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The Copiale cipher is a substitution cipher. It is not a 1-for-1 substitution but rather a homophonic cipher: each ciphertext character stands for a particular plaintext character, but several ciphertext characters may encode the same plaintext character. For example, all the unaccented Roman characters encode a space.
Great Cipher: Solved 1730 Olivier Levasseur's treasure cryptogram Unsolved 1760–1780 Copiale cipher: Solved in 2011 1843 "The Gold-Bug" cryptogram by Edgar Allan Poe: Solved (solution given within the short story) 1882 Debosnys cipher: Unsolved 1885 Beale ciphers: Partially solved (1 out of the 3 ciphertexts solved between 1845 and 1885) 1897
[35] [36] In 2012, ISI's Kevin Knight spearheaded a successful drive to crack the Copiale cipher, a lengthy encrypted manuscript that had remained unreadable for 250 years. [37] Also in 2012, the USC-Lockheed Martin Quantum Computing Center (QCC) became the first organization to operate a quantum annealing system outside of its manufacturer, D ...
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A chosen-ciphertext attack (CCA) is an attack model for cryptanalysis where the cryptanalyst can gather information by obtaining the decryptions of chosen ciphertexts. From these pieces of information the adversary can attempt to recover the secret key used for decryption.
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