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.
View PostMessage Digest
A message digest is a mathematical function that creates a fixed length data item, also known as a one-way hash, in a PDF document when it is digitally signed. Any tampering or changes in the document will result in a different message digest alerting Acrobat or the Reader that the document has been changed.
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