Exercicios Segurança

algoritmo-dh.js

const pAlice = 6, // Chave privada Alice
	pBob = 5, // Chave privada Bob
	primo = 23,
	a = 8;

// chaves secretas compartilhadas
let kBob, kAlice;

function main() {
	const compBob = gerarChaveCompartilhada(primo, pBob, a);
	const compAlice = gerarChaveCompartilhada(primo, pAlice, a);
	kAlice = calculaChaveSecretaCompartilhada(primo, compBob, pAlice);
	kBob = calculaChaveSecretaCompartilhada(primo, compAlice, pBob);
}

function gerarChaveCompartilhada(primo, privada, c) {
	return Math.pow(c, privada) % primo;
}

function calculaChaveSecretaCompartilhada(primo, publica, privada) {
	return Math.pow(publica, privada) % primo;
}

main();

const response = `Chaves: Bob: ${kBob} = Alice: ${kAlice}`;
console.log(response);
document.write(response);

algoritmo-random.js

const SIZE = 100;

let vetor = [],
	VetorFrequencia = {},
	rodadas = 0,
	valorAleatorio;

function getRandom() {
	return Number.parseInt(Math.random() * SIZE);
}

while (rodadas < SIZE * 1000) {
	valorAleatorio = getRandom();

	for (let i = 0; i < SIZE; i++) {
		vetor[i] = getRandom();
	}
	vetor.forEach(element => {
		if (element === valorAleatorio) {
			VetorFrequencia[valorAleatorio] = (VetorFrequencia[valorAleatorio] || 0) + 1;
		}
	});
	rodadas++;
}

console.log(VetorFrequencia);
document.write(`<pre>${JSON.stringify(VetorFrequencia, null, 4)}</pŕe>`);


// saída
{
    "0": 1075,
    "1": 987,
    "2": 979,
    "3": 1011,
    "4": 996,
    "5": 969,
    "6": 903,
    "7": 1029,
    "8": 1025,
    "9": 957,
    "10": 1018,
    "11": 1065,
    "12": 952,
    "13": 942,
    "14": 1020,
    "15": 1047,
    "16": 993,
    "17": 1091,
    "18": 987,
    "19": 941,
    "20": 961,
    "21": 988,
    "22": 1023,
    "23": 938,
    "24": 1020,
    "25": 1084,
    "26": 911,
    "27": 983,
    "28": 1024,
    "29": 1139,
    "30": 982,
    "31": 941,
    "32": 1010,
    "33": 975,
    "34": 987,
    "35": 1070,
    "36": 1074,
    "37": 990,
    "38": 1076,
    "39": 1009,
    "40": 1018,
    "41": 942,
    "42": 1029,
    "43": 1044,
    "44": 916,
    "45": 1001,
    "46": 1023,
    "47": 947,
    "48": 1002,
    "49": 1041,
    "50": 966,
    "51": 1036,
    "52": 952,
    "53": 1012,
    "54": 986,
    "55": 1012,
    "56": 1117,
    "57": 943,
    "58": 966,
    "59": 986,
    "60": 997,
    "61": 1059,
    "62": 1056,
    "63": 972,
    "64": 961,
    "65": 1002,
    "66": 957,
    "67": 1129,
    "68": 1114,
    "69": 1004,
    "70": 930,
    "71": 966,
    "72": 1044,
    "73": 1084,
    "74": 980,
    "75": 993,
    "76": 1051,
    "77": 1019,
    "78": 993,
    "79": 1024,
    "80": 968,
    "81": 1005,
    "82": 964,
    "83": 958,
    "84": 973,
    "85": 962,
    "86": 981,
    "87": 1012,
    "88": 890,
    "89": 989,
    "90": 992,
    "91": 974,
    "92": 1043,
    "93": 1053,
    "94": 989,
    "95": 996,
    "96": 977,
    "97": 981,
    "98": 958,
    "99": 1004
}