Updating gpg key ubuntu
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Public key cryptography is based on pairs of keys, a public key and a private key.
For example, that directory could contain the following files: or Here's how it looks during an apt-get update: If you say Y here you have no way to know if the file you're getting is the package you're supposed to install, or if it's something else entirely that a black hat has arranged for you, containing a nasty surprise.It's also worth noting that newer versions of the Debian installer use the same signed Release file mechanism during their debootstrap of the Debian base system, before apt is available, and that the installer even uses this system to verify pieces of itself that it downloads from the net.None of this is new in secure apt, but it does provide the foundation.Notice that so far there is one file that apt doesn't have a way to check: The Release file.For details on the format of the files Debian repositories please refer to the Repository Format page.
For detailed information on commands please refer to the man pages of the tools.
A secure hash function (a type of checksum) is a method of taking a file and boiling it down to a reasonably short number that will uniquely identify the content of the file, even if people are deliberately trying to create a pair of different files with the same checksum or create a new file that matches a previous checksum.
APT was originally designed around MD5 but people have since managed to construct collisions and so support for newer hash functions has been added.
To check the signature, it has to know the public key of the person who signed the file.
These keys are kept in apt's own keyring (/etc/apt/trusted.gpg), and managing the keys is where secure apt comes in.
However care should be taken with key IDs, especially the short 8 character ID as it is possible to generate collisions.