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Table 2 Energy cost of digital signature algorithms and HMAC, for Compaq iPAQ H3670 [26].

From: Energy-Efficient Source Authentication for Secure Group Communication with Low-Powered Smart Devices in Hybrid Wireless/Satellite Networks

Algorithm

Key size (bits)

Sign (mJ)

Verify (mJ)

RSA

1024

546.50

15.97

DSA

1024

313.60

338.02

ECDSA

163

134.20

192.23

HMAC

1.16 (J/B)