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Transport Layer Security (TLS) is a cryptographic protocol designed to provide communications security over a computer network, such as the Internet.The protocol is widely used in applications such as email, instant messaging, and voice over IP, but its use in securing HTTPS remains the most publicly visible.
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AS2 is specified in RFC 4130 [3], and is based on HTTP and S/MIME.It was the second AS protocol developed and uses the same signing, encryption and MDN (as defined by RFC3798) conventions used in the original AS1 protocol introduced in the late 1990s by IETF.
Worldwide, the certificate authority business is fragmented, with national or regional providers dominating their home market. This is because many uses of digital certificates, such as for legally binding digital signatures, are linked to local law, regulations, and accreditation schemes for certificate authorities.
Bootstrapping secure communication protocols, such as Internet key exchange (IKE) and SSL/TLS. In both of these, initial set-up of a secure channel (a " security association ") uses asymmetric key —i.e., public key—methods, whereas actual communication uses faster symmetric key —i.e., secret key —methods;
The role of root certificate as in the chain of trust.. In cryptography and computer security, a root certificate is a public key certificate that identifies a root certificate authority (CA). [1]
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