Method of encryption.
Valid values:
| '0' | None / other |
| '1' | PKCS (proprietary) |
| '2' | DES (ECB mode) |
| '3' | PKCS/DES (proprietary) |
| '4' | PGP/DES (defunct) |
| '5' | PGP/DES-MD5 (see app note on FIX home page) |
| '6' | PEM/DES-MD5 (see app note on FIX home page) |
Used in: