Dynamic card validation value

A computer-readable medium comprising instructions that, when executed by a processor, cause an electronic computing system including a card processing server to:

• automatically select a dynamic service code such that the dynamic service code is substantially unpredictable based on previously requested dynamically-generated card verification values (CVVs) for a transaction card;
• automatically generate a dynamically-generated CVV for the transaction card, wherein the dynamically-generated CVV is based on a card number of the transaction card, an expiry date of the transaction card, and the dynamic service code, and wherein the instructions cause the card processing server to:
• concatenate the card number of the transaction card, the expiry date of the transaction card, and the dynamic service code, thereby generating a first value;
• pad the first value with zeroes such that the first value includes 128 bits, thereby generating a second value;
• split the second value into a first 64-bit block and a second 64-bit block;
• encrypt the first 64-bit block with a first encryption key, thereby generating a third value;
• perform an “exclusive or” operation on the third value and the second 64-bit block, thereby generating a fourth value;
• encrypt the fourth value with the first encryption key, thereby generating a fifth value;
• decrypt the fifth value with a second encryption key, thereby generating a sixth value;
• encrypt the sixth value with the first encryption key, thereby generating a seventh value;
• extract all numeric digits in the seventh value, thereby generating an eighth value;
• extract all alphabetical digits in the seventh value, thereby generating a ninth value;
• convert the ninth value into numeric digits, thereby generating a tenth value;
• concatenate the eighth value and the tenth value, thereby generating an eleventh value;
• and
• select a leftmost three digits of the eleventh value as the dynamically-generated CVV;
• automatically send, from the card processing server to a cardholder device, a first set of data, the first set of data indicating the dynamically-generated CVV;
• in response to receiving a transaction request, automatically determine whether a provided CVV corresponds to the dynamically-generated CVV, the transaction request is a request for an economic transaction, the transaction request specifying the provided CVV and a card number of the transaction card;
• and
• record a charge against an account of a cardholder of the transaction card when it is determined that the provided CVV corresponds to the dynamically-generated CVV.