| Summary: | 碩士 === 長庚大學 === 資訊管理研究所 === 93 === This research is related to method for protecting digital secret, which is an invention by the advisor of this master thesis. The method is a novel approach to digital signature with personalized signature subkey. The invention is to devise multisignature techniques so that their applications can be adopted at the personal level. According to the method, we can divide the signature private key into two sub-keys. The first one is an input-derived sub-key, which is generated according to a personalized secret input chosen by the signatory. The second one is a key-dependent sub-key, which is generated from the private key and the input-derived sub-key. Applying these two subkeys respectively to obtain two partial signatures and subsequently computing the signature from the two partial signatures carry out digital signature.
This research has implemented the described process and has proven that it is a feasible solution in the real-word practices. Particularly, the author of this thesis calculates the execution times. Under the assumption of attacking by exhaustive search, the author compares the time needed to break the proposed cryptosystem with that needed to break a conventional RSA cryptosystem. The author concludes that the signature method with personalized subkey is superior to the conventional RSA signature.
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