RC4 is the name of a symmetric key stream cipher algorithm.
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Public Key Cipher
Public key is also known as public-private key. A cryptographic algorithm which uses two different keys to encrypt and decrypt information. Data encrypted using one key can be decrypted using the other key. The mechanism works in reverse as well. Typically, one key is kept private; while the other key is distributed to the public.
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“To alter (a file, for example) using a secret code so as to be unintelligible to unauthorized parties.” The American Heritage® Dictionary of the English Language, Fourth Edition, Copyright © 2000 by Houghton Mifflin Company. See Cipher.
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