Disk No: 2004                                                           
Disk Title: PC-IRIS, PC-MERLIN, PC-LOCK                                 
PC-SIG Version: S1.5                                                    
                                                                        
Program Title: PC-Iris                                                  
Author Version: 4.1                                                     
Author Registration: $39.00 for PC-IRIS, PC-MERLIN, and PC-LOCK.        
Special Requirements: None.                                             
                                                                        
A file containing sensitive information may be encrypted by IRIS,       
effectively precluding unauthorized disclosure.  The (encrypted) file   
may be copied to floppy disk and sent via public mail (an insecure      
channel) to another party, who, having access to IRIS and the "KEY"     
used to encrypt the document, will be able to decrypt the file,         
producing the original spreadsheet.                                     
                                                                        
IRIS implements these commercial cryptographic techniques:              
                                                                        
~ ADFGVX                                                                
                                                                        
~ RSA public key cryptography                                           
                                                                        
~ DES                                                                   
                                                                        
~ LITTLEWOOD                                                            
                                                                        
~ VERNAM (XOR)                                                          
                                                                        
~ PLAYFAIR                                                              
                                                                        
~ BAZERIES                                                              
                                                                        
~ VIGENERE                                                              
                                                                        
~ CRC (checksum) generation                                             
                                                                        
~ Secure file erasure.                                                  
Program Title: PC-Lock                                                  
Author Version: 1.3                                                     
Author Registration: $39.00 for PC-IRIS, PC-MERLIN, and PC-LOCK.        
Special Requirements: None.                                             
                                                                        
PC-LOCK allows the user of a PC to "lock" a DOS session, thereby        
inhibiting unauthorized usage of the machine during short absences such 
as lunchbreak.  The PC-LOCK program prompts the user for a password (and
re-prompts for verification), and then prevents any further use of the  
machine until the correct password is re-entered.                       

Program Title: PC-Merlin                                                
Author Version: 2.2                                                     
Author Registration: $39.00 for PC-IRIS, PC-MERLIN, and PC-LOCK.        
Special Requirements: None.                                             
                                                                        
PC-MERLIN integrates the DOS "copy" program with data encryption.  This 
allows the user to copy multiple files to a target disk or directory,   
encrypting the data as the copy proceeds.  Such a function is           
particularly useful to users who only need to encrypt data that goes    
offsite to remote users, or backups.                                    
                                                                        
PC-SIG                                                                  
1030D East Duane Avenue                                                 
Sunnyvale  Ca. 94086                                                    
(408) 730-9291                                                          
(c) Copyright 1989 PC-SIG, Inc.