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Lesson: Physical tamering against -- Paper based ( Ntc, NCELL like... ) Scratched off Card.
From: Bipin Gautam <bipin.gautam () gmail com>
Date: Tue, 15 Mar 2011 20:50:21 +0530
Disclaimer: With balance-transfer option around this hack can be misused to ROB... real CASH in thousands(as balance-transfered for cash), nevertheless this demonstration is just meant as information AS lock-picking information (googleing?) is to doing actual burglary! With liberty comes responsibility....... and while Information is Innocent and its upto the perceivers how they use/misuse...... Demonstration from Tv (Fast forward to, 12.45minutes.... to jump to the news. Video is mislead, trick undisclosed) : http://canadanepal.net/youtube.php?v=BkAStXIX0hY Original Discussion :https://groups.google.com/group/nepsecure/t/da9d5c2409137ff7 Solution : https://groups.google.com/group/nepsecure/msg/ed67aaa042799576 Screenshot: https://nepsecure.googlegroups.com/attach/ed67aaa042799576/Nepal+Telecom+Scratched+Card+Hack.JPG Migration: If i remember older NTC recharge cards came as plastic card, which could have already migrated from this loophole. While... my cause was not to contribute to global warming, or rely on a do-not-talk;do-not-know dodo..... defense..... and printing PIN Code over paper is still a greener choice, NTC, NCELL etc... could also use a small plastic slip instead (rectangular, opaque) to print the PIN code over it and slip it in in-between the paper to minimize plastic use. Alternatively, the edges of the Hard-paper recharge cards can be PRODUCED strong "razor thin" on the edges, and gradually thicker on the centre (like a pyramid top to hold PIN) with a safe margin. I think, its better to use just fine tearaway paper no plastic lamination on the top... (with few breakable bands... like alu-plus (o & x criss-cross game) to conceal the number in inbetween. Affected: (though the papers are < .4 -.5 mm) It is difficult to tamper and re-master the water-marked scratch-off coting (With telecom name printed on it). [Difficulty] Simple -- NTC 500-1000 Rs recharge card (because: good hardcover over pink plastic lamination) Medium : Other NTC recharge chards of any value, still thick paper... blade can easily slip through to slice it carefully. Though, NCELL recharge cards have thinner papers (guess ~1/3 mm?) the paper are strong, fibrous... so doable. Thanks, -bipin _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
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- Lesson: Physical tamering against -- Paper based ( Ntc, NCELL like... ) Scratched off Card. Bipin Gautam (Mar 15)