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The Computer Journal 1985 28(3):343-348; doi:10.1093/comjnl/28.3.343
© 1985 by British Computer Society
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Algorithms Supplement

RSA KEY CALCULATION IN ADA

D. G. N. Hunter *

Standard Telecommunication Laboratories Ltd, London Road, Harlow, UK

RSA encryption programs are inaccessible for several reasons – first they impose requirements on multiple precision arithmetic packages which are not met in general-purpose ones, especially the exponentiation operation in finite arithmetic; secondly, they are partially written in assembly code for speed, and rightly so; finally, they are being obscured by recently discovered short cuts. This paper describes one way of calculating RSA keys and includes some Ada procedures to illustrate the essential arithmetic; it is intended as a starting point for the construction of packages, especially those for 16-bit microcomputers.


* Standard Telecommunication Laboratories Ltd, London Road, Harlow, Essex


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