import math def transpostionEncrypt(msg,key):#加密size = len(msg)result = []for i in range(key):t = iwhile t<size:result.append(msg[t])t+=keyreturn ''.join(result) def transpostionDecrypt(msg,key):#解密numOfColums = int(math.ceil(len(msg)/float(key)))numOfRows = keysharedBox = numOfColums*numOfRows - len(msg)row = 0col = 0result = ['']*numOfColumsfor i in msg:result[col] += icol+=1if col==numOfColums or (col==numOfColums-1 and row>=numOfRows-sharedBox):col=0row+=1return ''.join(result)def main():cipher = transpostionEncrypt("Common sense is not so common.",8)print cipher#密文print transpostionDecrypt(cipher,8) if __name__=="__main__":main()

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