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Elliptic Curve Based Password Authenticated Key Exchange Protocols
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Elliptic Curve Based Password Authenticated Key Exchange Protocols
Colin Boyd5 , Paul Montague6 and Khanh Nguyen6 
| (5) |
Information Security Research Centre, Queensland University of Technology, Brisbane, 4001, Australia |
| (6) |
Motorola Australia Software Centre, 2 Second Ave, Mawson Lakes, SA 5095, Australia |
Abstract
We investigate password authenticated key exchange (PAKE) protocols in low resource environments, such as smartcards or mobile
devices. In such environments, particularly in the future, it may be that the cryptosystems available for signatures and/or
encryptions will be based on elliptic curves, because of their well-known advantages with regard to processing and size constraints.
As a result, any PAKE protocols which the device requires should also preferably be implemented over elliptic curves. We show
that the direct elliptic curve (EC) analogs of some PAKE protocols are insecure against partition attacks. We go on to propose
a new EC based PAKE protocol. A modified version of the protocol for highly constrained devices, such as smartcards, is also
presented.
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