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Adobe Acrobat Sign (formerly EchoSign, eSign & Adobe Sign) is a cloud-based e-signature service that allows the user to send, sign, track, and manage signature processes using a browser or mobile device. [4] It is part of the Adobe Document Cloud suite of services.
One digital signature scheme (of many) is based on RSA. To create signature keys, generate an RSA key pair containing a modulus, N, that is the product of two random secret distinct large primes, along with integers, e and d, such that e d ≡ 1 (mod φ(N)), where φ is Euler's totient function.
%!PS-Adobe-3.0 ESPF-3.0: 0 eps epsf Encapsulated PostScript file version 3.0 [34] 25 21 50 53 2D 41 64 6F 62 65 2D 33 2E 31 20 45 50 53 46 2D 33 2E 30 %!PS-Adobe-3.1 ESPF-3.0: 0 eps epsf Encapsulated PostScript file version 3.1 [35] 49 54 53 46 03 00 00 00 60 00 00 00: ITSF␃␀␀␀`␀␀␀ 0 chm MS Windows HtmlHelp Data: 3F 5F?_ 0 hlp
Role-based certificate: Defined in the X.509 Certificate Policy for the Federal Bridge Certification Authority (FBCA), role-based certificates "identify a specific role on behalf of which the subscriber is authorized to act rather than the subscriber’s name and are issued in the interest of supporting accepted business practices." [26]
The malicious certificate can even contain a "CA: true" field making it able to issue further trusted certificates. MD2-based certificates were used for a long time and were vulnerable to preimage attacks. Since the root certificate already had a self-signature, attackers could use this signature and use it for an intermediate certificate.
The client uses the CA certificate to authenticate the CA signature on the server certificate, as part of the authorizations before launching a secure connection. [3] Usually, client software—for example, browsers—include a set of trusted CA certificates. This makes sense, as many users need to trust their client software.