What is
What is. Digital Certificate It is an identity.
Mar 26, 2015
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Transcript
What is
Digital Certificate
It is an identity.
It is…
From webopedia An attachment to an electronic message used for security purposes. The most common use of a
digital certificate is to verify that a user sending a message is who he or she claims to be, and to provide the receiver with the means to encode a reply. An individual wishing to send an encrypted message applies for a digital certificate from a Certificate Authority (CA). The CA issues an encrypted digital certificate containing the applicant's public key and a variety of other identification information. The CA makes its own public key readily available through print publicity or perhaps on the Internet.
The recipient of an encrypted message uses the CA's public key to decode the digital certificate attached to the message, verifies it as issued by the CA and then obtains the sender's public key and identification information held within the certificate. With this information, the recipient can send an encrypted reply.
From WhatIs.com A digital certificate is an electronic "credit card" that establishes your credentials when doing
business or other transactions on the Web. It is issued by a certification authority (CA). It contains your name, a serial number, expiration dates, a copy of the certificate holder's public key (used for encrypting messages and digital signatures), and the digital signature of the certificate-issuing authority so that a recipient can verify that the certificate is real. Some digital certificates conform to a standard, X.509. Digital certificates can be kept in registries so that authenticating users can look up other users' public keys.
Definitions
Mess
An electronic
ID card
for Identify
To Identify
You
What can
represent you?
Verbal..
ID card
Driving License
Signature
3
(1)
Uniqueness
(2)
Related to you
ID card
ID card
(3)
Authorities
Trust Party
Trust
Authorities
Internet
You
Verbal..
MSN
─→
Trust…no more
E-commerce
Who are You
?
Digital
ID card
Driving License
Digital Signature
Digital Certificate
End section [Background]
System
PKI
(Public Key Infrastructure)
Design
For identify
Digital Signature
Digital Certificate
How it works?
Sender...encrypt…send ..his…signature and cert…..to server…CA confirms it.. receiver check…. the..…result…decrypt…get the message..etc.etc.etc…
Example
David
Juno
Juno’s Private Key
Lese piks S! C! lnestsso’s
Let’s skip CS lessons !!
David
CA
(Certificate Authority)
Third Trust Party
CK Company
certificate and a randomly generated data which has encrypted with his private key to the CA
The CA will check the certificate with its database and use the public key to decrypt the data.
The encrypted data act like a digital signature and can be thought of as evidence provided by the user.
So if the certificate is true and the data is decrypted, the user then gets the authentication from the CA.
Old School
Public
Private
However…
Efficiency
PKI
C C2
Server
End section [System]
Deeper…
Theory
1.
The encryption
What is
Public
Private ?
Sorry.
Covered
End section [Theory]
Last Part
Certificate Authority
How to
Choose
That “word” again
Trust
- History
- Trustworthy
- Cost
End[Presentation
]
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