Use zip/rar. With rar you can use password protection.

Along with content provide these files:

 * .nfo - crack team logo, info about content, enjoy greeting.

 * .url - internet shortcut file.

 * FILE_ID.DIZ - plain text file containing brief content description of the

   archive in which it is included.

Old .nfo use code page 437. New .nfo file use ISO-8859-1/ISO-8859-15 or

Unicode UTF-8 characters.

  http://en.wikipedia.org/wiki/.nfo

Internet shortcut file. Content like this:

  [InternetShortcut]

  URL=http://example.com/

  http://www.cyanwerks.com/file-format-url.html

FILE_ID stands for "file identification". DIZ stands for Description In

Zipfile.

  http://www.textfiles.com/computers/fileid.txt

  http://en.wikipedia.org/wiki/FILE_ID.DIZ

A crack intro, also known as a cracktro, loader, or just intro, is a small

introduction sequence added to cracked software, designed to inform the user

of which "cracking crew" or individual cracker was responsible for removing

the software's copy protection and distributing the crack.

  http://en.wikipedia.org/wiki/Crack_intro

  http://www.defacto2.net/cracktros.cfm