Hi Thillai,
                  
                  
                  Upon closer examination of the logs you sent, it
                    appears that the code execution flow in both cases
                    is not the same, and the errors encountered are of a
                    different nature.
                  
                  
                  My previous message was based on Use Case 10,
                    which seems to correspond to a transaction involving
                    two readings of the SFI=14h file. However, the log
                    for this case does not display DEBUG level traces,
                    which would be very helpful for a more in-depth
                    analysis.
                  
                  
                  On the other hand, the log for Use Case 4 does
                    show DEBUG traces, but here the transaction
                    concludes with an "Unauthorized key error." This
                    specific error suggests that the card you are using
                    requires a particular configuration to specify the
                    key KIF value that is not provided by this
                    particular card.
                  
                  
                  Based on the JSON file generated by the card
                    analysis tool, the KIF value to be used for this
                    AID  is 0xFF. In the context of the Use Case 4 code,
                    this would translate to an adjustment within the
                    `initSecuritySetting()` method, similar to the
                    following:
                  
                  
                  private static void
                      initSecuritySetting() {
                  
                     LegacySam sam =
                        selectSam(samReader);
                    
                        symmetricCryptoSecuritySetting =
                  
                  
                    
                       calypsoCardApiFactory
                    
                  
                  
                    
                      
                        
                            .createSymmetricCryptoSecuritySetting(
                      
                    
                  
                  
                    
                      
                        
                          
                              LegacySamExtensionService.getInstance()
                        
                      
                    
                  
                  
                    
                      
                        
                          
                            
                                .getLegacySamApiFactory()
                          
                        
                      
                    
                    
                      
                        
                          
                            
                                .createSymmetricCryptoCardTransactionManagerFactory(samReader,
                                sam))
                          
                        
                      
                    
                  
                  
                    
                      
                        
                            .assignDefaultKif(PERSONALIZATION, (byte)
                            0xFF)
                      
                    
                    
                      
                        
                            .assignDefaultKif(LOAD, (byte) 0xFF)
                      
                    
                    
                      
                        
                            .assignDefaultKif(DEBIT, (byte) 0xFF);
                      
                    
                  
                   }
                  
                  
                  Could you please try implementing this change in
                    your Use Case 4 code and observe if it resolves the
                    "Unauthorized key error"? 
                  Regarding use case 10, I would need more logs to
                    help you. But the previous configuration with 0xFF
                    should also apply here!
                  
                  
                  Best regards,
                  
                  
                  Jean-Pierre Fortune
                  Keyple-Dev Team