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With a fixed key size – key has 128 bits, while block size is 8 byte – how do I calculate how many different keys and texts I have to test for an cryptanalytic statistics study?

Differently worded: I am planning to encrypt multiple samples and see how many bites have changed, compared to the input block. Finally I plan to create a Histogram and get conclusions. If the cypher algorithm is good, half of the bits should have changed (50%).

The problem is that I do not know how many samples I have encrypt to gain a good statistical foundation. How many blocks do I have to (or should I) encrypt, and what formula should I be using?

With a fixed key size – key has 128 bits, while block size is 8 byte – how do I calculate how many different keys and texts I have to test for an cryptanalytic statistics study?

Differently worded: I am planning to encrypt multiple samples and see how many bits have changed, compared to the input block. Finally I plan to create a Histogram and get conclusions. If the cypher algorithm is good, half of the bits should have changed (50%).

The problem is that I do not know how many samples I have encrypt to gain a good statistical foundation. How many blocks do I have to (or should I) encrypt, and what formula should I be using?

With a fixed key size: how do I calculate how many different keys and texts I have to test for an statistics study?

I will encrypt that samples and see how many bites has changed from the inputed block. The problem is that I dont know how many samples I have encrypt to have a good statistical foundation.

Finally I will make a Histogram and get conclusions. If the cypher algorithm is good, half of the bits should have changed (50%).

My key has 128 bits. My block size is 8 bytes

With a fixed key size – key has 128 bits, while block size is 8 byte – how do I calculate how many different keys and texts I have to test for an cryptanalytic statistics study?

Differently worded: I am planning to encrypt multiple samples and see how many bites have changed, compared to the input block. Finally I plan to create a Histogram and get conclusions. If the cypher algorithm is good, half of the bits should have changed (50%).

The problem is that I do not know how many samples I have encrypt to gain a good statistical foundation. How many blocks do I have to (or should I) encrypt, and what formula should I be using?

With a fixed key size: how do I calculate how many different keys and texts I have to test for an statistics study?

I will encrypt that samples and see how many bites has changed from the inputed block. The problem is that I dont know how many samples I have encrypt to have a good statistical foundation.

Finally I will make a Histogram and get conclusions. If the cypher algorithm is good, half of the bits should have changed (50%).

With a fixed key size: how do I calculate how many different keys and texts I have to test for an statistics study?

I will encrypt that samples and see how many bites has changed from the inputed block. The problem is that I dont know how many samples I have encrypt to have a good statistical foundation.

Finally I will make a Histogram and get conclusions. If the cypher algorithm is good, half of the bits should have changed (50%).

My key has 128 bits. My block size is 8 bytes