DNSCrypt (https://dnscrypt.org/) and I'd like to know whether it's useful to mask/hide from my
HTTP requests I make in my browser.
And how does it protect me?
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... whether it's useful to mask/hide from my ISP (Telecom) the HTTP requests I make in my browser.
From the homepage of dnscrypt:
Please note that DNSCrypt is not a replacement for a VPN, as it only authenticates DNS traffic, and doesn't prevent "DNS leaks", or third-party DNS resolvers from logging your activity.)
Thus the answer to your question is: NO, it does not hide the DNS requests from your ISP. DNSCrypt is not a privacy tool but only prevents spoofing of DNS responses.