The following changes add more security features to Entropy repository
files. Every package will have new security metadata associated, like
sha256 and mtime of package files. Once all packages will contain
such information, the feature can be used, for example, to determine
if a system has been compromised by changing critical executables.
This is not a replacement for rootkit tools such as rkhunter or chkrootkit,
but instead, the base support for their file checking mechanism.
Entropy Client support (equo, mainly) is planned in the near future.
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