Problem reading from a file in C

programming
1

Hey Guys, I have been trying to get a grasp on this but it is going over my head. I am writing a program in C to use Vigenere Cipher to encrypt and decrypt words in a file using an ecryption key. I just started and I compile fine but I get a seg fault at like 46 which is
cipher[x][j]= fgetc(fp);

Any help on why I am getting a sef fault would be awesome. I basically want to take the contents of my file and read in character by character into a two dimensional array. The file I am reading is also posted below the code.

 
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

char getKey();
char loadCipher(char [][500],FILE *);

int main(int argc, char *argv[])
{
    FILE *fp;
    char original[80];
    char key[80];
    char cipher[500][500];
    
    if(argc !=3)
    {
        puts("You must enter two files at command prompt as arguments");
        return -1;
    }

    getKey(key);
    //puts("Encryption Key: ");
    //scanf("%s", key);
    //printf("key: %s", key);
    fp = fopen("cipher.txt", "r");
    loadCipher(cipher, fp);
    
    return 0;

}    
char getKey(char key[])
{
    puts("Encryption Key: ");
    scanf("%s", key);
}
char loadCipher(char cipher[][500],FILE *fp)
{
    int x,j,test;
    //do
    //{
        for(x=0;x<26;x++)
        {
            for(j=0;j<26;j++)
            {
                if(!feof(fp))
                    cipher[x][j]= fgetc(fp); 
            }
        }
    //}while(fgetc(fp)!= EOF);    
}


0,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z
A,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z
B,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,A
C,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,A,B
D,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,A,B,C
E,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,A,B,C,D
F,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,A,B,C,D,E
G,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,A,B,C,D,E,F
H,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,A,B,C,D,E,F,G
I,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,A,B,C,D,E,F,G,H
J,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,A,B,C,D,E,F,G,H,I
K,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,A,B,C,D,E,F,G,H,I,J
L,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,A,B,C,D,E,F,G,H,I,J,K
M,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,A,B,C,D,E,F,G,H,I,J,K,L
N,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,A,B,C,D,E,F,G,H,I,J,K,L,M
O,O,P,Q,R,S,T,U,V,W,X,Y,Z,A,B,C,D,E,F,G,H,I,J,K,L,M,N
P,P,Q,R,S,T,U,V,W,X,Y,Z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O
Q,Q,R,S,T,U,V,W,X,Y,Z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P
R,R,S,T,U,V,W,X,Y,Z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q
S,S,T,U,V,W,X,Y,Z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R
T,T,U,V,W,X,Y,Z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S
U,U,V,W,X,Y,Z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T
V,V,W,X,Y,Z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U
W,W,X,Y,Z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V
X,X,Y,Z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W
Y,Y,Z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X
Z,Z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y

Thanks in advance.