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Reverse algorithm was previously evaluated as encryption method concluding that its simple adoption is unviable, since it does not assurance the pre-image existence. Variable-Length Encryption Method (VLE) was proposed where a alternative algorithm with extra bits is adopted when pre-image computation is not possible. If an adequate secret key is used with… (More)

A cellular automata (CA) model in cryptography is investigated. A previous work analyzed the usage of reverse algorithm for pre-image computation as an encryption method. The main conclusion was that the simple adoption of such method is not viable, since it does not have 100% of guarantee of pre-image existence. A new approach was proposed that uses extra… (More)

Cellular automata (CA) are particularly well suited for cryptographic application and there are several previous studies in this topic (Benkiniouar & Benmohamed, 2004; Gutowitz, 1995; Kari, 1992; Nandi et al., 1994; Oliveira et al., 2004; 2008; Seredynski et al., 2003; Tomassini & Perrenoud, 2000; Wuensche, 2008; Wolfram, 1986). Since CA rule is simple,… (More)

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