Abstract
The transposition process is needed in cryptography to create a diffusion effect on DES and AES algorithms as standard information security algorithms by the National Institute of Standards and Technology. The problem with DES and AES algorithms is that their transposition index values form patterns and do not form random values. This condition will certainly make it easier for a cryptanalyst to look for a relationship between ciphertexts because some processes are predictable. This research designs a transposition algorithm called Square Transposition. Each process uses square 8 × 8 as a place to insert and retrieve 64-bits. The determination of the pairing of the input scheme and teh retrieval scheme that have unequal flow is an important factor in producing a good transposition. The Square Transposition can generate random and non-pattern indices, so that transposition can be done better than DES and AES.
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