On Cipher Design Based on Switchable Controlled Operations - Computer Network Security - page 327

than the linear attack. This result is in confirmation with the analysis of other DDO-
based ciphers described in [3]. The main results of this paper can be formulated as
follows:
1. The SCOs are introduced as a new cryptographic primitive suitable to designing
fast ciphers while implemented in cheap hardware.
2. The use of SCOs is a method to prevent weak keys and homogeneity in the ciphers
with SKS. Several SCO-based ciphers with SKS have been proposed.
3. Use of SCOs allows one to design secure ciphers that are free of reversing the
key scheduling while changing encryption mode for decryption one.
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