Substitution Cipher
A classical encryption method that generates ciphertext by replacing plaintext letters with other letters or symbols according to a fixed mapping. Its security depends on keeping the mapping secret, and it is vulnerable to frequency analysis attacks.
Timeline (last 90 days)
What the protagonist Legrand deciphers in 'The Gold-Bug' is a substitution cipher.
Al-Kindi's core insight was that a substitution cipher only changes the appearance of letters, not their statistical distribution.
The security of a substitution cipher depends entirely on the attacker not knowing the mapping; once there is a sufficiently long ciphertext, the statistical features of the language leak traces of the plaintext.
The security of a substitution cipher is built on keeping the mapping table secret; once the mapping table leaks, the ciphertext becomes immediately readable.
For classic cipher types such as substitution ciphers and transposition ciphers, AI assistance can significantly accelerate the decipherment process.
All Facts (5)
What the protagonist Legrand deciphers in 'The Gold-Bug' is a substitution cipher.
50%UnverifiedAl-Kindi's core insight was that a substitution cipher only changes the appearance of letters, not their statistical distribution.
50%UnverifiedThe security of a substitution cipher depends entirely on the attacker not knowing the mapping; once there is a sufficiently long ciphertext, the statistical features of the language leak traces of the plaintext.
50%UnverifiedThe security of a substitution cipher is built on keeping the mapping table secret; once the mapping table leaks, the ciphertext becomes immediately readable.
50%UnverifiedFor classic cipher types such as substitution ciphers and transposition ciphers, AI assistance can significantly accelerate the decipherment process.
50%