"JUNo" by _J_

[difficulty: 3] [protection: modified MD5, unknown math, 3way block cipher]

JUNo contains floating point math utilizing the normal instructions and a math library called MAPM (Mike's Arbitrary Precision Math). However, the path between the serial number and the comparison requiring satisfaction is separated only by the 3way code. Ultimately the serial needs to be the ciphertext that, when decrypted with a key generated by the crackme, yields a block of plaintext derived from the name and company fields.

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