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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)