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The Misuse of RC4 in Microsoft Word and Excel PDF Print E-mail
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Written by Giuseppe Bonfà   
Wednesday, 19 December 2007

This Report is not recent, but is very interesting under many aspects:

  • Well designed Analysis  Approach for a Generic CryptoTarget
  • Concrete Cryptanalysis and successive Attack
  • Evidence of Badly Designed Conceptual and Logical Crypto Architecture

 

 

 

In this report, we point out a serious security flaw in Microsoft Word and Excel. The stream cipher RC4 [9] with key length up to 128 bits is used in Microsoft Word and Excel to protect the documents.

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On RBN ( Russian Bank Network) Analysis PDF Print E-mail
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Written by Giuseppe Bonfà   
Friday, 07 December 2007

There are some places in the world where life is dangerous. Internet has some dark zones too and RBN is one of them. RBN stands for Russian Business Network and it’s a nebulous organisation which aims to fulfill cybercrime.

This study aims to provide some enlightenment on RBN activities and tries to give details how they work. Indeed RBN has many constituents and it’s hard to have an exact idea on the goal of some of them and the way they’re linked with other constituents. There are some countermeasures available but they don't make sense for home users or even companies. 


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Report on recent publications (#11) PDF Print E-mail
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Written by Giulia Biagini   
Tuesday, 04 December 2007
Report on the publications from the 8th of October to the 4th of December.
 
A novel public key crypto system based on semi-modules over quotient semi-rings (Reza Ebrahimi Atani, Shahabaddin Ebrahimi Atani, Sattar Mirzakuchaki)

 

Abstract.
In A generalization of the original Diffie-Hellman key exchange in (ℤ/pℤ)* found a new depth when Miller and Koblitz suggested that such a protocol could be used with the group over an elliptic curve. 
 
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Another look at automated theorem-proving PDF Print E-mail
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Written by Giulia Biagini   
Wednesday, 28 November 2007

I would like to bring  to your attention the last paper by Neal Koblitz: Another Look at Automated Theorem-proving.

The history of Automated Theorem-proving goes back to Leibniz time, and is now developed in several directions. One of these includes cryptology.

In his paper Koblitz compares the results obtained by different applications of this theory to the human-mades. More specifically the author discusses three papers related, respectively, to the Full-Domain Hash signatures, to the ElGamal encryption, and to the Cramer-Shoup encryption and asks whether computer-assisted proof-writing can contribute in their security analysis.

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'Half-quantum' cryptography promises total security PDF Print E-mail
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Written by Andrea Lelli   
Tuesday, 20 November 2007
 
We know that quantum key distribution is the only real and practical way to communicate securely. Several disadvantages are still limiting this technology, it is actually quite expensive to establish a quantum communication channel for Bob and Alice, unless... The same secure quantum communication can take place even if only one of the two sides is using a quantum communication device! The news appeared on NewScientist one month ago:
"It has been an article of faith among cryptographers that the only way for two parties to transmit sensitive information completely securely is to use quantum cryptography to share the key they use to encrypt the information.
 
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Cracking again PDF Print E-mail
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Written by Giulia Biagini   
Monday, 19 November 2007
 
Colossus machines were employed by British Codebreakers to decipher german messages during War World II, in Bletchley Park. Now, for the first time in more than 60 years, a Colossus computer is cracking codes again.
The news comes from BBC and it's nice not only from an historical perspective.
Trust for the National Museum of Computing organized a sort of challenge: radio amateurs in Paderborn (Germany) sent some radio messages using a Lorenz SZ42 machine and the re-built Colossus intercepted them, just like it used to happen in the past. 
   

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