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Computer Science 4 Online
OpenStudy (mokeira):

I encrypted a number by adding 94 and then modulo 1000...i want to decrypt it..how do i do so...im using java.

OpenStudy (e.mccormick):

Ummm... you are doing an operation where lots of answers are 0. Not one, but lots. There is no way to reverse that.

OpenStudy (mokeira):

i already got a way to encrypt it but thanks

OpenStudy (e.mccormick):

Kk. Matrices are a popular one for basic stuff, but there are libraries too.

OpenStudy (mokeira):

what dyu mean matrices?

OpenStudy (e.mccormick):

This is an example of the Hill Cypher: http://www.sosmath.com/matrix/coding/coding.html This is a paper on AES: http://www.unc.edu/~marzuola/Math547_S13/Math547_S13_Projects/I_Sears_Section003_AdvancedEncryptionStandard.pdf Both use matrices to do the work.

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