Q. In Vigenere method ______ is provided.

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Q. A cipher system is said to have perfect secrecy if

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Q. The conditions for perfect secrecy are

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Q. The _____ the uncertainty, the ______ is the information content.

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Q. The maximum number of message bits contained in each character is called as

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Q. When the key size is finite, equivocation approaches

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Q. When a system is called as unbreakable?

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Q. Which are called as substitution encryption techniques?

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Q. In substitution technique encryption protection is more.

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Q. The standard building block uses _______ of a key to transform 64-bit input into 64-bit output.

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Q. The 64 bit block input key has _____ number of parity bits.

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Q. One-time pad has

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Q. Perfect secrecy can be achieved for

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Q. The segment of the key-stream of plaintext is obtained by _____ of two sequences together.

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Q. In which method the key-stream is generated independently of the message?

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Q. In which method cipher feedback is used?

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Q. Spread spectrum multiple access techniques allows the multiple signal to be transmitted

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Q. In CDMA, the users share the bandwidth

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Q. Multi paths may be because of

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Q. For direct sequence systems what is the minimum required processing gain?

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