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Space/time trade-offs for higher radix modular multiplication using repeated addition

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1 Author(s)
C. D. Walter ; Comput. Dept., Univ. of Manchester Inst. of Sci. & Technol., UK

The value of using a higher radix for modular multiplication in the context of RSA is investigated. The main conclusion is that for algorithms which perform the multiplication via repeated addition, there is, broadly speaking, a direct trade-off between space and time provided by change of radix. Thus chip area utilized is roughly proportional to speed. However, initially, as the radix is increased from 2, there is a short-lived increase in speed greater than the extra area used

Published in:

IEEE Transactions on Computers  (Volume:46 ,  Issue: 2 )