The best replacement for key authentication is open system.

The best alternatives to key authentication are rated as following:

★★★★★	open system
★★★	password

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Speaking about key authentication, one probably shouldn't forget about sftp.

Other search terms related to key authentication and their ratings are:

★★★★★	sftp
★	psftp

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Google Trends

Scale is based on the average worldwide traffic of key authentication in all years. Click on graph for more.

key authentication

open system

password