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ȨÀ¸·Î


¹®ÀÚ¿­ ÀÎÄÚµù - µðÄÚµù ÇÕ´Ï´Ù
19³â Àü
<script language="javascript">
<!--
// ¾Ïȣȭ½Ã »ç¿ëÇÏ´Â ¹®ÀÚ
var char_set = '$%^NOZ1&PQR(./~`"CDEFG!@STUVWZghij}:<pHB*#8uvwx>?[]\',ef34590qrklmnoIJ)_+{st67 abcdAyzKLM2Y';

function crypt_data(crypt_type) {
        var space;
        var char_code;
        var output = "";
        var input = window.input.input_field.value;
        var algorithm = window.input.shift_select.selectedIndex;
        var alpha_length = char_set.length - algorithm;

        algorithm++;

        for(loop=0; loop<input.length; loop++) {
                if(char_set.indexOf(input.charAt(loop)) == -1) {
                        // ¿ø¹® : Program Error: Unknown Character!
                        alert("¿À·ù : Character¸¦ ¾Ë ¼ö ¾ø½À´Ï´Ù.");
                }

                char_code = char_set.indexOf(input.charAt(loop));

                // ÀÎÄÚµù ¸í·É
                if(crypt_type == "encrypt") {
                        if(char_code + algorithm > char_set.length) {
                                space = char_set.length - char_code;
                                char_code = algorithm - space;
                        } else {
                                char_code += algorithm;
                        }
                } else
                // µðÄÚµù ¸í·É
                if(crypt_type == "decrypt") {
                        if(char_code - algorithm < 0) {
                                space = algorithm - char_code;
                                char_code = char_set.length - space;
                        } else {
                                char_code -= algorithm;
                        }
                }
                output += char_set.charAt(char_code);
        }
        window.input.input_field.value = output;
}
//-->
</script>


<center>

<form name="input">
<TEXTAREA name="input_field" cols="70" rows="15"></TEXTAREA><br>

<b>Key : </b>
<select name="shift_select">
<option>1
<option>2
<option>3
<option>4
<option selected>5
<option>6
<option>7
<option>8
<option>9
</select>

<input type="button" value="EnCrypt" onclick="crypt_data('encrypt');">
<input type="button" value="DeCrypt" onclick="crypt_data('decrypt');">
</form>

</center>
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