kind of cipher in which a becomes b, b becomes c, e.g.

The kind of cipher where “A becomes B, B becomes C, etc.” is a Caesar cipher (also called a shift cipher).

What that phrase describes

In this kind of cipher, each letter in the alphabet is shifted forward by a fixed number of positions.

So if the shift is 1, the mapping looks like:

• A → B
• B → C
• C → D
• …
• Y → Z
• Z → A

This simple shifting of the entire alphabet is the hallmark of a Caesar cipher.

Why “Caesar” fits the clue

• The clue mentions a regular pattern “A becomes B, B becomes C,” which is exactly a constant shift substitution.

• Historical and modern descriptions of the Caesar cipher often use that exact kind of example to explain it.

So for a crossword-style clue “kind of cipher in which A becomes B, B becomes C, e.g.” the intended answer is CAESAR.

Information gathered from public forums or data available on the internet and portrayed here.