Message confidentiality

Các kiểu thao tác đầu tiên được đề nghị (ECB, CBC, OFB, CFB) đảm bảo tính bí mật (confidentiality), không giúp đảm bảo tính toàn vẹn thông tin (message integrity). Các kiểu thao tác được thiết kế cho phép (CCM, EAX và OCB) vừa đảm bảo tính bí mật, vừa đảm bảo xác định tính toàn vẹn thông tin.

96p i4share 04-02-2013 77 12   Download

Up to this point we have seen: Classical Crypto Symmetric Crypto Asymmetric Crypto These systems have focused on issues of confidentiality: Ensuring that an adversary cannot infer the original plaintext message, or cannot learn any information about the original plaintext from the ciphertext. In today’s lecture we will put a more formal framework around the notion of what information is, and use this to provide a definition of security from an information-theoretic point of view.

24p muathu_102 28-01-2013 71 6   Download

We have looked at confidentiality services, and also examined the information theoretic framework for security.

33p muathu_102 28-01-2013 72 4   Download

Classified along three independent dimensions: The type of operations used for transforming plaintext to ciphertext The number of keys used symmetric (single key) asymmetric (two-keys, or public-key encryption) The way in which the plaintext is processed

26p muathu_102 28-01-2013 63 5   Download