The phrase "an encrypted phone" is correct and usable in written English.
You can use it when referring to a mobile device that has encryption features to protect data and communications.
Example: "For enhanced security, I decided to purchase an encrypted phone to safeguard my personal information."
Alternatives: "a secure phone" or "a privacy-focused phone."
When Mr. Zimmermann introduced the Zfone, an encrypted phone technology, N.S.A. analysts circulated the announcement in an e-mail titled "This can't be good".
Hours later, the Islamic State, also known as ISIS or ISIL, claimed responsibility in a statement released over an encrypted phone app used by the group.
But of course, if you want to enter into encryption, you need to have a partner with the other side that also has an encrypted phone.
Asked what would happen next, he replied: "Basically if I placed him, I would get £50,000". Mr McMillan claimed he was given an encrypted phone to message those involved.
They also have an encrypted phone line.
It's worth noting that making an encrypted phone call — or sending an encrypted email — requires the use of two encrypted devices/clients: both your own phone/email client and the phone/email client of the person you're talking to.
The "Crypto War" had started in 1993 when the US National Security Agency persuaded the new Clinton administration to try to bully US firms into encrypting data using the Clipper chip, a device containing a back-door key to let the NSA decipher any encrypted phone call or email just as easily as the intended recipient.
For government business, she has a pricey encrypted phone.
With founders including Phil Zimmermann, who devised the Pretty Good Privacy PGPP) email encryption product, and a former Navy Seal, Silent Circle offers a series of encrypted phone apps and a Skype-style internet chat platform.
Starting April 1, you can see them as part of Ways to Be Private, a display that also includes a military-grade encrypted phone called the CryptoPhone 500, a selfie stick with a remote shutter release, and, according to The Guardian, a "USB condom". .
The service will be run by Deutsche Telekom's enterprise unit T-Systems in co-operation with Germany's Sichere Mobile Kommunikation mbH (GSMK), a provider of encrypted phone services and devices.
