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![Cover for Gerrit Bleumer · Electronic Postage Systems: Technology, Security, Economics - Advances in Information Security (Paperback Book) [2007 edition] (2014)](https://imusic.b-cdn.net/images/item/original/672/9781489986672.jpg?gerrit-bleumer-2014-electronic-postage-systems-technology-security-economics-advances-in-information-security-paperback-book&class=scaled&v=1602809376)
![Cover for Gerrit Bleumer · Electronic Postage Systems: Technology, Security, Economics - Advances in Information Security (Hardcover Book) [2007 edition] (2006)](https://imusic.b-cdn.net/images/item/original/134/9780387293134.jpg?gerrit-bleumer-2006-electronic-postage-systems-technology-security-economics-advances-in-information-security-hardcover-book&class=scaled&v=1409963559)