TAILIEUCHUNG - Bài giảng Mật mã học: Tổng quan về mật mã học - Huỳnh Trọng Thưa

Bài giảng "Mật mã học: Tổng quan về mật mã học" cung cấp cho người học các kiến thức: Introduction, information security and cryptography, cryptographic goals, one-way functions, basic terminology and concepts, . Mời các bạn cùng tham khảo. | Bài giảng Mật mã học Tổng quan về mật mã học - Huỳnh Trọng Thưa Tổng quan về mật mã học Huỳnh Trọng Thưa htthua@ Introduction Cryptography was used as a tool to protect national secrets and strategies. 1960s computers and communications systems - gt means to protect information and to provide security services. 2 Introduction cont. 1970s DES Feistel IBM - the most well-known cryptographic mechanism in history 1976 public-key cryptography Diffie and Hellman 1978 RSA Rivest et al. - first practical public-key encryption and signature scheme 1991 the first international standard for digital signatures ISO IEC 9796 was adopted. 3 Information security and cryptography Some information security objectives Privacy or confidentiality Data integrity Entity authentication or identification Message authentication Signature Authorization Validation Access control 4 Information security and cryptography cont. Some information security objectives Certification Timestamping Witnessing Receipt Confirmation Ownership Anonymity non-repudiation Revocation 5 Information security and cryptography cont. Cryptography is the study of mathematical techniques related to aspects of information security such as confidentiality data integrity entity authentication and data origin authentication. Cryptography is not the only means of providing information security but rather one set of techniques. 6 Cryptographic goals Confidentiality Data integrity Authentication Non-repudiation Cryptography is about the prevention and detection of cheating and other malicious activities. 7 A taxonomy of cryptographic primitives 8 Background on functions Function f X Y f x y Ex f 1 1 f 2 4 f 3 9 X 1 2 3 . 10 f 4 5 f 5 3 f 6 3 f 7 5 f 8 9 f 9 4 f x rx where rx is the remainder f 10 1. when x2 is divided by 11. image of f is the set Y 1 3 4 5 9 9 1-1 functions A function is 1 1 injection - đơn ánh if each element in Y is the image of at most one element in X A function is onto toàn ánh if each element in

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