some small fixes

CTFs/2014-CSAW-CTF/cryptography/crypto-200/caesarCipher.py

@@ -7,9 +7,7 @@ __author__ = "bt3gl"
 import string
 
 
-FREQ_ENGLISH = [0.0749, 0.0129, 0.0354, 0.0362, 0.1400, 0.0218, 0.0174, 0.0422, 0.0665, 0.0027, 0.0047, 0.0357,
-           0.0339, 0.0674, 0.0737, 0.0243, 0.0026, 0.0614, 0.0695, 0.0985, 0.0300, 0.0116, 0.0169, 0.0028,
-           0.0164, 0.0004]
+FREQ_ENGLISH = [0.0749, 0.0129, 0.0354, 0.0362, 0.1400, 0.0218, 0.0174, 0.0422, 0.0665, 0.0027, 0.0047, 0.0357,0.0339, 0.0674, 0.0737, 0.0243, 0.0026, 0.0614, 0.0695, 0.0985, 0.0300, 0.0116, 0.0169, 0.0028, 0.0164, 0.0004]
 
 
 
@@ -38,7 +36,7 @@ def frequency(msg):
     # Compute the word frequencies
     dict_freq = dict([(c,0) for c in string.lowercase])
     diff = 0.0
-    for c in msg:
+    for c in msg.lower():
         if 'a'<= c <= 'z':
             diff += 1
             dict_freq[c] += 1
@@ -50,14 +48,13 @@ def frequency(msg):
 
 def decipher(msg):
     # Decipher by frequency
-    min_delta = 1000
-    best_rotation = 0
+    min_delta, best_rotation = 20, 0.0
     freq = frequency(msg)
-    for key in range(26):
-        d = delta(freq, FREQ_ENGLISH)
+    for k in range(26):
+    	d = delta(freq[k:] + freq[:k], FREQ_ENGLISH)
         if d < min_delta:
             min_delta = d
-            best_rotation = key
+            best_rotation = k
     return cipher(msg, -best_rotation)
 
 
@@ -74,12 +71,17 @@ def decipher_simple(msg):
 
 if __name__ == '__main__':
 
+    # creating a cipher
     key = 13
     text = 'hacker school is awesome!'
-    cip = cipher(text, key)
-    dec = decipher(cip)
+    cipe = cipher(text, key)
+    print "Cipher: " + cipe
+  
+    # decyphering
+    with open('cipher.txt', 'r') as f:	
+	cip = f.readlines()
+	cip = cip[0].strip()
+        cipe =  decipher(cip)    	  	
+    	print "Decipher: " + cipe
 
-    print "Cipher: " + cip
-    print "Decipher: " + dec
-
-    assert(text == dec)
+    	

CTFs/WARGAMES/README.md

@@ -0,0 +1,3 @@
+## Writeups:
+
+[Narnia 1-5]: http://bt3gl.github.io/smashing-the-stack-for-fun-or-wargames-narnia-0-4.html

