How to encrypt/decrypt 4 character field in ABAP?

Hello SDN Community,
I have done extensive searches before posting this. Have even explored fuction modules FIEB_PASSWD_ENCRYPT/DECRYPT. Even looked at SSF Developers Guide - chapter 4. The FIEB function modules were dead-end. SSF looks like it concerns securing of documents or files. Talks about certificates.
I also looked at the SSF_BASE64_ENCRYPT/DECRYPT function modules on my system, which is ECC 6.0. Wasn't sure if they could be used on a stand-alone basis, plus I couldn't find any documentation about them.
I only want to encrypt, and then decrypt, the values in a 4 character field.
eg- DATA: MYFIELD(4) TYPE C.
Is there an ABAP function module, or coding example, that would demonstrate this?
Or possibly I overlooked something in the information that I have already found?
Thank you,
Dean Atteberry.

Hi Morten,
I would recommend reading the comments to the blog as well, as there would not be much difference between a 4 char field and...
*-- check string-to-string algorithms
string_in = 'Au weia, der Hahn legt keine Eier'. "#EC NOTEXT
string_out = test_object->encrypt_string2string( string_in ).
string_expected = 'AQYRHTFUERodER9UABMRGFQaHBU8VAYREFRYFR0RA1QBNQ=='.
if string_out <> string_expected.
result = abap_false.
return.
endif.
...if the result can be expected (in any SAP system) or easily reversed.
But it might fullfill a requirement for obfuscation, which is what I was asking as well.
Cheers,
Julius

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