What is a .CDOC file?
A .CDOC file is a special kind of digital document that is protected by a strong lock to keep its contents safe. This type of file is made using a program called qDigiDoc, which is a free tool anyone can download. This program is especially important in Estonia and Finland because it works with the ID cards given out by the government in these countries. It helps make sure that documents signed with these ID cards are really from who they say they are.
Inside a .CDOC file, you can find different kinds of files like text documents (.DOC), spreadsheets (.XLS), PDFs (.PDF), and more. These files are locked up tight using a method called AES-128 encryption. This means that the information inside the .CDOC file can only be read by someone who has the right key to unlock it. Along with the locked file, there's also a special key inside the .CDOC file that helps unlock the information, but this key is also protected so that only the intended receiver can use it. There's also a certificate that shows who the file is for, and some extra details about the file.
To open a .CDOC file, you need to use the qDigiDoc program. This program is not just for opening these files; it can also be used to put a digital signature on documents. This is like signing a paper document, but it's done on the computer and it's very secure. This is helpful for people who need to sign official documents digitally using their ID card or a mobile ID.
The .CDOC file format is part of a bigger family of secure document formats called DigiDoc, which includes other types like .DDOC and .BDOC. These formats are all about keeping digital documents safe and making sure they are really from who they say they are.
The .CDOC format was created by the Information System Authority of Estonia, also known by its Estonian name, Riigi Infosüsteemi Amet (RIA). This organization is in charge of making sure the government's digital services in Estonia are safe and work well.
In summary, if you have a .CDOC file, you need the qDigiDoc program to open it. This program helps make sure that the document is safe and comes from the right person. It's a very important tool for people in Estonia and Finland for handling official documents securely.
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