Operating instructions

TD 92579GB
2009-04-15/ Ver. B
Installation and Operation Manual
IP-DECT Base Station & IP-DECT Gateway (software version 3.0.x)
15
4.1.3 Cryptography
Cryptography is the encoding of messages to render them unreadable by anyone other
than their intended recipient(s). Modern cryptography uses complex algorithms
implemented on modern computer systems.
Cryptography tasks can be divided into the two general categories Encryption and
Authenitication.
Encryption
Encryption is the scrambling of information so that the original message cannot be
determined by unauthorized recipients by applying an encryption algoritm to the message
plaintext producing ciphertext (appearently random bits). A decryption algoritm, if given
the correct key, converts the ciphertext back into plaintext. Public key algoritms use paired
keys, one for encryption and another for decryption.
Authentication
Authentication is the verification of a message’s sender. This requires the message to be
protected so it cannot be altered, usually by generating a digital signature formed by a
hash of the message. Only the correct key can generate a valid signature.