# des

DES (Data Encryption Standard) is a cryptographic algorithm that transforms data into a cipher and back to its original form.

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## How CVV, CVV2, and CVC Values Are Calculated

DevFeed: [How CVV, CVV2, and CVC Values Are Calculated](<https://devfeed.tech/articles/cvv-numbers-35284.md>)

Original publisher: [Read original article](<https://darkcoding.net/credit-card/cvv-numbers/>)

Author: Graham King

Published: 2005-10-23T16:46:27Z

Content type: article

Language: en

Sources: [Graham King](<https://devfeed.tech/sources/graham-king.md>)

Topics: [Algorithm](<https://devfeed.tech/topics/algorithm.md>), [des](<https://devfeed.tech/topics/des.md>), [account](<https://devfeed.tech/topics/account.md>), [Network](<https://devfeed.tech/topics/network.md>)

Tags: [account](<https://devfeed.tech/tags/account.md>), [algorithm](<https://devfeed.tech/tags/algorithm.md>), [bank](<https://devfeed.tech/tags/bank.md>), [batch](<https://devfeed.tech/tags/batch.md>), [card](<https://devfeed.tech/tags/card.md>), [concatenation](<https://devfeed.tech/tags/concatenation.md>), [credit-card](<https://devfeed.tech/tags/credit-card.md>), [des](<https://devfeed.tech/tags/des.md>), [format](<https://devfeed.tech/tags/format.md>), [network](<https://devfeed.tech/tags/network.md>), [numbers](<https://devfeed.tech/tags/numbers.md>), [parameter](<https://devfeed.tech/tags/parameter.md>), [payment](<https://devfeed.tech/tags/payment.md>), [value](<https://devfeed.tech/tags/value.md>), [verification](<https://devfeed.tech/tags/verification.md>)

### AI overview

This article explains that CVV, CVV2, CVC, and Indent CVC are three-digit card verification values calculated with the same CVV algorithm. It describes the inputs, including the card number, expiration date, service code, and DES keys, and explains variations involving card batches, service codes, and expiration-date formats.

### Source excerpt

Unraveling the mysteries of card verification values.