Dissertation
Dissertation > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > General issues > Security and confidentiality > Encryption and decryption

Research on Iris Based Cryptography

Author QiNing
Tutor ZhangDaPeng
School Harbin Institute of Technology
Course Computer Science and Technology
Keywords Cryptography Iris Key Biometric
CLC TP309.7
Type Master's thesis
Year 2008
Downloads 32
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Traditional cryptography uses key to encrypt and decrypt, so its security depends on key protection. This system has many potential problems, such as that the key can not provide non-repudiation as well as too long to be memorized, making it easy to be lost. In order to solve these problems, bio-cryptography is developed. It uses biometrics to generate keys, and uses the appropriate methods to protect information.Cryptography based on iris is an important branch of the bio-cryptography. Because iris is steady, unique, non-invasive, and so on, cryptography based on iris has an important significance and broad prospects. So we research on this subject and the main contents include the following:First, we summarize the theory of iris cryptography comprehensively and deeply. We discuss the relationship between iris cryptography and iris recognition, the issues it focuses on, the encryption and decryption process, the classification of iris encryption algorithm and how to measure performance.Then, we extract features from iris refer to the feature extraction process of iris recognition. Features extracted should not only describe the texture efficiently, but also has a strong distinction to be suitable for iris cryptography.Third, we propose a novel iris cryptography algorithm based on Reed-Solomon theory. This algorithm extracts feature vector from iris to encrypt and decrypt, while using Reed-Solomon to eliminate the fuzziness of iris.Fourth, we propose a novel iris cryptography algorithm based on Modified Fuzzy Vault. This algorithm extract feature vector from iris and use Modified Fuzzy Vault algorithm to encrypt and decrypt, which can eliminate the fuzziness of iris effectively.Last, we propose a novel algorithm called iris cryptography algorithm based on AES. This algorithm extract feature vector from iris and translate it into 128 bit binary string which is used as key in AES algorithm.

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