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Please visit the JMeter Website for more information.
Many of the files have been signed using GnuPG.
If so, there will be an accompanying file.asc signature file in the same directory as the file (binaries or source).
The signing keys can be found in the distribution directory at http://www.apache.org/dist/jmeter/KEYS.
Always test available signatures eg.
$ pgpk -a KEYS
$ pgpv jmeter-2.12.tar.gz.asc
$ pgp -ka KEYS
$ pgp jmeter-2.12.tar.gz.asc
$ gpg --import KEYS
$ gpg --verify jmeter-2.12.tar.gz.asc
JMeter 2.12 requires Java 6 or later