Question

A permutation block (P-box) in a modern block cipher is an example of a keyless transposition cipher. What does this statement mean? (See Figure 31.8 in the text.) Different between Threat and Attack

Answer 1

Answer:

$\huge\fbox\pink{A}\fbox\blue{n}\fbox\purple{S}\fbox\green{w}\fbox\red{E}\fbox\orange{r}$⇢⇢$\huge{\red{\mathfrak{\underline{\underline{AnSwEr}}}}}$⚓⚓$\huge\fbox\pink{A}\fbox\blue{n}\fbox\purple{S}\fbox\green{w}\fbox\red{E}\fbox\orange{r}$⇢▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭$\huge{\red{\mathfrak{\underline{\underline{AnSwEr}}}}}$$\huge{\red{\mathfrak{\underline{\underline{AnSwEr}}}}}$⚓$\huge\fbox\pink{A}\fbox\blue{n}\fbox\purple{S}\fbox\green{w}\fbox\red{E}\fbox\orange{r}$⇢☞ ☞ ⇢☯☞ ☯⇢▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭☯☯☞ ☞ ⇢⇢▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭☯☯⇢▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭$\huge{\red{\mathfrak{\underline{\underline{AnSwEr}}}}}$$\huge{\red{\mathfrak{\underline{\underline{AnSwEr}}}}}$$\huge\fbox\pink{A}\fbox\blue{n}\fbox\purple{S}\fbox\green{w}\fbox\red{E}\fbox\orange{r}$⚓$\huge{\red{\mathfrak{\underline{\underline{AnSwEr}}}}}$▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭▬▭☯☯