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A comment on Crypto 101 – Introductory course on cryptography. Parent comment

Re:Crypto 101 – Introductory course on cryptography by sorokod on Friday December 02, 2016 @01:59PM (#13091278)
The act of reversing a technique is called "kaeshiwaza". Kaeshiwaza is possible only if there there is an opening (weakness) in the waza.

That is all there is to it.

Some examples here https://www.youtube.com/watch?v=C_SB0TqvUb8

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