Question

Q. In substitution cipher , the following happens 

1. Rows are replaced by columns

2. None of the above

3. Columns are replaced by rows

4. Characters are replaced by other characters​

Answer 1

$\textsf{In substitution cipher, \textbf{characters are replaced by other characters}.}$

Answer 2

Option (4) is correct.

In a substitution cypher, Characters are replaced by other characters​.

About substitution cipher purpose :

• Substitution cyphers encrypt plaintext by changing each letter or symbol to a different symbol determined by the key.

• The Caesar cypher is possibly the simplest basic substitution cypher, named for the man who devised it. Other characters take the role of some of the main players in this scene.

• Based on a key, a replacement cypher substitutes each plain text character from a given fixed set with another character from the same set. A would-be replaced by B, B by C, and so on, with a one-step change.