Why is symmetric lightweight cryptography only about block ciphers and not about stream ciphers? AFAIK stream cipher implementations cost at least three times less than block cipher ones?
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2$\begingroup$ When making these kind of statements, please include a reference to the place where the statements were made. We need context to explain (or in this case counter) any arguments. $\endgroup$– Maarten Bodewes ♦Jun 27, 2016 at 10:35
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Why is symmetric lightweight cryptography only about block ciphers and not about stream ciphers?
Why that assumption? There is a lot of work concerning stream ciphers for lightweight cryptography (LWC). You can find a relevant list here.
Plus, last week the ChaCha20-Poly1305 cipher suites (which are considered as lightweight) have been standardized in this RFC.
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$\begingroup$ yoob, please hit the V mark on the left of the answer to accept an answer if you think answers your question. $\endgroup$– Maarten Bodewes ♦Jun 27, 2016 at 15:05