Person in charge : Yannick LEPLARD

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Portage of a software of decryption of filefrom
Mac to LinuxandStudy and development of its
graphicaluser interface

• Person in charge Yannick LEPLARD

September 2004 Florian PAYRI Olivier YOUF
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Contents

• Context
• Basics of cryptography
• Portage of the kernel
• Graphical interface

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Context
Context Basics of cryptography Portage of the
kernel The graphical interface
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Environment

• CreInnov an incubator in the USTL
• Dhimyotis a project

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Basics of cryptography
Context Basics of cryptography Portage of the
kernel The graphical interface
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Initiation with cryptology

• Confidentiality

• Integrity

• Authenticity

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Initiation with cryptology

• 2 types of coding
• Symmetrical coding
• Asymmetrical coding

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Symmetrical coding

• System of secrets keys
• DES (Data Encryption Standard) algorithm
• AES (Advanced Encryption Standard) algorithm

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Asymmetrical coding

• System of public keys private key public key
• RSA algorithm

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Portage of the kernel
Context Basics of cryptography Portage of the
kernel The graphical interface
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Existing project

• Software program of encryption and decryption of
  files
• Made for MacOs
• Using keys stored on physical authentifiers

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Existing project
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Definition of the portage of the kernel

• Adapt the code of the existing applicationto new
  platform (Linux)
• Identify the software environment needed in the
  new plaform for the execution of the software
  program

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Software environment

• Installation and configuration of our computers
• General libraries standard libraries, zLib,
• Cryptographic libraries CDSA

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Common Data Security Architecture

• Framework on cryptography
• Services and interfaces of programming
• Architecture

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Source code adaptation

• 3 modules dhibase, dhicdsa, dhicoder
• For each module, our mission was to -
  modify - compile - test - debug -
  identify and correct problems

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Source code adaptation

• Modification of the include
• Incompatibilities of code using external
  libraries
• Initialization of the variables
• Correction of code fragments

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Problems

• Difficulties of installation
• Regular modifications of the code
• Compatibility between files coded under Linux and
  MacOS

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The graphical interface
Context Basics of cryptography Portage of the
kernel The graphical interface
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The study

• Criteria - portability - graphical quality -
  usage facility
• 3 libraries WxWidgets, GTK2, Swing

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Advantages and drawbacks
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Advantages and drawbacks
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Advantages and drawbacks
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The grafical interface
- The virtual desktop -
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The graphical interface
- The selection window -
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The graphical interface
- The window of decryption -
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The assembly with the kernel

• JNI Java Native Interface

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Problems

• Professionalization of the architecture
• Slowness of the interface

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Conclusion

• Self documentation
• Cryptography discovery
• Results

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Questions

• ?