One-time code card

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One-time code card - a list of passwords used to authorize Internet transactions, usually banking. Each of the passwords listed on the card has a serial number and can only be used once - the system asks for a password of a specific number.

A one-time code card can be a plain paper sheet or similar to a credit card. Often, subsequent passwords are covered by a print or transparencies that are removed before use by showing a hidden password - this makes it easier to determine the amount of unused code. The password is usually a five- or six-digit number; The number of card fields is close to 40, for prints up to 100 and more.

Prior to the first use, the one-time code card is usually activated, ie the system requests the number and code from the specified, usually first, field. In case of using the card as the next one, the system usually asks for one of the unused codes from the currently active card and sometimes the code from the new one. Formerly the rule was to use the following card fields, there is currently a tendency to randomly select the code by the system. Only one disposable code card per system may be active, although the user may have several additional cards for later use.

The iTAN card (indexed TAN) is a variation of the one-time code, where the passwords are placed at the intersection of lines (eg letters) and columns (eg, numbers), randomly selected by the system, and the same password can be used repeatedly. . This type of card usually has a certain validity period, after which it is replaced by another.

Due to low price, one-time codes are much more popular than tokens.

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