cypher text (-s 0 for analyzing whole text)
look through more possible keys (-r flag)
use more frequently used letters to create more permutations (slows really hard, -p flag)