Vowel-Consonant Code

Vowels and consonants follow different shift rules.

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Vowels and consonants follow different shift rules.

This cipher applies different transformation rules to vowels (A, E, I, O, U) versus consonants. Typically, vowels shift by one amount while consonants shift by another. This creates two parallel encoding systems within the same cipher.

Vowels (A,E,I,O,U) shift by X positions. Consonants shift by Y positions.

With vowels +1, consonants +2: CAT -> E(C+2) B(A+1) V(T+2) = EBV
WATER -> Y(W+2) B(A+1) V(T+2) F(E+1) T(R+2) = YBVFT

How to recognize it

Two different shift patterns
Identify vowels vs consonants first
Vowels: A, E, I, O, U; all others are consonants

Common mistakes

Applying wrong shift to vowels/consonants
Forgetting Y is a consonant (not a vowel)
Not identifying which shift applies to which group

Step-by-step walkthrough

Encode 'CAT' with vowels +1, consonants +2

C is a consonant. Shift by +2: C (3rd) + 2 = E
A is a vowel. Shift by +1: A (1st) + 1 = B
T is a consonant. Shift by +2: T (20th) + 2 = V

Answer: EBV

Practice guidance

Coding & Decoding