Q. Which operation is used in encryption using IDEA?

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Q. The key size of DES is

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Q. These three ciphers can operate of ______ of plaintext and cipher text.

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Q. Which block cipher has key length of 128 bits?

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Q. PGP offers _____ block ciphers for message encryption.

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Q. Data compression includes

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Q. For digital signatures private key cryptosystem is used.

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Q. Public key cryptosystem is used for the encryption of

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Q. Pretty good privacy (PGP) security system uses

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Q. Euler’s totient function is determined by

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Q. Public key cryptosystem is also known as

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Q. Which should be kept as a secret in public key cryptosystem?

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Q. Public key cryptosystem uses same key for both encryption and decryption.

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Q. Synchronous ciphers uses

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Q. In which method, key-stream is generated independently?

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Q. In stream encryption, the key sequence repeats itself.

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Q. In cipher feedback method, encryption is done on

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Q. The substitution of the letters are done

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Q. In transposition, the plaintext letters are

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Q. For n input bits the number of substitution patterns are

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