COMPUTER ETHICS AND SECURITY
CRYPTOGRAPHY AND ENCRYPTION
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 Question 
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 Stream ciphers means 
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  Encrypt digits 
 
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  Encrypt letters 
 
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  Encrypt digits or letters 
 
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 None of the above
 
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 Explanation: 
Detailed explanation-1: -A Stream Cipher can be used for symmetric key cryptography, or when the similar key is used to encrypt and decrypt data.
Detailed explanation-2: -A stream cipher encrypts a continuous string of binary digits by applying time-varying transformations on plaintext data. Therefore, this type of encryption works bit-by-bit, using keystreams to generate ciphertext for arbitrary lengths of plain text messages.
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