1. A method for selective decryption within an encrypted document, said method comprising: detecting an encrypted portion of a document, said encrypted portion having been selected and marked for decryption, said encrypted portion being an encryption of a text portion of the document, said text portion comprising a known character string that had been added to the text portion prior to the text portion being encrypted; receiving a selection of a valid key configured to decrypt the encrypted portion; ascertaining that an attempt to convert the encrypted portion into a decrypted portion of the document by decrypting the encrypted portion using the valid key was successful, said ascertaining comprising determining that the decrypted portion includes the known character string; in response to said ascertaining, removing the known character string from the decrypted portion; and after said removing the known character string, displaying the encrypted portion.