Question

Circuit for secure telecommunication based on
chaotic oscillator:
The project involves the simulation and implementation of a system for
communication based on two equal chaotic circuits.
Does anyone have any ideas with this theme? Help!

Answer 1

It consists of the following elements:

1) Chaotic oscillator: It is a modified Chua oscillator that generates three signals (x1, x2, x3), two of which are used for synchronization and encryption/decryption purposes.

2) Encryption block: It encrypts the message m(t) using a nonlinear function me(t) = (x2(t),m(t)).

3) Channels: Two channels transmit the chaotic signal and the encrypted message. Channel noise nd(t) is added. In the receiver side, the signals are filtered with a bank of filters, producing signals x1f (t) and mef (t).

4) Synchronization block: It retrieves the chaotic signals using only one signal from the chaotic oscillator (x1f (t)).

5) Decryption block: It decrypts the message by using a nonlinear function md(t) = (y2(t),mef (t)). In this case, y2 is the estimation of the chaotic signal x2 generated by the synchronization block.

6) Retrieving block: In this stage, an algorithm is executed for deciding which message value was sent at an instant t = tk, k = 1, 2, 3,...

Block diagram of the proposed communication system is given.

|ri (t) ·Xin (t) t) Synchroni- Mod. Chua Filter oscillator zation y2(t) T2 ma(t)Retrieving mef(t) m,(t Encryption Decryption Filter nd(t Transmitter Receiver