Second factor based realm selection for federated authentications

A computer program product for authentication of a username, the computer program product comprising:

• one or more computer readable storage media, and program instructions collectively stored on the one or more computer readable storage media, the program instructions comprising:
• program instructions to maintain a mapping of usernames and realms;
• program instructions to receive a username and a time-based one-time password code (TOTP code) for said username based on an authentication application;
• program instructions to upon receiving said TOTP code:
• determine a realm from said mapping based on said received username and said received TOTP;
• and
• request an entry of a credential relating to said username in said realm;
• and
• program instructions to, upon receiving of said requested credential, authenticate said username by determining that said received credential matches an expected credential for said realm.

A computer system for authentication of a username, the computer system comprising:

• one or more computer processors, one or more computer readable storage media, and program instructions collectively stored on the one or more computer readable storage media for execution by at least one of the one or more computer processors, the program instructions comprising:
• program instructions to maintain a mapping of usernames and realms;
• program instructions to receive a username and a time-based one-time password code (TOTP code) for said username based on an authentication application;
• program instructions to upon receiving said TOTP code:
• determine a realm from said mapping based on said received username and said received TOTP;
• and
• request an entry of a credential relating to said username in said realm;
• and
• program instructions to, upon receiving of said requested credential, authenticate said username by determining that said received credential matches an expected credential for said realm.