51,225 research outputs found
Endokrina tumörer - ett folkhälsoproblem?
No full textKan endokrina tumörer vara en av de större bakomliggande orsakerna till hjärtkärlsjukdom i Sverige och skall endokrinkirugin drastiskt öka för att motverka detta? En fråga som Per Hellman, professor i kirurgi vid Akademiska sjukhuset i Uppsala och tillika kirurgföreningens vetenskaplige sekreterare, väcker.</p
Monte Hellman. Ancora una strada per nessuna parte
No full textL'articolo discute il film Road to Nowhere di Monte Hellman alla luce delle caratteristiche della filmografia del regista
Security of discrete log cryptosystems in the random oracle and the generic model
No full textWe introduce novel security proofs that use combinatorial counting arguments rather than reductions to the discrete logarithm or to the Diffie-Hellman problem. Our security results are sharp and clean with no polynomial reduction times involved. We consider a combination of the random oracle model and the generic model. This corresponds to assuming an ideal hash function H given by an oracle and an ideal group of prime order q, where the binary encoding of the group elements is useless for cryptographic attacks In this model, we first show that Schnorr signatures are secure against the one-more signature forgery : A generic adversary performing t generic steps including l sequential interactions with the signer cannot produce l+1 signatures with a better probability than (t 2)/q. We also characterize the different power of sequential and of parallel attacks. Secondly, we prove signed ElGamal encryption is secure against the adaptive chosen ciphertext attack, in which an attacker can arbitrarily use a decryption oracle except for the challenge ciphertext. Moreover, signed ElGamal encryption is secure against the one-more decryption attack: A generic adversary performing t generic steps including l interactions with the decryption oracle cannot distinguish the plaintexts of l + 1 ciphertexts from random strings with a probability exceeding (t 2)/q
A NEW SECURITY SOLUTION IMPLEMENTED BY THE USE OF THE MULTILAYERED STRUCTURAL DATA SECTORS SWITCHING ALGORITHM (MSDSSA)
No full textThe present paper is a short extract from my PhD thesis and presents two different security field solutions: a conceptual one (an algorithm) and a practical one (a software application). I introduce the MSDSSA algorithm and a software application usable for encrypting different data files in the Microsoft Windows environment. The application was created as a new version of an application introduced at the time of my university graduation, upgraded to the second version for commercial use, upgraded to the third version at the time of some major modifications implementations in 2007 and now, finally, upgraded to its fourth version after the implementation of the MSDSSA algorithm.encryption key, cipher, code, methods and techniques for creating encryption results, attacks, cryptography, cryptanalysis, integration, security solutions, phishing
Ancora una strada per nessuna parte: Il budget è troppo basso per rivelarlo - Conversazione con Monte Hellman
No full textL'articolo discute il film Road to Nowhere di Monte Hellman alla luce delle caratteristiche della filmografia del regista
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