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A comment on The Cryptographic Doom Principle. Parent comment

Re:The Cryptographic Doom Principle by madez on Tuesday April 14, 2015 @12:40PM (#9375489)
Read this thread again. Your statement is not correct since CC never gets to see the plaintext. CC is just a bijective function on (blocksize of KC) bits.
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Re:The Cryptographic Doom Principle by sirclueless on Tuesday April 14, 2015 @12:49PM (#9375568)
Did you edit your post? I'm not the only one who misread it. If KC is applied first to the plaintext, then assuming you didn't flub anything in implementation the combined scheme won't be less secure than KC, I agree. Applying CC effectively becomes security through obscurity, which is admittedly sometimes helpful.
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Re:The Cryptographic Doom Principle by madez on Tuesday April 14, 2015 @01:17PM (#9375757)
No, sirclueless, I didn't change the scheme I wrote about.

Yes, it adds security through obscurity without losing security through well-known recommended ciphers.

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