Glossary
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TAINY iQ
Datagram
With the transfer protocol TCP/IP, data is sent as data packages, so-called
IP datagrams. An IP datagram has the following structure:
1. IP header
2. TCP/UDP header
3. Data (payload)
The IP address contains:
the IP address of the sender (source IP address)
the IP address of the recipient (destination IP address)
the protocol number of the protocol of the next higher protocol layer
(according to the OSI layer model)
the IP header check sum (checksum) for verifying the integrity of the
header on receipt.
The TCP/UDP header contains the following information:
Port of the sender (source port)
Port of the recipient (destination port)
a check sum over the TCP header and some information from the IP
header (including source and destination IP address)
DES / 3DES
The symmetric encryption algorithm (
symmetric encryption) DES,
originating from IBM and tested by the NSA, was established in 1977 by the
American National Bureau of Standards, the predecessor of today's National
Institute of Standards and Technology (NIST) as a standard for American
governmental institutions. Since it was the first standardised encryption
algorithm, it was also quickly adopted in industrial applications in the US and
beyond.
DES works with a key length of 56bit, which can no longer be considered to
be secure due to the increase in computing capability of the computer since
1977.
3DES is a variant of DES. It works with keys three times the size, they are
168 bits long. It is still considered to be secure and is also a part of the IPsec
standard, among other things.
DHCP
Dynamic Host Configuration Protocol (DHCP) assumes the automatic
dynamic assignment of IP addresses and additional parameters in a
network. The Dynamic Host Configuration Protocol uses UDP. It was
defined in RFC 2131 and assigned with the UDP ports 67 and 68. DHCP
works in the client
– server method, wherein the client is assigned the IP
address by the server.
DNS
The addressing in IP networks takes place over IP address as a basic rule.
However, addressing in the form of a domain address is generally preferred
(in the form www.abc.xyz.de). The addressing takes place over the domain
address. First the sender sends the domain address to a Domain Name
Server (DNS) and receives the corresponding IP address. Only afterwards
does the sender address its data to this address.
Summary of Contents for TAINY IQ-LTE
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