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PhCyber Servers are hosted by the well known and trusted company DigitalOcean.

DigitalOcean, Inc. is an American cloud infrastructure provider headquartered in New York City with data centers worldwide. DigitalOcean provides developers cloud services that help to deploy and scale applications that run simultaneously on multiple computers. As of January 2018, DigitalOcean was the third-largest hosting company in the world in terms of web-facing computers.


OpenVPN is open-source commercial software that implements virtual private network (VPN) techniques to create secure point-to-point or site-to-site connections in routed or bridged configurations and remote access facilities. It uses a custom security protocol that utilizes SSL/TLS for key exchange.


TCP Transmission control protocol (TCP) is the most common protocol used on the internet. It is connection oriented, meaning, data can be sent bidirectionally once a connection is established.[1] Transmission Control Protocol is more commonly used than the User Datagram Protocol (UDP). Unlike UDP, it includes an automatic error checking system to ensure that each packet is delivered, as requested. The User Datagram Protocol, on the other hand, does not provide such a system that requires the acknowledgment that packet transmission was successful. This built-in error checking, although more efficient, makes it slower than UDP since it prioritizes the accurate delivery of data between systems.


UDP is a communication protocol used across the Internet for especially time-sensitive transmissions such as video playback or DNS lookups. It speeds up communications by not requiring what’s known as a “handshake”, allowing data to be transferred before the receiving party agrees to the communication. This allows the protocol to operate very quickly, and also creates an opening for exploitation.


Stunnel is a proxy designed to add TLS encryption functionality to existing clients and servers without any changes in the programs' code. Its architecture is optimized for security, portability, and scalability (including load-balancing), making it suitable for large deployments. Stunnel uses the OpenSSL library for cryptography, so it supports whatever cryptographic algorithms are compiled into the library. It can benefit from the FIPS 140-2 validation of the OpenSSL FIPS Object Module, as long as the building process meets its Security Policy. A scanned FIPS 140-2 Validation Certificate document is available for download on the NIST web page. The OpenSSL FIPS 140-2 module is currently only available for OpenSSL 1.0.2. FIPS-enabled Windows installers of stunnel are available on request with our customer support plans.