>I use STRCONV([test123],13) to encode, STRCONV([test123],14) to decode.
>See the VFP help

Jose:

Note that this is just a conversion between plain text and Base64. It is not data encryption by any means.

Tim's question was about the use of a checksum with SYS(2007). A checksum is a simple (not super accurate) way to compare two strings to see they are the same. It could be used to compare passwords or the contents of a file to detect tampering. It is feasible to create a string that will match a checksum though. A better way is to use strong encryption in the form of a hash (MD5 for example). Note that a hash, (and checksum) are one-way values (i.e. you cannot get the original text back).

HTH