81 research outputs found
Optimal Strategies for Static Black-Peg AB Game With Two and Three Pegs
The AB~Game is a game similar to the popular game Mastermind. We study a
version of this game called Static Black-Peg AB~Game. It is played by two
players, the codemaker and the codebreaker. The codemaker creates a so-called
secret by placing a color from a set of colors on each of pegs,
subject to the condition that every color is used at most once. The codebreaker
tries to determine the secret by asking questions, where all questions are
given at once and each question is a possible secret. As an answer the
codemaker reveals the number of correctly placed colors for each of the
questions. After that, the codebreaker only has one more try to determine the
secret and thus to win the game.
For given and , our goal is to find the smallest number of
questions the codebreaker needs to win, regardless of the secret, and the
corresponding list of questions, called a -strategy. We present a
-strategy for for all , and a -strategy for for all and show the optimality
of both strategies, i.e., we prove that no -strategy for a smaller
exists
Practical Padding Oracle Attacks on RSA
We revise attacks on the RSA cipher based on side-channels that leak partial information about the plaintext. We show how to compute a plaintext when only its parity is leaked. We then describe PKCS#1 v1.5 padding for RSA and we show that the simple leakage of padding errors is enough to recover the whole plaintext, even when it is unpadded or padded under another scheme. This vulnerability is well-known since 1998 but the flawed PKCS#1 v1.5 padding is still broadly in use. We discuss recent optimizations of this padding oracle attack that make it effective on commercially available cryptographic devices
The Chronicle [April 2, 2009]
The Chronicle, April 2, 2009https://repository.stcloudstate.edu/chron/1704/thumbnail.jp
The BG News February 18, 2008
The BGSU campus student newspaper February 18, 2008. Volume 98 - Issue 106https://scholarworks.bgsu.edu/bg-news/8882/thumbnail.jp
The Ticker, February 13, 2018
The Ticker is the student newspaper of Baruch College. It has been published continuously since 1932, when the Baruch College campus was the School of Business and Civic Administration of the City College of New York
- …