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The text explains cryptography, focusing on ciphers and keys. A cryptogram is created by shifting letters in a message to the next one in the alphabet. To encrypt a message, two main components are necessary: the cipher, which is a set of rules for encoding information (like shifting letters), and the key, which arranges those rules. In this example, the key is one, as each letter is shifted by one position. To decrypt a message, one must know the cipher used and the key or attempt to crack the code by testing combinations or analyzing the code, a process known as deciphering. The text also questions whether a unique combination of cipher and key can be developed.