CTFs/WARGAMES/krypton/cipher.txt

@@ -0,0 +1 @@
+CGZNL YJBEN QYDLQ ZQSUQ NZCYD SNQVU BFGBK GQUQZ QSUQN UZCYD SNJDS UDCXJ ZCYDS NZQSU QNUZB WSBNZ QSUQN UDCXJ CUBGS BXJDS UCTYV SUJQG WTBUJ KCWSV LFGBK GSGZN LYJCB GJSZD GCHMS UCJCU QJLYS BXUMA UJCJM JCBGZ CYDSN CGKDC ZDSQZ DVSJJ SNCGJ DSYVQ CGJSO JCUNS YVQZS WALQV SJJSN UBTSX COSWG MTASN BXYBU CJCBG UWBKG JDSQV YDQAS JXBNS OQTYV SKCJD QUDCX JBXQK BMVWA SNSYV QZSWA LWAKB MVWAS ZBTSS QGWUB BGJDS TSJDB WCUGQ TSWQX JSNRM VCMUZ QSUQN KDBMU SWCJJ BZBTT MGCZQ JSKCJ DDCUE SGSNQ VUJDS SGZNL YJCBG UJSYY SNXBN TSWAL QZQSU QNZCY DSNCU BXJSG CGZBN YBNQJ SWQUY QNJBX TBNSZ BTYVS OUZDS TSUUM ZDQUJ DSICE SGNSZ CYDSN QGWUJ CVVDQ UTBWS NGQYY VCZQJ CBGCG JDSNB JULUJ STQUK CJDQV VUCGE VSQVY DQASJ UMAUJ CJMJC BGZCY DSNUJ DSZQS UQNZC YDSNC USQUC VLANB FSGQG WCGYN QZJCZ SBXXS NUSUU SGJCQ VVLGB ZBTTM GCZQJ CBGUS ZMNCJ LUDQF SUYSQ NSYNB WMZSW TBUJB XDCUF GBKGK BNFAS JKSSG QGWDC USQNV LYVQL UKSNS TQCGV LZBTS WCSUQ GWDCU JBNCS UESGN SUDSN QCUSW JBJDS YSQFB XUBYD CUJCZ QJCBG QGWQN JCUJN LALJD SSGWB XJDSU COJSS GJDZS GJMNL GSOJD SKNBJ STQCG VLJNQ ESWCS UMGJC VQABM JCGZV MWCGE DQTVS JFCGE VSQNQ GWTQZ ASJDZ BGUCW SNSWU BTSBX JDSXC GSUJS OQTYV SUCGJ DSSGE VCUDV QGEMQ ESCGD CUVQU JYDQU SDSKN BJSJN QECZB TSWCS UQVUB FGBKG QUNBT QGZSU QGWZB VVQAB NQJSW KCJDB JDSNY VQLKN CEDJU TQGLB XDCUY VQLUK SNSYM AVCUD SWCGS WCJCB GUBXI QNLCG EHMQV CJLQG WQZZM NQZLW MNCGE DCUVC XSJCT SQGWC GJKBB XDCUX BNTSN JDSQJ NCZQV ZBVVS QEMSU YMAVC UDSWJ DSXCN UJXBV CBQZB VVSZJ SWSWC JCBGB XDCUW NQTQJ CZKBN FUJDQ JCGZV MWSWQ VVAMJ JKBBX JDSYV QLUGB KNSZB EGCUS WQUUD QFSUY SQNSU

CTFs/WARGAMES/krypton/freq_count.py

@@ -0,0 +1,27 @@
+#!/bin/python
+
+import string
+import sys
+import operator
+
+def find_frequency(msg):
+    dict_freq = dict([(c, 0) for c in string.lowercase])
+    total_letters = 0.0
+    for c in msg.lower():
+        if 'a'<= c <= 'z':
+            dict_freq[c] += 1
+            total_letters += 1
+    list_freq = sorted(dict_freq.items(), key=operator.itemgetter(1))
+    return list_freq
+
+
+
+def main(filename):
+    with open(filename, 'r') as f:
+       cipher = f.readlines()
+       cipher = cipher[0].strip()
+       print(find_frequency(cipher))
+
+
+if __name__ == "__main__":
+	main(str(sys.argv[1]))

CTFs/WARGAMES/krypton/freq_count_vig.py

@@ -0,0 +1,51 @@
+#!/bin/python
+
+__author__= 'bt3gl'
+
+import string
+import sys
+import operator
+
+
+FREQ_ENGLISH = [0.0749, 0.0129, 0.0354, 0.0362, 0.1400, 0.0218, 0.0174, 0.0422, 0.0665, 0.0027, 0.0047, 0.0357,0.0339, 0.0674, 0.0737, 0.0243, 0.0026, 0.0614, 0.0695, 0.0985, 0.0300, 0.0116, 0.0169, 0.0028, 0.0164, 0.0004]
+
+
+def find_frequency(msg):
+    dict_freq = dict([(c, 0) for c in string.lowercase])
+    total_letters = 0.0
+    for c in msg.lower():
+        if 'a'<= c <= 'z':
+            dict_freq[c] += 1
+            total_letters += 1
+    list_freq = sorted(dict_freq.items(), key=operator.itemgetter(1))
+    return [(c, freq/total_letters) for (c, freq) in list_freq]
+
+
+
+def main(filename):
+    with open(filename, 'r') as f:
+       cipher = f.readlines()
+       cipher = cipher[0].strip()
+       flist = find_frequency(cipher)
+       elist = dict((k, value) for (k, value) in  zip(string.lowercase, FREQ_ENGLISH))
+       elist = sorted(elist.items(), key=operator.itemgetter(1))
+       trans, key = '', ''
+       for i, f in enumerate(flist):
+          trans += f[0]
+          key += elist[i][0]
+          print "CIPHER: %s -> %.5f, ENGLISH: %s -> %.5f" %(f[0], f[1], elist[i][0], elist[i][1])
+       print "Key is " + key + " for " + trans
+       
+       # print key sorted to translate to a-z
+       res = zip(trans, key)
+       res.sort()
+       trans, key = '', ''
+       for letter in res:
+		trans += letter[1].upper()
+		key += letter[0].upper()
+       print "tr  [" + key + "] [" + trans + "]"
+
+
+if __name__ == "__main__":
+	main(str(sys.argv[1]))
+

