Question

我正在尝试使用DSA（DSS）在Sage中对测试邮件进行数字签名。运行我的代码后，我得到：

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "_sage_input_28.py", line 10, in <module>
    exec compile(u'open("___code___.py","w").write("# -*- coding: utf-8 -*-\\n" + _support_.preparse_worksheet_cell(base64.b64decode("IyBDaGVjayB0aGUgc2lnbmF0dXJlCmNoZWNrX3NpZyhtLHAscSxnLHIscyx5KQ=="),globals())+"\\n"); execfile(os.path.abspath("___code___.py"))
  File "", line 1, in <module>

  File "/tmp/tmpUuKk65/___code___.py", line 3, in <module>
    exec compile(u'check_sig(m,p,q,g,r,s,y)
  File "", line 1, in <module>

  File "/tmp/tmppjN9Gi/___code___.py", line 7, in check_sig
    u_2 = mod(r*w,q)
  File "element.pyx", line 1701, in sage.structure.element.RingElement.__mul__ (sage/structure/element.c:14531)
  File "coerce.pyx", line 856, in sage.structure.coerce.CoercionModel_cache_maps.bin_op (sage/structure/coerce.c:8169)
TypeError: unsupported operand parent(s) for '*': 'Ring of integers modulo 98007532214006523718033513010741500921668410005086660781341579786663143142637' and 'Ring of integers modulo 44449'

违规行是：u_2 = mod(r*w,q)。我认为这里的问题是我将r和w相乘：

r = mod(mod(g^k,p),q)
w = mod(1/s,q)

但是，这些都是mod q。为什么我不能对它们进行乘法运算？我必须做某种演员吗？

以下是完整（仍然很小）sage表的链接：http://i.imgur.com/dX7PKHi.png

在SAGE中执行两个整数环（具有不同的mod）之间的算术运算

0 个答案: