We post all questions about web site design and development on the Web Site Design by Galganov FAQs page. This is a rather complicated question. Early keys were a challenge for early burglars. The better a burglar got the more the key was improved. The more the key was improved the better the burglar had to get.
Encryption is much the same.
Essentially, security, using sufficient encryption, is quite satisfactory. It is no worse than, for example, giving your credit card to your local merchant. Obviously, you make money on the Internet by providing a service or product that Internet surfers value. Finding this product or service is the difficult part. In addition to finding it, you must also have a good understanding of this service or product.