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Raw TCP/IP networking is dangerous for two reasons:
Transport Layer Security (TLS) and its predecessor Secure Socket Layer (SSL), which are both often collectively called SSL, solve both problems. SSL uses:
SSL allows agents to talk in private and create secure web services.
library(ssl) library provides an API to
turn a pair of arbitrary Prolog wire streams into SSL powered
encrypted streams. Note that secure protocols such as secure HTTP simply
run the plain protocol over (SSL) encrypted streams.
library(crypto) library provides additional
predicates related to cryptography and authentication, secure hashes and
Cryptography is a difficult topic. If you just want to download documents from an HTTPS server without worrying much about security, http_open/3 will do the job for you. As soon as you have higher security demands we strongly recommend you to read enough background material to understand what you are doing. See section 5 for some remarks regarding this implementation. This The Linux Documentation Project page provides some additional background and tips for managing certificates and keys.