A1Z26 vs Bacon's cipher — rank versus hidden binary

A1Z26 and Bacon’s cipher both encode letters with no real key, but they belong to different worlds: one is a plain number, the other a binary writing built to hide.

Decimal versus 5-bit binary

A1Z26 gives each letter its rank: A=1, B=2, …, Z=26. It is decimal and instantly readable.

Bacon gives each letter a group of five binary symbols (historically a and b): A = aaaaa, B = aaaab, C = aaaba… Five bits encode 32 combinations, more than enough for the alphabet.

The real difference: Bacon conceals itself

Bacon’s genius isn’t the code itself but what you do with it. The two “symbols” need not be the letters a/b: they can be two fonts, two styles (roman/italic), upper/lowercase, two word lengths… That way you hide a binary message inside an innocuous text. This is steganography: an unsuspecting reader doesn’t even see that a message is there.

A1Z26, by contrast, openly shows a string of numbers — impossible to hide and obvious to spot.

When to use which

• Quick numeric puzzle, younger audiences → A1Z26. The rule fits in one sentence.
• Message hidden in another text, fake document, “invisible” clue → Bacon. Two typographic styles, and the secret vanishes to the naked eye.
• Real security → neither. These are encodings (and a concealment technique), not strong ciphers.