Cryptographie : Pourquoi, comment ? : Cryptographie au quotidien : PGP Themer by MyColorScreen Flash Crash Analysis - May 6'th 2010 - Intro - Empirical Analysis - Answers - Nanex 07-08-2010: We have added new data and information regarding the Flash Crash. In order to keep our report in-tact as originally published, please CLICK HERE for all new Flash Crash related information from Nanex. On the afternoon of May 6, 2010 the Dow Jones Industrial Average (DJIA) dropped approximately 600 points (5.7%), and then quickly recovered. Other Major Market Indexes dropped by similar amounts. We have read numerous articles attempting to explain this event including the SEC report "Preliminary Findings Regarding the Market Events of May 6, 2010" dated May 18, 2010. Our report assumes the reader is familiar with the SEC report. Our business is supplying a real-time data feed comprising trade and quote data for all US equity, option, and futures exchanges. We generated over 4,500 datasets and over 1,200 charts before uncovering what we believe precipitated the swift 600 point drop beginning at 14:42:46 and ending at 14:47:02.
Comment supprimer mes données bancaires sur iTunes? Vous prêtez votre iPhone à un ami? Vous souhaitez mettre un terme aux achats inconsidérés des enfants sur iTunes? Pensez à effacer vos coordonnées bancaires de la boutique en ligne d'Apple. ● À partir d'un iPhone ou d'un iPad, ouvrez les Réglages, puis choisissez dans la liste «iTunes Store et App Store». Appuyez alors sur votre identifiant Apple. ● Dans la page de votre compte Apple, appuyez sur «Facturation». ● À partir d'un ordinateur, lancez iTunes et déroulez le menu Store pour choisir «Voir le compte». ● Une fois vos coordonnées bancaires effacées, vous ne pourrez plus payer d'articles sur iTunes.
RedNotebook Chip and PIN security busted High performance access to file storage Security researchers have demonstrated a gaping security hole in Chip and PIN credit card authorisations which undermines trust in the technology as a means to verify retail purchases. Cambridge University security researchers have demonstrated how it might be possible to trick the card into thinking it’s doing a chip-and-signature transaction while the terminal thinks it’s authorised by chip-and-PIN. The flaw creates a means to make transactions that are "Verified by PIN" using a stolen (uncancelled) card without knowing the PIN number. Fraudsters would insert a "wedge" between the stolen card and terminal, tricking the terminal into believing that the PIN was correctly verified. It's not surprising that the attack works when a terminal is offline but it works when the terminal is connected too. The man-in-middle attack outlined by the Cambridge researchers doesn’t work at ATMs but it can work regardless of the amount spent in retail transactions.
Sécurité - Protéger un ordinateur contre les malwares Afin de lutter contre tous types d'infections, de se protéger efficacement, de désinfecter son PC, il est nécessaire de disposer de certains logiciels et programmes dont je vais essayer de vous expliquer leur utilité. I - Antivirus/Pare-feu Qu'est-ce qu'un antivirus ? Un antivirus est un programme capable de détecter la présence de virus sur un ordinateur et, dans la mesure du possible, de désinfecter ce dernier. Chaque ordinateur, pour assurer sa sécurité sur Internet, doit disposer d'un seul antivirus et d'un seul pare-feu (firewall) (plusieurs antivirus ou plusieurs pare-feux créent des conflits...). Le choix d'antivirus : selon les personnes et les attentes, l'antivirus le plus performant varie. Avast (gratuit) - Tutoriel Avira / AntiVir (gratuit) - Tutoriel et réglage maximum AVG (gratuit) - Tutoriel Kaspersky (payant) NOD32 (payant) BitDefender (payant) BitDefender 2013 Free Edition (version gratuite). Les antivirus gratuits sont téléchargeables ici. Conseil pour un pare-feu :
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