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Which of the following is not an example of block cipher
RC4
Skipjack
IDEA
Blowfish
The correct answer is RC4 as it is not an example of a block cipher. Because RC4 is a stream cipher. Stream Cipher is more malleable than common block ciphers. If not used together with a strong message authentication code (MAC), then stream cipher encryption is vulnerable to a bit-flipping attacks. https://en.wikipedia.org/wiki/RC4
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