Khác biệt giữa các bản “Chữ ký điện tử”

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* [http://www.pgpi.org/doc/guide/7.0/en/intro/ Introduction to cryptography] from the PGP international website
* [http://specs.openoffice.org/appwide/security/Electronic_Signatures_and_Security.sxw OpenOffice Electronic Signatures and Security specification (OpenOffice format)], also in [http://bcn.boulder.co.us/~neal/i2/OpenOffice_Electronic_Signatures_and_Security.pdf pdf format]. Incorporates standards for document format and XML Digital Signatures. Includes a comparison of document signature software and features from Adobe (Acrobat), Microsoft (Word) and Mozilla.
* Bảng giá [[www.chukysotphcm.com/2013/08/bang-gia-chu-ky-so.html|Chữ ký số]] Nacenconm (CA2) [http://www.chukysotphcm.com/2013/10/ke-khai-thue-qua-mang.html kê khai thuế qua mạng] cho doanh nghiệp.
 
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