Strength of self-encrypted password Hello, I try to find information on the strength of a password encrypted with a symetric key where the encrypted password itself is used as passphrase to the symetric key. Example: let createKey( Passphrase ) be secretKey let encrypt( secretKey, Data ) be encryptedData Then, how secure the following is: encrypt( createKey( "secret" ), "secret" ) ? Maybe it is important to know that it will be common knowledge that "secret" is the encrypted data while "secret" is also the passphrase to the key. I googled the web for quite some time, also scanned academic journals in the library but could not find any information on the strength of a symetric key algorithm when the passphrase itself is the encrypted item. Thank you very much Bjoern | 
