What the security implications of cryptocurrency and are they being managed?

Cryptocurrencies, typically created using blockchain technologies, are available in digital form only and provide a different way of trading that is generally presented as being ultra-secure, but is it? After all we know that the wallets cryptocurrencies are stored in can be stolen if passwords are not secured. If the cryptocurrencies are kept on centralised exchanges they can be hacked a problem because for now this is the easiest way of doing business. Moreover, there are so many fraudulent...