Notes for Computer Information Technology 160
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November 21


If the public key of an ssh server changes you will get a DNS spoofing warning.

ssh-keygen is a tool for creating new authentication key pairs for SSH. Such key pairs are used for automating logins, single sign-on, and for authenticating hosts.


  • SSL 2.0 came out in 1995
  • SSL 3.0 came out in 1996
  • TLS 1.0 came out in 1999
  • TLS 1.2 came out in 2008 (9 years later)

  • https - the S can be SSL or TLS


Browser “get document A” <-> Server “Here’s document A”


  • Header
    • Request Line “verb subject HTTP/1.1”
    • Host:
  • Blank Line
  • Optional Body

  • Verbs

    • GET - get document
    • HEAD - get the head of a document only
    • PUT - add a document
    • POST - send a document, let the server decide what to do with it


  • Header
    • Status Line (like request line) “HTTP/1.1 200 OK”
  • Blank Line
  • Optional Body (with document)


Multiple Clients -> Forward Proxy -> Server -> Reverse Proxy -> Multiple Servers