Cipher comparisons "X vs Y"

Caesar vs Vigenère — which cipher fits which job?

Julius Caesar's cipher (-50) and Vigenère's (1586) belong to two distinct families — monoalphabetic and polyalphabetic — separated by 16 centuries of evolution. A no-nonsense comparison.

Beaufort vs Vigenère — two keyword ciphers, one subtraction apart

Beaufort (1857) and Vigenère (1586) share the same table and the same keyword, but Beaufort subtracts where Vigenère adds. That single twist makes Beaufort its own inverse. A straight comparison.

ROT13 vs Atbash — two "self-inverse" ciphers compared

ROT13 (shift of 13) and Atbash (alphabet mirror) share a rare property: applying them twice returns the plaintext. Twenty-six centuries separate them — one masks a spoiler, the other was the tool of Hebrew scribes.

A1Z26 vs Morse — two keyless ways to encode letters

A1Z26 replaces each letter with its rank (A=1 … Z=26); Morse replaces it with a string of dots and dashes. Two public, secret-free encodings — but one is a number, the other a signal. A comparison.

Caesar vs ROT13 — what's the difference, really?

ROT13 *is* a Caesar cipher — with a shift hard-coded at 13. So the real question isn't "which is stronger?" but "why give a special case its own name?". Answer: for a singular property that changes everything.

A1Z26 vs Bacon's cipher — rank versus hidden binary

A1Z26 encodes each letter as a number (A=1 … Z=26); Bacon's cipher (1605) encodes each letter as five binary symbols that can be hidden inside typography. Two opposite logics. A comparison.

Pigpen vs Templar — two "symbol" ciphers compared

Pigpen (18th century, freemasons) and the Templar cipher (12th–14th centuries, Order of the Temple) each replace letters of the alphabet with geometric glyphs. Same family, two radically different aesthetics.

One-time pad vs Vigenère — why one is breakable and the other is not

The one-time pad (Vernam, 1917) and Vigenère (1586) rely on exactly the same mechanics — shift each plaintext letter by a key letter. Yet one is mathematically unbreakable, the other falls in a few hours. A single difference separates them.

Playfair vs Vigenère — digraphs versus shifts

Playfair (1854) encrypts letters in pairs on a 5×5 grid; Vigenère (1586) shifts each letter by a keyword. Two keyword classics, two opposite logics. A comparison.

Polybius square vs Tap code — the same grid, two channels

The Polybius square turns each letter into (row, column) coordinates on a 5×5 grid; the tap code taps those same coordinates on a wall. Same grid, different channel. A comparison.