1 files changed, 101 insertions, 0 deletions
diff --git a/src/utils/Frequencies.scala b/src/utils/Frequencies.scala
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+++ b/src/utils/Frequencies.scala
@@ -0,0 +1,101 @@
+package ixee.cryptopals.utils
+
+object Frequencies {
+  lazy val frequencies = Seq(
+    cryptologicalMathematics,
+    cornell40kSample
+  )
+
+  // http://www.math.cornell.edu/~mec/2003-2004/cryptography/subs/frequencies.html
+  val cornell40kSample = FrequencyMap(
+    'e' -> 0.1202,
+    't' -> 0.0910,
+    'a' -> 0.0812,
+    'o' -> 0.0768,
+    'i' -> 0.0731,
+    'n' -> 0.0695,
+    's' -> 0.0628,
+    'r' -> 0.0602,
+    'h' -> 0.0592,
+    'd' -> 0.0432,
+    'l' -> 0.0398,
+    'u' -> 0.0288,
+    'c' -> 0.0271,
+    'm' -> 0.0261,
+    'f' -> 0.0230,
+    'y' -> 0.0211,
+    'w' -> 0.0209,
+    'g' -> 0.0203,
+    'p' -> 0.0182,
+    'b' -> 0.0149,
+    'v' -> 0.0111,
+    'k' -> 0.0069,
+    'x' -> 0.0017,
+    'q' -> 0.0011,
+    'j' -> 0.0010,
+    'z' -> 0.0007
+  )
+
+  // from http://en.algoritmy.net/article/40379/Letter-frequency-English
+  val cryptologicalMathematics = FrequencyMap(
+    'a' -> 0.08167,
+    'b' -> 0.01492,
+    'c' -> 0.02782,
+    'd' -> 0.04253,
+    'e' -> 0.12702,
+    'f' -> 0.02228,
+    'g' -> 0.02015,
+    'h' -> 0.06094,
+    'i' -> 0.06966,
+    'j' -> 0.00153,
+    'k' -> 0.00772,
+    'l' -> 0.04025,
+    'm' -> 0.02406,
+    'n' -> 0.06749,
+    'o' -> 0.07507,
+    'p' -> 0.01929,
+    'q' -> 0.00095,
+    'r' -> 0.05987,
+    's' -> 0.06327,
+    't' -> 0.09056,
+    'u' -> 0.02758,
+    'v' -> 0.00978,
+    'w' -> 0.02360,
+    'x' -> 0.00150,
+    'y' -> 0.01974,
+    'z' -> 0.00074
+  )
+
+  // http://en.wikipedia.org/wiki/Letter_frequency#cite_note-13
+  // Calculated from "Project Gutenberg Selections" available from the NLTK Corpora
+  // http://nltk.googlecode.com/svn/trunk/nltk_data/index.xml
+  // has since gone dead.
+  val firstLetterOfWord = FrequencyMap(
+    'a' -> 0.11602,
+    'b' -> 0.04702,
+    'c' -> 0.03511,
+    'd' -> 0.02670,
+    'e' -> 0.02007,
+    'f' -> 0.03779,
+    'g' -> 0.01950,
+    'h' -> 0.07232,
+    'i' -> 0.06286,
+    'j' -> 0.00597,
+    'k' -> 0.00590,
+    'l' -> 0.02705,
+    'm' -> 0.04374,
+    'n' -> 0.02365,
+    'o' -> 0.06264,
+    'p' -> 0.02545,
+    'q' -> 0.00173,
+    'r' -> 0.01653,
+    's' -> 0.07755,
+    't' -> 0.16671,
+    'u' -> 0.01487,
+    'v' -> 0.00649,
+    'w' -> 0.06753,
+    'x' -> 0.00017,
+    'y' -> 0.01620,
+    'z' -> 0.00034
+  )
+}