There are several easy techniques you can use to make it unrecognizable, by putting the numbers in a code. It does not have to be NSA-proof, but will foil those scanning for credit card numbers.
Credit card numbers usually have 16 digits, but we can disrupt this pattern.
Credit Card Encryption Technique
|1. Additional Characters - Adding a random letter of the alphabet to each 4 digit sequence with a random letter or punctuation. The recipient simply ignores any non-number.||1234A-5678B-90%12C-34?56D
|2. Backwards - enter the credit card number backwards||6543-2109-8765-4321 Exp. 21/01|
|3. Scramble 4 - Each 4 letter sequence is backwards||4321-8765-2109-6543 Exp: 0121|
2 =A or B or C
3 =D or E or F
4 =G or H or I
5 =J or K or L
6 =M or N or O
7 =P or Q or R or S
8 =T or U or V
9 =W or X or Y
0 =Z or * or #
Example: 1ADG-JMPT-WZ1B-EHKN Exp. 1C/1Z
1 looks like a lower case L
NOTE: If you use a code, please use extra care to ensure accuracy and
consistency, so as not to delay the fulfillment of your order.