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The notion of a Secretly Embedded Trapdoor with Universal Protection (SETUP) has been recently introduced. In this paper we extend the study of stealing information securely and subliminally from black-box cryptosystems. The SETUP mechanisms presented here, in contrast with previous ones, leak secret key information without using an explicit subliminal channel. This extends this area of threats, which...
The notion of a Secretly Embedded Trapdoor with Universal Protection (SETUP) and its variations on attacking black-box cryptosystems has been recently introduced. The basic definitions, issues, and examples of various setup attacks (called Kleptographic attacks) have also been presented. The goal of this work is to describe a methodological way of attacking cryptosystems which exploits certain relations...
There has been much recent research in designing symmetric ciphers with backdoors that have either public designs or black-box designs. Current Digital Rights Management needs have resurrected the use of hidden ciphers (which were traditionally suggested by the government as black-box designs) in the form of obfuscated “white-box” algorithms. A recent backdoor proposal is the Monkey cipher which is...
In the last few years we have concentrated our research efforts on new threats to the computing infrastructure that are the result of combining malicious software (malware) technology with modern cryptography. At some point during our investigation we ended up asking ourselves the following question: what if the malware (i.e., Trojan horse) resides within a cryptographic system itself? This led us...
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