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我知道他們都是串流加密(stream cipher)




1 Answer

  • Rock
    Lv 6
    1 decade ago
    Favorite Answer

    A4 is cipher developed by R. Rivest for RSA Data Security, Inc. It is proprietary, and its detail have not been officially published, and RC4 avariable-key-size stream cipher (the key size may vary between 1 up to 2048 bits). RC4 is used a lot today; you can find it, for example, in secure socket layer/SSL, in WiFi security protocols, etc.

    A5/1 is the symmetric cipher used for encrypting over-the air transmission in the GSM standard. A5/1 is used in most European countries, whereas a weaker cipher, called A5/2, is used in other countries. The description of A5/1 was first kept secret but its design was revered engineered in 1999 by Briceno, Golgerg, and Wagner. A5/1 is a synchronous stream cipher based on linear feedback shift registers (LFSRs)

    Source(s): Encyclopedia of Cryptography and Security, Myself.
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