Dear Dar: I dont find MD5() function in Revolution for Windows.
Cordialmente, Alvaro Abril Tecnología Divertia S.A. www.fantasticguatemala.com Tel. 502 2410 4600 Fax.502 2410 4646 Guatemala -----Mensaje original----- De: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] En nombre de Dar Scott Enviado el: Jueves, 21 de Septiembre de 2006 03:05 p.m. Para: How to use Revolution Asunto: Re: Security using .exe applications and external files. Importancia: Alta On Sep 21, 2006, at 2:48 PM, Alvaro Abril - Tecnologia wrote: > I use applications .exe and .txt files. But .txt files is not secure, > because the people see and change information easily. I need files > with more > security conditions. What I need to use? To prevent changes, use a MAC. This is a "Message Authentication Code". You can find this in wikipedia. You can made a simple MAC function with the MD5() function. The MD5 () function does not require the Revolution encryption capability, it comes with any release. You need to have a secret string that is hidden in your script or hidden in the user key (serial number). Your MAC function can take the string to be tested and the secret code and return the base64Encode() of the MD5() of the concatenation of the two strings. From that make a function got generate file data from inside data by adding a line with the MAC. Also make a function that checks the MAC at the end of a file. Use those to check that the data has not been modified. If you also want to hide the data, you need to also (on the outside of all that) encrypt it. That is easiest with the Revolution encryption library, but you can use command line tools or make a simple hiding function using the MD5() function. If you do not think people will spend more than a few seconds on trying to read it, you can even make a simple function like the classic rot13 function. Dar _______________________________________________ use-revolution mailing list [email protected] Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution _______________________________________________ use-revolution mailing list [email protected] Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-revolution
