The phrase 'covert method' is correct and can be used in written English.
It typically refers to an approach or method that is done in secrecy. For example, "The team carried out the investigation using a covert method to ensure they were not detected."
-The last (and most covert) method for destroying a RFID tag is to hit it with a hammer.
Though the comments themselves appeared nonsensical and spammy, they represented a more covert method of laying an activation code without attracting the attention of internal security systems.
This covert method of newsgathering amplifies any accusations we make.
In that covert method, a peripheral cue is presented so briefly that a saccade is not initiated.
Could this covert method be one of the reasons that GPs are not particularly successful in identifying children with psychosocial problems [ 8, 9]?
"However, a few nations are now proposing surreptitious and covert methods for obtaining private keys and access to encoded communications".
We need assurances that phone-hacking and other covert methods were not used during the last few elections.
Intelligence sharing and other non-violent covert methods of assisting rebels and helping end fighting are useful tools.
While the missions they would take up would be secret, the intelligence units would not use covert methods like false identities or nationalities, the senior military officer said.
It seems a contradiction, even hypocritical, for the United States to have promoted the Western values of free elections, free speech, and free markets by covert methods.
When the enemy sees that he has failed in overt action, he turns to covert methods: alcohol, women, music, religion, hermetic poetry, fashion.
