Ver:
1. (I) /noun/ Data that is
input to an encryption process. (See: plaintext. Compare: cipher text, clear
text.) [RFC4949:2007]
Intelligible data that has
meaning and can be understood without the application of decryption.
[NIST-SP800-57:2007]
unencrypted information
[ISO/IEC 10116:1997]. [ISO-18033-1:2005]
unenciphered information.
[ISO/IEC ISO-9797-1:1999] [ISO-18033-3:2005]
A message written in regular
characters readable by all without any hidden or secret meaning.
http://www.nsa.gov/kids/ciphers/ciphe00006.cfm