What are "reduced variants" of stream ciphers and how do they relate to lightweight cryptography?

How do their internal states compare to those of non-reduced variants? Security aspects?


I am aware of reduced variants of Salsa20 (Salsa20/12 and Salsa20/8). These are variants of Salsa20 using reduced number of hashing rounds (12 and 8 instead of standard 20).

This is the same idea as reducing number of rounds of a block cipher - you get better performance by undermining security.

  • $\begingroup$ Is Bivium a reduced variant of Trivium? $\endgroup$ – Roman Volkov Sep 20 '16 at 7:22
  • $\begingroup$ @RomanVolkov This paper says that Bivium-A and Bivium-B are reduced versions of Trivium. $\endgroup$ – Ella Rose Sep 20 '16 at 16:05

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