Telecommunication project 2006

Telecommunication project 2006

The Cipher ModesThe Cipher Modes

Some definitions

- Initialization vector: it is a random data bloc which allows starting the encryption of the first bloc. Thus, it gives to the subject a kind of independent fortune.

- Confidentiality: it is the principle that information will not be disclosed to unauthorized subjects.

- Integrity: it is trust that can be placed in the information. Data integrity is having assurance that the information has not been altered between its transmission and its reception.

The Cipher ModesThe Cipher Modes

Output feedback

Cipher feedback

Electronic codebook

CBC-MAC

OCB

The Cipher ModesThe Cipher Modes

Cipher-block chaining

Counter mode

Electronic Codebook

The Cipher ModesThe Cipher Modes

Example with a picture

The Cipher ModesThe Cipher Modes

The picture Encrypted with ECB Encrypted with a more secure mode

Cipher-block chaining

The Cipher ModesThe Cipher Modes

Cipher feedback

The Cipher ModesThe Cipher Modes

Output feedback

The Cipher ModesThe Cipher Modes

Counter mode

The Cipher ModesThe Cipher Modes

CBC-MAC

The Cipher ModesThe Cipher Modes

OCB mode

The Cipher ModesThe Cipher Modes

Conclusion

Software: Smart Draw.

By interpreting information, we imagined the diagrams corresponding to the various modes of coding and drew them.

Preset forms: fleche, rectangle the scales for the definition of the sizes. code of colors for more simplicity.

We encountered some problems, like the bad precision of the mouse.

As a whole, this software is easy to use, indeed we had also the advantage of being able to re-use same forms of a diagram in another.

The Cipher ModesThe Cipher Modes