Cryptography/README.md

@@ -3,6 +3,8 @@
 - https://www.cryptool.org/en/cryptool1-en
 
 - frequency analyses online: 
+http://www.simonsingh.net/The_Black_Chamber/hintsandtips.html
+http://www.xarg.org/tools/caesar-cipher/
 
 
 ## ROT13
@@ -21,7 +23,3 @@ In Python we can use: ```"YRIRY GJB CNFFJBEQ EBGGRA".decode(encoding="ROT13")```
 https://docs.python.org/2/library/codecs.html#codec-base-classes
 
 ---
-
-Online: 
-
-http://www.xarg.org/tools/caesar-cipher/

Cryptography/RotationCiphers/README.md

@@ -1,6 +0,0 @@
-CryptoAnalysis
-==============
-
-* Several implementations of Caesar cipher with frequency analysis.
-
-* Vinegere code.

Cryptography/RotationCiphers/caesarCipher.py

@@ -7,9 +7,7 @@ __author__ = "bt3gl"
 import string
 
 
-FREQ_ENGLISH = [0.0749, 0.0129, 0.0354, 0.0362, 0.1400, 0.0218, 0.0174, 0.0422, 0.0665, 0.0027, 0.0047, 0.0357,
-           0.0339, 0.0674, 0.0737, 0.0243, 0.0026, 0.0614, 0.0695, 0.0985, 0.0300, 0.0116, 0.0169, 0.0028,
-           0.0164, 0.0004]
+FREQ_ENGLISH = [0.0749, 0.0129, 0.0354, 0.0362, 0.1400, 0.0218, 0.0174, 0.0422, 0.0665, 0.0027, 0.0047, 0.0357,0.0339, 0.0674, 0.0737, 0.0243, 0.0026, 0.0614, 0.0695, 0.0985, 0.0300, 0.0116, 0.0169, 0.0028, 0.0164, 0.0004]
 
 
 
@@ -38,7 +36,7 @@ def frequency(msg):
     # Compute the word frequencies
     dict_freq = dict([(c,0) for c in string.lowercase])
     diff = 0.0
-    for c in msg:
+    for c in msg.lower():
         if 'a'<= c <= 'z':
             diff += 1
             dict_freq[c] += 1
@@ -50,14 +48,13 @@ def frequency(msg):
 
 def decipher(msg):
     # Decipher by frequency
-    min_delta = 1000
-    best_rotation = 0
+    min_delta, best_rotation = 20, 0.0
     freq = frequency(msg)
-    for key in range(26):
-        d = delta(freq, FREQ_ENGLISH)
+    for k in range(26):
+    	d = delta(freq[k:] + freq[:k], FREQ_ENGLISH)
         if d < min_delta:
             min_delta = d
-            best_rotation = key
+            best_rotation = k
     return cipher(msg, -best_rotation)
 
 
@@ -74,12 +71,17 @@ def decipher_simple(msg):
 
 if __name__ == '__main__':
 
+    # creating a cipher
     key = 13
     text = 'hacker school is awesome!'
-    cip = cipher(text, key)
-    dec = decipher(cip)
+    cipe = cipher(text, key)
+    print "Cipher: " + cipe
+  
+    # decyphering
+    with open('cipher.txt', 'r') as f:	
+	cip = f.readlines()
+	cip = cip[0].strip()
+        cipe =  decipher(cip)    	  	
+    	print "Decipher: " + cipe
 
-    print "Cipher: " + cip
-    print "Decipher: " + dec
-
-    assert(text == dec)
+