At the OSI Application Layer

SET – Secure Electronic Transaction

• Originated by Visa and Mastercard
• Being overtaken by SSL

SHTTP – Secure HTTP

• Early standard for encrypting HTTP documents
• Also being overtaken by SSL

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At the OSI Transport Layer

SSH-2

• SSH has RSA certificates
• Supports authentication, compression, confidentiality and integrity
• DES encryption
• Because Secure Shell (SSH-2) supports authentication, compressions, confidentiality and integrity, SSH is used frequently for Encrypted File Transfer

SSL – Secure Socket Layer

• Contains SSL record protocol and SSL Handshake Protocol
• Uses symmetric encryption and public key authentication
• MAC – Message Authentication Code for Integrity

SKIP – Simple Key Management for Internet Protocol  - Similar to SSL with no prior communication required

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