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A transaction authentication number (TAN) is used by some online banking services as a form of single use one-time passwords (OTPs) to authorize financial transactions. TANs are a second layer of security above and beyond the traditional single-password authentication .
However, where the application is online, the acknowledgment (a PDF file) which is generated after filling up the form must be forwarded to NSDL. Detailed guidelines for the procedure are available at NSDL website. A TAN application should accompany a 'proof of identity' and a 'proof of address' (photocopies) of the deductor.
Static password token The device contains a password that is physically hidden (not visible to the possessor), but is transmitted for each authentication. This type is vulnerable to replay attacks. Synchronous dynamic password token A timer is used to rotate through various combinations produced by a cryptographic algorithm. The token and the ...
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MasterCard SecureCode uses OTAC to confirm a user's identity One time authorization code as used in Yammer's desktop client. A one-time password (OTP), also known as a one-time PIN, one-time passcode, one-time authorization code (OTAC) or dynamic password, is a password that is valid for only one login session or transaction, on a computer system or other digital device.
A format of one-time pad used by the U.S. National Security Agency, code named DIANA.The table on the right is an aid for converting between plaintext and ciphertext using the characters at left as the key.
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