All envelopes that do not contain administrative information must have a company-defined keyword. This keyword is used to encrypt files in the browser before sending them and repetition is required, as well as the mandatory download of a file that includes all defined keywords, to enable the offer to close .

It is very important to have custody of these keywords, since once the submission deadline has passed, they will be required by the contracting authority.

The keyword must be between 8 and 32 characters long and must contain at least one character from each of the following groups: numeric, alphabetic, and special characters (*, +, $, &, #, @, -, !, %, ^, *, ;, (, ), {, }, [, ], <,
>, ?, /,_).