题目如下:
Assume Bob,using the RSA cryptosystem,selects p = 11,q = 13 and d= 7,which
of the following can be the value of public key e ?
a)11, b)103, c)19, d)77, e)31,
想法:有google过RSA加密，但还是有点雾煞煞
跪求强者教学@@ 谢谢!

必须要 ed = 1 (mod pq)呃不是 pq, 是 φ(pq)

楼上意思是ed = (modφ(pq)) @@?好像懂了，我算出来是b)103