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An organization that issues digital certificates and signs them with its
private key.
A list of certificates that have become invalid before their natural
expiration. This may happen if somebody finds out the certificate owner's private key. The list must be stored on a highly available
server.
A message digest that has been encrypted using a person's (called the signer)
private key. The signature is sent with the message. The receiver can then
calculate the digest himself and decrypt the signature using the sender's
public key to obtain another digest. If the two match, the signer must
be have the corresponding private key and the message could not have been
altered.
A file that binds a public key to an identity. The file contains informations
such as name, validity dates, the public key and issuer. This all is digitally
signed by the issuer. The validity of the certificate can be checked as
any digitally signed message. The issuer's, called the certificate authority,
public key can be for example published in a newspaper. There can be several
layers of certificate authorities.
A term that is sometimes used of a symmetric session
key that has been encrypted using the receiver's public key.
Hypertext markup language. The format into which the description of world wide web pages has been written.
Hypertext transfer protocol. An agreement on how the HTML files are transferred through the Internet.
A way of key distribution where the key is delivered through the route
which is wished to be encrypted. The idea is to distribute keys for future
sessions in an encrypted session (for which the key was given in a past
session).
IP
Internet protocol, an agreement about how to transfer data packets in the
Internet.
A way of key distribution where the key is delivered through some other
route except that which is wished to be encrypted. The key can be sent
by letter.
A key for a symmetric encryption algorithm that is specific to certain
session. Because the key is different for every session, security is enchanced.
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Sivua on viimeksi päivitetty 15.11.1999 16:45.
URI: http://www.netlab.tkk.fi/opetus/s38118/s99/htyo/1/term.shtml
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