题目内容

#include "stdio.h"int main(){ int a[4][4]={{1,2,3,4},{5,6,7,8},{3,9,10,2},{4,2,9,6}};int i,s=0;for(i=0;i<4;i++)s+=a[i][1];printf("%d\n",s);return 0;}则程序段的输出结果为: 。

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下列程序段执行后的输出结果是 。#include int main(){char a[2][4];strcpy(a,"you");strcpy(a[1],"me");a[0][3]='&';printf("%s\n",a);return 0;}

1. Private key algorithm vs. public key algorithm? (Com-pare their computation complexity, security, and usage.)

2. How can we combine the private key algorithm andthe public key algorithm?

3. Where do we use transport-mode IPSec and tunnel-mode IPSec, respectively? What parts o the packetsdo they encrypt?

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