Chacha Encryption Technique

Thread Starter

zulfi100

Joined Jun 7, 2012
656
Hi,
I am studying the slides from the following lecture stuff:
https://kf5011.github.io/lectures/kf5011-L10.1.pdf

But I have one more slide which I have attached which says:
The core function maps a 256 bit key, 64-bit nonce and 64 bit and a 64 bit counter to a fixed block size of key stream.

I can't understand what is meant by the term "mapping" here , where is the plain-text. I am able to understand it is a stream cipher.

Some body please guide me.

Zulfi.
 

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Thread Starter

zulfi100

Joined Jun 7, 2012
656
Hi,
I have dound one more picture of a circuit. Some body please guide me about this circuit also. I know about ARX: addition, rotation and XOR. But what this picture tells us.

Zulfi.
Zulfi.circuit.jpg
 
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