Concepts in Data Encryption:
Diagraphic substitution is a slightly more complex way of enciphering plain text
letters with two letters found within a matrix. However, the matrix used is actually four
matrices. There are two matrices used to identify two plain text letters at a time. The
other two matrices are used to identify the corresponding cipher text values. Each
individual matrix has all the letters of the alphabet:
Brain teaser: What must all matrices have in common? Does the order of letters in a matrix make a difference?
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