Unverified50% confidenceFactExact time
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.
1
Sources
50%
Confidence
Long-term
Relevance
10/14/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedThe security of a substitution cipher is built on keeping the mapping table secret; once the mapping table leaks, the ciphertext becomes immediately readable.75% similarVerifiedThe forward secrecy mechanism dynamically generates temporary session keys for each session, ensuring that even if a user's long-term private key is compromised, attackers cannot retroactively decrypt historical messages.75% similarUnverifiedFor claimed breakthroughs in decrypting long-unsolved ciphers, the cryptographic community typically requires public disclosure of methodology and verifiable results.74% similarUnverifiedWWI handcrafted ciphers have an extremely limited keyspace and ciphertext carries statistical regularities such as letter frequency distribution, making them weak encryption at the information-theoretic level.72% similar
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