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This field is sometimes referred to as a “CRL distribution point”. One such field indicates whether the certificate 20 can legally be used as a server in the SSL authentication process. This is the public key of the computer 2 that presented the digital certificate 20.
The public key is paired with a private key so that techniques of public key cryptography (as that term is normally defined) can be employed.
The two fields described immediately above are referred to as the “signing block” 29.
illustrates apparatus suitable for carrying out the present invention.
The fields described above are referred to collectively as the “certificate proper” 28. The signing authority (SA) is the entity that vouchsafes the authenticity of the digital certificate 20.
The SA's digital signature is formed by the signing authority using a hash function to create a message digest of the certificate proper 28, then encrypting said message digest using its private key. This digital certificate is used by third parties to verify the legitimacy of the signing authority, and typically contains the same or similar fields as certificate proper 28, including the public key of the SA.
However, the Common Name can also be the IP (Internet Protocol) address (e.g., .61) of the computer 2 that presented the certificate 20. This is the date that the digital certificate 20 was issued by the Signing Authority (SA), the entity that digitally signed the certificate 20. This is the date on which the digital certificate 20 will expire.
After the expiration date, the digital certificate 20 should not be further used or accepted.
What is needed is a way to determine when SSL stripping is appropriate and when it is not appropriate. Computer-implemented methods, apparati, and computer-readable media for thwarting computer attacks.
Name and Location of Certificate Revocation List (CRL).
This is the name and location associated with a list 24 that publishes IDs of digital certificates 20 that have been revoked. These fields indicate certain attributes of the digital certificate 20.
Tunneling using SSL allows a compromised host computer to communicate through the enterprise firewall, and the strong encryption provided by SSL prevents security software from examining and recognizing the dangerous contents of that traffic.
One solution to this problem is known as “SSL stripping”.