Another Boring Encryption

import getpass
import time
import sys
class bin2ascii:
    def cal(self, asd):
        asd = asd.replace('0b', '')
        num = asd[::-1]
        MultOfTwo= [1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072]
        value= ''
        for i in range(len(num)):
            additives = int(num[i])* int(MultOfTwo[i])
            value += str(additives) + '+'
        else:
            value += '0'
            return eval(value)
b2a = bin2ascii()
class crypter:
    def __passys__(self):
        pas = getpass.getpass('')
        if pas != '1':
            print'Access Denied!'
            time.sleep(2)
            sys.exit()
        else:
            pass
    def __init__(self):
        print'Please enter the passcode:'
        self.__passys__()
        while True:
            print'What do you want to do: E = Encrypt / D = Decrypt / Q = Quit'
            choice = raw_input()
            if choice.startswith('e'):
                self.encrypt()
            elif choice.startswith('d'):
                self.decrypt()
            elif choice.startswith('q'):
                sys.exit()
            else:
                print'E = Encrypt / D = Decrypt / Q = Quit'
    def encrypt(self):
        OEtext = ''
        key = raw_input('Please input the key for the Encryprion: ')
        print'please input the text you wish to encrypt:'
        PText = raw_input()
        for letter in PText:
            FakeAsciiVal = ord(letter) + int(key)
            while FakeAsciiVal > 126:
                FakeAsciiVal -= 96
            BiVal = bin(FakeAsciiVal)
            BiVal = BiVal.replace('0b', '')
            OELetter = BiVal
            OELetter = OELetter.replace('1', '\'')
            OELetter = OELetter.replace('0', ',')
            OELetter += '`'
            OEtext += OELetter
        print'Your crypter text is :', OEtext
    def decrypt(self):
        key = raw_input('Please input the key for the Decryption: ')
        print'please input the text you wish to decrypt:'
        EText = raw_input()
        EText = EText.replace('\'', '1')
        EText = EText.replace(',', '0')
        EText = EText.replace(' ', '')
        ELetter = ''
        DText = ''
        for EByte in EText:
            if EByte != '`':
                ELetter += EByte
            else:
                EWord = ELetter[:]
                b2a = bin2ascii()
                code = int(b2a.cal(EWord)) - int(key)
                while code  < 32:
                    code += 96
                DText += chr(code)
                EWord = ''
                ELetter = ''
        print DText





if __name__ == '__main__':
    crypter()
else:
    pass