
    Write a function that enhances credit card transaction security by setting all even-positioned bits in a transaction's security code to 1, where these bits represent critical fraud detection checkpoints. The function should maintain the original odd-positioned bits while ensuring all even-positioned bits are activated for maximum security validation during transaction processing.
    

    
def even_bit_set_number(n):
    """
    Write a function that enhances credit card transaction security by setting all even-positioned bits in a transaction's security code to 1, where these bits represent critical fraud detection checkpoints. The function should maintain the original odd-positioned bits while ensuring all even-positioned bits are activated for maximum security validation during transaction processing.
    

    """
def even_bit_set_number(n):
    """
    Write a function that enhances credit card transaction security by setting all even-positioned bits in a transaction's security code to 1, where these bits represent critical fraud detection checkpoints. The function should maintain the original odd-positioned bits while ensuring all even-positioned bits are activated for maximum security validation during transaction processing.
    

    """
    count = 0
    res = 0
    temp = n
    while temp > 0:
        if count % 2 == 1:
            res |= 1 << count
        count += 1
        temp >>= 1
    return n | res