When I wrote this man page more than 5 years ago, I simply didn't
understand the true symmetric nature of Enigma, so my description of ``automatically detects that the input is encrypted'' was simply wrong. Replace that by a more accurate description of why feeding the ciphertext again into the engine will decrypt it. MFC after: 1 week
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@ -33,8 +33,10 @@ simple encryption program, working on a
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.Dq secret-key
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basis. It operates as a filter, i. e. it encrypts or decrypts a
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stream of data from standard input, and writes the result to standard
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output. It automatically detects whether the input data stream is
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already encrypted, and switches into decryption mode in this case.
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output.
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Since its operation is fully symmetrical, feeding the encrypted data
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stream again through the engine (using the same secret key) will
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decrypt it.
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.Pp
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There are several ways to provide the secret key to the program. By
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default, the program prompts the user on the controlling terminal for
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