Reduce encryption data size

[samiBendou]

Current behavior

• The encryption key remains the same for all the iterations of encryption
• The key is displayed at each iteration
• The key is saved for each iterations

Expected behavior

• The key is displayed once at the start of the sca command
• Only one key is saved for the data-set

Alternative behavior

• The key is displayed once at the start of the sca command
• The key is saved for each iterations

[samiBendou]

Regarding the following facts :

• Hardware AES : The key represents 35 / 700 = 5% of the binary data sent via UART
• Software AES : The key represents 35 / 8300 < 1% of the binary data sent via UART

Minifying encryption data will not significantly reduce the parsing time.

In the case of Binary to CSV conversion, despite the keys represents a third of the CSV encryption data. It still represent the same proportion of the hole CSV as above. This makes the minification useless for performance purposes.

Furthermore, minification does not allow to inject different keys in the dataset which can be useful if we want to simulate counter-measures that changes the key during the acquisition.