Name the cipher from the evidence
Identify ciphers from patterns in encrypted text. Learn to distinguish Caesar, Vigenère, Atbash, Polybius and other methods online.
Read the ciphertext before choosing
Inspect the structure
Word lengths, repeated groups, spacing and symbol sets reveal how a message was transformed. Form a hypothesis from those traces instead of recalling a label at random.
Compare cipher families
Rounds contrast substitution, polyalphabetic, coordinate and transposition methods. Feedback explains the feature that separates the correct answer from its distractors.
A first step in cryptanalysis
Identifying the likely cipher helps you choose an attack. This focused practice prepares you for deeper key-recovery challenges.