Modification of Symmetric Cryptography with Combining Affine Chiper and Caesar Chiper which Dynamic Nature in Matrix of Chiper Transposition by Applying Flow Pattern in the Planting Rice

摘要

Classical cryptography is a way of disguising the news done by the peoplewhen there was no computer. The goal is to protect information by way ofencoding. This paper describesa modification of classical algorithms to makecryptanalis difficult to steal undisclosed messages. There are three types ofclassical algorithms that are combined affine chiper, Caesar chiper and chipertransposition. Where for chiperteks affine chiper and Caesar chiper can belooped as much as the initial key, because the result can be varied as much askey value, then affine chiper and Caesar chiper in this case is dynamic. Thenthe results of the affine and Caesar will be combined in the transpositionchiper matrix by applying the pattern of rice cultivation path and forchipertext retrieval by finally applying the pattern of rice planting path. Andthe final digit of the digit shown in the form of binary digits so that 5characters can be changed to 80 digit bits are scrambled. Thus the cryptanalystwill be more difficult and takes a very long time to hack information that hasbeen kept secret.