wechall->Crypto - Digraphs writeup

Good luck!

密文：cqzvftzijojqsweczyjqswtuzvftirqc wszvec hwivrajotdbsswivhw swcptuir loivirirjqziiv irecraraivirirmheczyzytdqc gyjqir ftzvsw swzvzv hwtumhmhturaeczysw ivtuswcpivjouc kujqir tuswxr gyivzyzyuc zizvzvhw ytzvezqc bpftswivjo swcptuir deivtdkuzvjohw jqir irzvzyecswtuzvftaw tuftmhmhftftjojqezezziftqc

#c = ‘cqzvftzijojqsweczyjqswtuzvftirqc wszvec hwivrajotdbsswivhw swcptuir loivirirjqziiv irecraraivirirmheczyzytdqc gyjqir ftzvsw swzvzv hwtumhmhturaeczysw ivtuswcpivjouc kujqir tuswxr gyivzyzyuc zizvzvhw ytzvezqc bpftswivjo swcptuir deivtdkuzvjohw jqir irzvzyecswtuzvftaw tuftmhmhftftjojqezezziftqc‘
c  = "aodrpqucxxrhawzpkyrhawyadrpqrtnf tadrzp zajginxxoigiawjgza awzeyart dpjgrtrtrhucjg rtzpininjgrtrtmkzpkykyoinf zhrhrt pqdraw awdrdr zayamkmkyainzpkyaw jgyaawzejgxxwe cgrhrt yaawfq zhjgkykywe ucdrdrza cfdrlpnf xkpqawjgxx awzeyart dejgoicgdrxxza rhrt rtdrkyzpawyadrpqrj ucrhmkmkdrmkdrucdpyazertnf"

dic = {}

def get_c_double_chars():
    c_dic = []
    i = 0
    while i < len(c):
        if c[i] == ‘ ‘:
            i += 1         #jump the space
            continue
        if c_dic.count(c[i:i+2]) == 0:
            c_dic.append(c[i:i+2])
        i += 2
    #dic = {c_dic[i]:chr(ord(‘a‘)+i) for i in range(len(c_dic))}
    dic.update({c_dic[i]:‘?‘ for i in range(len(c_dic))})
    #print(c_dic)
    print(dic)

get_c_double_chars()

def guess_dic(c_word,m_word):   #密文单词 c_word,  猜测的明文单词m_word
    for i in range(len(m_word)):
        j = i * 2
        dic[c_word[j:j+2]] = m_word[i]
    print(dic)

def transf_c():
    m = ‘‘
    i = 0
    while i < len(c):
        if c[i] == ‘ ‘:
            m += ‘ ‘
            i += 1
            continue
        m += dic[c[i:i+2]]
        i += 2
    print(c)
    print(m)

‘‘‘    
#猜测，第一个单词‘cqzvftzijojqsweczyjqswtuzvftirqc‘是 ‘congratulations!‘
结果:congratulations! ?ou ???r??t?? t?is ??ssag? su???ss?ull?! ?as not too ?i??i?ult ?it??r? ?as it? ??ll? goo? ?o?! ?nt?r t?is ????or? as solution? ga??o?og?i?s!
然后猜测其它单词

guess_list = [ [‘cqzvftzijojqsweczyjqswtuzvftirqc‘,‘congratulations!‘],
               [‘irzvzyecswtuzvftaw‘,‘solution‘],
               [‘wszvec‘,‘you‘],
               [‘irecraraivirirmheczyzytdqc‘,‘successfull‘],
               [‘hwivrajotdbsswivhw‘,‘decrypted‘],
               [‘swcptuir‘,‘this‘],
               [‘loivirirjqziiv‘,‘message‘],
               [‘gyjqir‘,‘was‘],
               [‘ytzvezqc‘,‘job‘],
              ]
‘‘‘
guess_list = [ [‘aodrpqucxxrhawzpkyrhawyadrpqrtnf‘,‘congratulations!‘],
             ]

for pair in guess_list:
     guess_dic(pair[0],pair[1])

transf_c()

wechall->Crypto - Digraphs writeup

原文：https://blog.51cto.com/whbill/2493904