| Summary: | 碩士 === 國立臺灣科技大學 === 電子工程系 === 88 === Most stream cipher systems are based on symmetric cryptosystem. Very few Public-Key-Stream-Cipher systems, which are based on public-key algorithms have been proposed. We try to merge public key cryptosystem and stream cipher system together. And, in this thesis, we propose two types of Public-Key-Stream-Cipher systems:
(1)Exponential computational encryption/decryption Public-Key-
Stream-Cipher systems
In this system, the encryption key stream is formed by the
exponential computation of the public key of decrypter; the
decryption key stream is formed by the exponential
computation of the corresponding private key.
(2)Easy computational encryption/decryption Public-Key-Stream-
Cipher systems
In this system, through key exchange process, encrypter can
get session key by his private key and the public key of
decrypter; also, decrypter can get the same session key by
his private key and the public key of encrypter. Both sides
use the same session key going through the same key stream
generator and hash function, and then get the same
encryption/decryption key stream at an appropriate length
to encrypt/decrypt message.
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