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Which of the following is optimized for confidential communications, such as bidirectional voice and video?
MD5
MD4
RC5
RC4
MD4 and MD5 are both hashes. RC5 is a block cipher. That leaves RC4 (stream cipher) as the best answer. **Help: there is an RC-5 protocol that was developed by Philips, see https://en.wikipedia.org/wiki/RC-5. Is this different from the RC5 cipher? (EDIT: RC5 and RC-5 are completely unrelated.)
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