Unfortunately the term "Secure Anonymous Proxy" is very misleading and is wrong on several points. There is no such thing as an anonymous or secure proxy.
Proxies are usually setup by hackers or even by police/government agencies to monitor illegal activities and/or harvest your passwords and financial information. Remember that whoever is running such a proxy can see all the traffic going through it and also who you are. It is very easy to identify someone even if they are using what they believe is an anonymous/secure proxy.
Secure Anonymous Proxies simply do not exist, even if they use SSL it still is very weak security and still doesn't prevent the owner of the proxy from seeing your passwords and other sensitive data.
The other issue with so called a so-called Secure and Anonymous Proxy is that they are always overloaded, unreliable and slow.
As you can see, it makes little sense to use a proxy, because you are not anonymous and you are far less secure than you could imagine when using such a proxy.
Instead get a fast, quick, secure and anonymous VPN account which will also be much more reliable for you.