아...그 뭐였더라..

import java.math.BigInteger; public class RSAHW { public static void main(String[] args) { BigInteger n = new BigInteger("3174654383"); BigInteger e = new BigInteger("65537"); BigInteger C = new BigInteger("2487688703"); BigInteger p = n; BigInteger q = new BigInteger("2"); BigInteger pi; // (p-1)*(q-1) BigInteger k = new BigInteger("1"); BigInteger d, M; while(p.compareTo(q)==1) { //p>q if(p.mo..

import java.util.Base64; import javax.crypto.*; import javax.crypto.spec.*; public class Security_HW2 { static String key = "8iE3bf1se6N76HGPP8S0Xw=="; static String iv = "cHml3oX848/0uBwDJtChOA=="; static byte[] decKey = Base64.getDecoder().decode(key); //디코딩된 key static byte[] decIv = Base64.getDecoder().decode(iv); //디코딩된 iv public static String decode(String str) throws Exception { SecretKey..

#include #include void count(int len, char str[],int cnt[]); //알파벳 횟수 계산 void rank(int cnt[], int rnk[]); //rnk는 빈도수로 계산한 순위 void replace(char str[]); void print(int cnt[], int rnk[],char str[]); int main() { char str[1600] = "APS ZU BMS THAAMT KB SOP CHAAPJ MQ LPUWHKX. K UHJ SM JMZ SMLHJ VJ QXKPBLU -- UM PCPB SOMZDO TP QHEP SOP LKQQKEZASKPU MQ SMLHJ HBL SMVMXXMT, K USKAA OHCP H LXPHV. KS KU H L..