FILE SECURITY IN WORDPERFECT 5.0
H. A. Bergen, William Caelli · Cryptologia · 1991
Cryptanalysis of files encrypted with the locked document option of the word processing package WordPerfect V5.0, is shown to be remarkably simple. The encryption key and the plaintext are easily recovered in a ciphertext only attack. File security is thus compromised and is not in accord with the claim by the manufacturer that: “If you forget the password, there is absolutely no way to retrieve the document.”