Some time ago, I wrote an ASP-based encryption program that was limited to the Ascii character set because of the difficulty I experienced in translating the higher Unicode characters. I just created a new one that supports all Unicode symbols based on an Excel spreadsheet (version 2010 or later required).

Usage:

Sender/Receiver both need the spreadsheet.

1. Sender types message into cell A2 on the Encrypt tab.
2. Sender copies lists of numbers generated from the Code Lists tab and sends them SEPARATELY to the receiver. NOTE: Without BOTH sets of numbers, decryption is impossible.
3. Receiver pastes the two lists into the cells starting at A2 on the Decrypt tab.

Decrypted message will be displayed in cell E2 in the Decrypt tab.