Question

Computer Science Encryption Please make it simple thank you.

To make a secure block cipher, why is diffusion not enough? That is, why is confusion also necessary?

Answer 1

Answer)

To make a secure block cipher, diffusion is not enough and confusion is also necessary. The confusion serves to cover any relationship between the plaintext, cipher text and therefore the key and the diffusion is the influence of individual plain-text or key bits over the maximum amount of the cipher text. Thus confusion should also be used along with the diffusion as associate degree algorithmic rule with the one key-dependent operation table of 64 bits of plain-text to 64 bits of cipher is secure and requires just 1020 bytes of memory.