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Which of the following is an encryption algorithm that encrypts one bit at a time.
DES
Both RC4 and DES
AES
RC4
3DSA
The correct answer is stream cipher. A stream cipher algorithm type generates a key stream which is XOR'd with plaintext for encryption purposes. A key stream generator creates random values for encryption purposes, initialization vectors increase randomness for cryptographic functions, block ciphers encrypt blocks of data.
(DES can encrypt 1 bit at a time using certain modes). Then it should include that mode because: "DES is a 64 bit block cipher which means that it encrypts data 64 bits at a time. This is contrasted to a stream cipher in which only one bit at a time (or sometimes small groups of bits such as a byte) is encrypted. ... It was finally adopted in 1977 as the Data Encryption Standard - DES (FIPS PUB 46)."
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