Brute forcing from CTFing time. (Mine is 1534487873)
```import calendarimport time
PI = [58, 50, 42, 34, 26, 18, 10, 2,          60, 52, 44, 36, 28, 20, 12, 4,          62, 54, 46, 38, 30, 22, 14, 6,          64, 56, 48, 40, 32, 24, 16, 8,          57, 49, 41, 33, 25, 17, 9, 1,          59, 51, 43, 35, 27, 19, 11, 3,          61, 53, 45, 37, 29, 21, 13, 5,          63, 55, 47, 39, 31, 23, 15, 7]
CP_1 = [57, 49, 41, 33, 25, 17, 9,                1, 58, 50, 42, 34, 26, 18,                10, 2, 59, 51, 43, 35, 27,                19, 11, 3, 60, 52, 44, 36,                63, 55, 47, 39, 31, 23, 15,                7, 62, 54, 46, 38, 30, 22,                14, 6, 61, 53, 45, 37, 29,                21, 13, 5, 28, 20, 12, 4]
CP_2 = [14, 17, 11, 24, 1, 5, 3, 28,                15, 6, 21, 10, 23, 19, 12, 4,                26, 8, 16, 7, 27, 20, 13, 2,                41, 52, 31, 37, 47, 55, 30, 40,                51, 45, 33, 48, 44, 49, 39, 56,                34, 53, 46, 42, 50, 36, 29, 32]E = [32, 1, 2, 3, 4, 5,         4, 5, 6, 7, 8, 9,         8, 9, 10, 11, 12, 13,         12, 13, 14, 15, 16, 17,         16, 17, 18, 19, 20, 21,         20, 21, 22, 23, 24, 25,         24, 25, 26, 27, 28, 29,         28, 29, 30, 31, 32, 1]
S_BOX = [
[[14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7], [0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8], [4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0], [15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13],],[[15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10], [3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5], [0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15], [13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9],],[[10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8], [13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1], [13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7], [1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12],],[[7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15], [13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9], [10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4], [3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14],],[[2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9], [14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6], [4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14], [11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3],],[[12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11], [10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8], [9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6], [4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13],],[[4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1], [13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6], [1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2], [6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12],],
[[13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7], [1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2], [7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8], [2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11],]]
P = [16, 7, 20, 21, 29, 12, 28, 17,         1, 15, 23, 26, 5, 18, 31, 10,         2, 8, 24, 14, 32, 27, 3, 9,         19, 13, 30, 6, 22, 11, 4, 25]
PI_1 = [40, 8, 48, 16, 56, 24, 64, 32,                39, 7, 47, 15, 55, 23, 63, 31,                38, 6, 46, 14, 54, 22, 62, 30,                37, 5, 45, 13, 53, 21, 61, 29,                36, 4, 44, 12, 52, 20, 60, 28,                35, 3, 43, 11, 51, 19, 59, 27,                34, 2, 42, 10, 50, 18, 58, 26,                33, 1, 41, 9, 49, 17, 57, 25]
SHIFT = [1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1]def string_to_bit_array(text):        array = list()        for char in text:                binval = binvalue(char, 8)                array.extend([int(x) for x in list(binval)])        return arraydef bit_array_to_string(array):        res = ''.join([chr(int(y,2)) for y in [''.join([str(x) for x in bytes]) for bytes in  nsplit(array,8)]])        return resdef binvalue(val, bitsize):        binval = bin(val)[2:] if isinstance(val, int) else bin(ord(val))[2:]        if len(binval) > bitsize:                raise "binary value larger than the expected size"        while len(binval) < bitsize:                binval = "0"+binval        return binvaldef nsplit(s, n):        return [s[k:k+n] for k in xrange(0, len(s), n)]ENCRYPT=1DECRYPT=0class des():        def __init__(self):                self.password = None                self.text = None                self.keys = list()
        def run(self, key, text, action=ENCRYPT, padding=False):                if len(key) < 8:                        raise "Key Should be 8 bytes long"                elif len(key) > 8:                        key = key[:8]
                self.password = key                self.text = text
                if padding and action==ENCRYPT:                        self.addPadding()                elif len(self.text) % 8 != 0:                        raise "Data size should be multiple of 8"
                self.generatekeys()                text_blocks = nsplit(self.text, 8)                result = list()                for block in text_blocks:                        block = string_to_bit_array(block)                        block = self.permut(block,PI)                        g, d = nsplit(block, 32)                        tmp = None                        for i in range(16):                                d_e = self.expand(d, E)                                if action == ENCRYPT:                                        tmp = self.xor(self.keys[i], d_e)                                else:                                        tmp = self.xor(self.keys[15-i], d_e)                                tmp = self.substitute(tmp)                                tmp = self.permut(tmp, P)                                tmp = self.xor(g, tmp)                                g = d                                d = tmp                        result += self.permut(d+g, PI_1)                final_res = bit_array_to_string(result)                if padding and action==DECRYPT:                        return self.removePadding(final_res)                else:                        return final_res
        def substitute(self, d_e):                subblocks = nsplit(d_e, 6)                result = list()                for i in range(len(subblocks)):                        block = subblocks[i]                        row = int(str(block[0])+str(block[5]),2)                        column = int(''.join([str(x) for x in block[1:][:-1]]),2)                        val = S_BOX[i][row][column]                        bin = binvalue(val, 4)                        result += [int(x) for x in bin]                return result
        def permut(self, block, table):                return [block[x-1] for x in table]
        def expand(self, block, table):                return [block[x-1] for x in table]
        def xor(self, t1, t2):                return [x^y for x,y in zip(t1,t2)]
        def generatekeys(self):                self.keys = []                key = string_to_bit_array(self.password)                key = self.permut(key, CP_1)                g, d = nsplit(key, 28)                for i in range(16):                        g, d = self.shift(g, d, SHIFT[i])                        tmp = g + d                        self.keys.append(self.permut(tmp, CP_2))        def shift(self, g, d, n):                return g[n:] + g[:n], d[n:] + d[:n]
        def addPadding(self):                pad_len = 8 - (len(self.text) % 8)                self.text += pad_len * chr(pad_len)
        def removePadding(self, data):                pad_len = ord(data[-1])                return data[:-pad_len]
        def encrypt(self, key, text, padding=False):                return self.run(key, text, ENCRYPT, padding)
        def decrypt(self, key, text, padding=False):                return self.run(key, text, DECRYPT, padding)
if __name__ == '__main__':        '''        IV = str(calendar.timegm(time.gmtime()))[-8:]        message= "######  redacted  ######"        d = des()        r = d.encrypt(IV,d.encrypt(IV,d.encrypt(IV,message)))        print ("Ciphered: %r" % r)        '''        i = int(time.time()) % 100000000  # 1534487873        d = des()        ct = '|\xb3Wm\x83\rE7h\xe3\xc0\xf1^Y\xf0\x8d\xa6I\x92\x9b\xa5\xbc\xdc\xca\x9d\xcd\xe9a0\xa3\x00\xf2\x13\x16]|\xae\xd8\x84\x88'        while i > 0:                IV = str(i).zfill(8)                pt = d.decrypt(IV, d.decrypt(IV, d.decrypt(IV, ct)))                if pt.find('d4rk') >= 0:                        print 'found!', [IV, pt]                        exit()                i -= 1                if i % 100 == 0:                        print i    # found! ['34455973', 'd4rk{0h_lol_t1m3_i5_n0t_A_g00d_s33d}c0de']```