Information Theory

Authentication in Insecure Environments: Using Visual by Sebastian Pape

By Sebastian Pape

Sebastian Pape discusses assorted situations for authentication. at the one hand, clients can't belief their units and however are looking to be capable to do safe authentication. however, clients won't are looking to be tracked whereas their merchant doesn't wish them to percentage their credentials. Many clients will not be in a position to ensure no matter if their equipment is reliable, i.e. it might probably include malware. One resolution is to exploit visible cryptography for authentication. the writer generalizes this idea to human decipherable encryption schemes and establishes a courting to CAPTCHAS. He proposes a brand new safeguard version and provides the 1st visible encryption scheme which uses noise to complicate the adversary's activity. to avoid provider services from holding their clients lower than surveillance, nameless credentials can be utilized. despite the fact that, occasionally it really is fascinating to avoid the clients from sharing their credentials. the writer compares current ways in line with non-transferable nameless credentials and proposes an strategy which mixes biometrics and smartcards.

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Extra resources for Authentication in Insecure Environments: Using Visual Cryptography and Non-Transferable Credentials in Practise

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In public-key encryption schemes (see Def. 41) the problem of finding the secret key sk from the public key pk is based on the hardness (cf. Sect. 3) of a certain problem. It is obvious, that computing sk from pk should be hard on average and thus the underlying problem should be hard on average. Otherwise an adversary confronted with a problem that is only hard in the worst-case may succeed with reasonable probability. The emerging gap between average-case and worst-case analysis regarding the security of a cryptosystem may be further amplified if the algorithm’s runtime is given in Big O notation.

MvOV97]. 36 2 Mathematical and Cryptographic Foundation Unconditional Security The strongest security model is unconditional security also denoted as perfect security by Shannon [Sha49]. An adversary should not be able to gain any information from the ciphertext, even if she is granted unlimited resources. That means – analogous to indistinguishability – by learning the ciphertext, the adversary may not gain any information about the related plaintext. By defining an empty message it is also possible to hide the information if or that information has been transmitted.

The list of following common passive attacks is by no means exhaustive. Attacks on the Encryption Scheme Brute-Force Attack The brute-force attack is also known as exhaustive key search attack. The attacker’s strategy is to find the used key by searching through the space of all possible keys until the correct one is found. Its practical feasibility depends on the size of the key space, the rate with which keys can be tested, and the ability to determine the correct key when testing. The most obvious way to determine the key is if the attacker possesses a plaintext/ciphertext-pair.

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