Unencrypted information that may be input to an encryption operation.
Note: Plain text is not a synonym for clear text. See clear text.
Sources:
CNSSI 4009-2015
under plain text
from
IETF RFC 4949 Ver 2 - Adapted
Information that is not encrypted.
Sources:
CNSSI 4009-2015
under clear text
from
ISO/IEC 7498-2
Information that is not encrypted.
Sources:
NIST SP 800-82r3
Intelligible data, the semantic content of which is available.
Sources:
NISTIR 5153
under Clear-text
from
ISO DIS 10181-2