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The word 'encrypted' is correct and usable in written English.
You can use it to describe when data or information has been encoded so that only authorized individuals or groups can access or view it. For example, "All communication channels in our organization are encrypted for security purposes."
Dictionary
encrypted
verb
Past of encrypt
Exact(59)
Its controversial elements include the ability of the police and others to demand the release of "keys" (ranging from simple passwords to complicated encryption techniques) to electronically encrypted material.
They can also get their hands on encryption keys which can be used to decipher encrypted traffic flowing to and from the computer.
Miranda was serving as a human passenger pigeon, shuttling encrypted files on USB drives between filmmaker Laura Poitras and Greenwald because, as the whole world now knows, the Internet is fully bugged by the US and UK governments.
The app – which is free – adds a time-stamp and GPS-fixed location to recorded images which can then be encrypted and uploaded later to the system's databanks from anywhere in the world.
New techniques were developed to access the masses of research material Barot had encrypted and hidden within computer files but police admit there are still codes they have not cracked and gaps in their knowledge about Barot's movements over the past 10 years.
With the launch of iOS 8, "the information stored on many iPhones and other Apple devices will be encrypted by default", Comey told the Brookings Institute in Washington DC last year.
Mail could be encrypted – using public keys in a web of trust – within users' own computers, in their browsers; email at rest at Gmail could be encrypted using algorithms to which the user, rather than Google, has the relevant keys.
A snippet: A senior editor and a Guardian computer expert used angle grinders and other household tools to pulverise the hard drives and memory chips on which the encrypted files had been stored.
Hushmail is a great place to start – it's a free (but limited, unless you subscribe) Pretty Good Privacy (PGP) encrypted webmail service, with no third-party advertising sneakily harvesting details from your account in an attempt to push more relevant or personalised ads your way.
He pointed out that if an encrypted email is sent from an infected source (such as a computer), the malware spreads.
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The explosion of often-encrypted new means of communication, from Skype to gaming forums to WhatsApp, has made surveillance far more technically demanding and in some instances close to impossible.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com