Cipher 10 Hc

Cipher is a Hypercard stack that will encode and decode secret messages using simple substitution or Vigenere crytosystems. It uses English language statistics to assist in cracking messages when the key or alphabet used to encode it is unknown. Examples are provided and a explanatory help file is included in the stack. Cipher is handy for people who want to exchange secret messages or for people who want to learn more about cryptosystems. ------------------------------- J. Clarke Stevens Georgia Tech Research Institute (404) 528-3254 clarke.stevens@gtri.gatech.edu