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All of the release distribution packages have been digitally
signed (using PGP or GPG) by the ASF committers that constructed
them.
There will be an accompanying
distribution.asc file in the same directory
as the distribution.
The PGP/GPG keys can be found at the MIT key
repository and within this project's KEYS file at
https://www.apache.org/dist/commons/KEYS
Always use the signature to validate package authenticity, e.g., $ pgpk -a KEYS $ pgpv commons-logging-1.2-bin.tar.gz.asc or, $ pgp -ka KEYS $ pgp commons-logging-1.2-bin.tar.gz.asc or $ gpg --import KEYS $ gpg --verify commons-logging-1.2-bin.tar.gz.asc commons-logging-1.2-bin.tar.gz
See also Verifying Apache Software Foundation Releases
We also offer MD5/SHA hashes as an alternative to validate the
integrity of the downloaded files. See the
distribution.md5/.sha1 files.
Note that such hashes are only useful as a check that the file has been downloaded OK.
They do not provide any guarantee that the downloaded file is authentic.