Fix the typo "frequences" to frequencies.
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@@ -21,16 +21,16 @@
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(defn chi-squared-statistic
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"To calculate the frequency distribution of a language. More detail about the algorithm here: http://practicalcryptography.com/cryptanalysis/text-characterisation/chi-squared-statistic/"
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[text letter-frequences]
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[text letter-frequencies]
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(let [length-text (count text)
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letter-counts (count-characters (cs/lower-case text))]
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;letter-counts
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(reduce
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(fn [acc [char count]]
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(+ acc
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(if (contains? letter-frequences char)
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(if (contains? letter-frequencies char)
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(chi-squared-letter-statistic count
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(get letter-frequences char)
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(get letter-frequencies char)
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length-text)
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0)))
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0
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@@ -17,9 +17,9 @@
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(defn get-all-scores
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"For pairs (key, plaintext) finds scores and return list of pairs [key, score]."
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[letter-frequences pairs]
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[letter-frequencies pairs]
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(map (fn [[key text]]
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[key (ca/chi-squared-statistic text letter-frequences)])
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[key (ca/chi-squared-statistic text letter-frequencies)])
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pairs))
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(defn get-min-score-pair
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@@ -34,18 +34,18 @@
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(defn get-key
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"To find the key with frequencies of letters."
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[ciphertext symbols letter-frequences]
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[ciphertext symbols letter-frequencies]
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(->> (get-all-texts ciphertext symbols)
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(get-all-scores letter-frequences)
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(get-all-scores letter-frequencies)
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(get-min-score-pair)
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(first)))
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(defn get-plaintext
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"Return the plaintext from a ciphertext. The function is case-insensitive."
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[ciphertext symbols letter-frequences]
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[ciphertext symbols letter-frequencies]
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(let [ciphertext (cs/lower-case ciphertext)]
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(caesar/decrypt-message ciphertext
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(get-key ciphertext symbols letter-frequences)
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(get-key ciphertext symbols letter-frequencies)
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symbols)))
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(defn frequency-analizer-get-plaintext
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@@ -4,7 +4,7 @@
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[cipher-analytical-machine.ciphers.caesar :as caesar]
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[cipher-analytical-machine.analyzers.caesar :as caesar-analyzers]
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[cipher-analytical-machine.symbols.factories :as sf]
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[cipher-analytical-machine.symbols.frequences :as symbol-frequences]
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[cipher-analytical-machine.symbols.frequencies :as symbol-frequencies]
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[clojure.string :as cs]
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[clojure.tools.cli :refer [parse-opts]])
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(:gen-class))
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@@ -155,7 +155,7 @@
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[options arguments action-type]
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(let [message (:message options)
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symbols (:symbols options)
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frequencies symbol-frequences/english-letter-frequences]
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frequencies symbol-frequencies/english-letter-frequencies]
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(cond
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(= action-type :cracking)
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(caesar-analyzers/get-plaintext message symbols frequencies)
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@@ -1,4 +1,4 @@
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(ns cipher-analytical-machine.symbols.frequences
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(ns cipher-analytical-machine.symbols.frequencies
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(:gen-class))
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(def english-letter-frequences {
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@@ -2,7 +2,7 @@
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(:require
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[clojure.test :refer :all]
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[cipher-analytical-machine.analyzers.caesar :refer :all]
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[cipher-analytical-machine.symbols.frequences :as sf]
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[cipher-analytical-machine.symbols.frequencies :as sf]
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[cipher-analytical-machine.analyzers.analyzers :as ca]
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[clojure.string :as cs]))
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@@ -25,9 +25,9 @@
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(testing "There're 27 combinations for a 'Hello World'."
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(let [ciphertext "khoorczruog"
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symbols "abcdefghijklmnopqrstuvwxyz "
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frequences sf/english-letter-frequences
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frequencies sf/english-letter-frequencies
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text-pairs (get-all-texts ciphertext symbols)]
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(is (= 27 (count (get-all-scores frequences text-pairs)))))))
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(is (= 27 (count (get-all-scores frequencies text-pairs)))))))
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(deftest get-min-score-pair-test
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(testing "If a key is one, then the min score pair is 15."
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@@ -40,47 +40,47 @@
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ciphertext "khoorczruog"
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key 3
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symbols "abcdefghijklmnopqrstuvwxyz "
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frequences sf/english-letter-frequences]
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frequencies sf/english-letter-frequencies]
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(testing "The plaintext is encrypted with 3 as the key."
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(is (= key (get-key ciphertext symbols frequences)))))
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(is (= key (get-key ciphertext symbols frequencies)))))
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(let [; З поеми "Кавказ" Тараса Григоровича Шевченка:
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plaintext "Борітеся – поборете, Вам Бог помагає! За вас правда, за вас слава. І воля святая!"
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ciphertext "жхчощйшде–ецхжхчйщй,езєуежхиецхуєиєк!емєезєшецчєзїє,емєезєшештєзє.еоезхтдешздщєд!"
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key 7
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symbols "абвгґдеєжзиіїйклмнопрстуфхцчшщьюя "
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frequences sf/ukrainian-letter-frequences]
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frequencies sf/ukrainian-letter-frequencies]
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(testing "The plaintext is encrypted with 3 as the key."
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(is (= key (get-key ciphertext symbols frequences))))))
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(is (= key (get-key ciphertext symbols frequencies))))))
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(deftest get-plaintext-test
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(let [plaintext "hello world"
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ciphertext "khoorczruog"
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symbols "abcdefghijklmnopqrstuvwxyz "
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frequences sf/english-letter-frequences]
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frequencies sf/english-letter-frequencies]
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(testing "The plaintext is encrypted with 3 as the key."
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(is (= plaintext (get-plaintext ciphertext symbols frequences))))
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(is (= plaintext (get-plaintext ciphertext symbols frequencies))))
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(testing "The ciphertext is case-insensitive."
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(is (= plaintext (get-plaintext "KhoorcZruog" symbols frequences)))))
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(is (= plaintext (get-plaintext "KhoorcZruog" symbols frequencies)))))
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(let [; З поеми "Кавказ" Тараса Григоровича Шевченка:
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plaintext "Борітеся – поборете, Вам Бог помагає! За вас правда, за вас слава. І воля святая!"
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ciphertext "жхчощйшде–ецхжхчйщй,езєуежхиецхуєиєк!емєезєшецчєзїє,емєезєшештєзє.еоезхтдешздщєд!"
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key 7
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symbols "абвгґдеєжзиіїйклмнопрстуфхцчшщьюя "
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frequences sf/ukrainian-letter-frequences]
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frequencies sf/ukrainian-letter-frequencies]
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(testing "The ciphertext is case-insensitive."
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(is (= (cs/lower-case plaintext)
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(get-plaintext ciphertext symbols frequences))))))
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(get-plaintext ciphertext symbols frequencies))))))
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(deftest frequency-analizer-get-plaintext-test
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(let [plaintext "abc"
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ciphertext "bca"
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key 1
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symbols "abc"
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frequences sf/english-letter-frequences]
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frequencies sf/english-letter-frequencies]
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(testing "The ciphertext is 'bca' and key is 1."
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(is (= plaintext
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(frequency-analizer-get-plaintext ciphertext symbols frequences))))))
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(frequency-analizer-get-plaintext ciphertext symbols frequencies))))))
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