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Date: 2015-05-26 20:08:29 Public-key cryptography Payment systems Key management Financial cryptography E-commerce Lamport signature Smart card Digital signature David Chaum Cryptography Signature Debit card		llllllllllllllllillllllllllllllllllllllllllllllllllllllllllllllllllllllilli US005434919A United States Patent] Add to Reading List Source URL: www.chaum.com Download Document from Source Website File Size: 1,46 MB Share Document on Facebook

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