Question

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

Answer 1

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

Answer 2

i already got a way to encrypt it but thanks

Answer 3

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

Answer 4

what dyu mean matrices?

Answer 5

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.