| slovo | definícia |
handshake
(encz) | handshake,potřesení rukou Zdeněk Brož |
handshake
(encz) | handshake,stisk n: Zdeněk Brož |
handshake
(wn) | handshake
n 1: grasping and shaking a person's hand (as to acknowledge an
introduction or to agree on a contract) [syn: handshake,
shake, handshaking, handclasp] |
handshake
(foldoc) | handshaking
handshake
1. Predetermined hardware or software activity designed to
establish or maintain two machines or programs in
synchronisation. Handshaking often concerns the exchange of
messages or packets of data between two systems with limited
buffers. A simple handshaking protocol might only involve
the receiver sending a message meaning "I received your last
message and I am ready for you to send me another one." A
more complex handshaking protocol might allow the sender to
ask the receiver if he is ready to receive or for the receiver
to reply with a negative acknowledgement meaning "I did not
receive your last message correctly, please resend it" (e.g. if
the data was corrupted en route).
Hardware handshaking uses voltage levels or pulses on wires
to carry the handshaking signals whereas {software
handshaking} uses data units (e.g. ASCII characters) carried
by some underlying communication medium.
Flow control in bit-serial data transmission such as
EIA-232 may use either hardware or software handshaking.
2. The method used by two modems to establish contact with
each other and to agreee on baud rate, error correction
and compression protocols.
3. The exchange of predetermined signals between agents
connected by a communications channel to assure each that it
is connected to the other (and not to an imposter). This may
also include the use of passwords and codes by an operator.
[Jargon File]
(1995-01-13)
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| | podobné slovo | definícia |
golden handshake
(encz) | golden handshake, |
handshakes
(encz) | handshakes,potřesení rukou pl. Zdeněk Brož |
golden handshake
(wn) | golden handshake
n 1: a lucrative severance agreement offered to an employee
(usually as an incentive to retire) |
challenge-handshake authentication protocol
(foldoc) | Challenge-Handshake Authentication Protocol
CHAP
(CHAP) An
authentication scheme used by PPP servers to validate the
identity of the originator of the connection upon connection
or any time later.
CHAP applies a three-way handshaking procedure. After the
link is established, the server sends a "challenge" message to
the originator. The originator responds with a value
calculated using a one-way hash function. The server checks
the response against its own calculation of the expected hash
value. If the values match, the authentication is
acknowledged; otherwise the connection is usually terminated.
CHAP provides protection against playback attack through the
use of an incrementally changing identifier and a variable
challenge value. The authentication can be repeated any time
while the connection is open limiting the time of exposure to
any single attack, and the server is in control of the
frequency and timing of the challenges. As a result, CHAP
provides greater security then PAP.
CHAP is defined in RFC 1334.
(1996-03-05)
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