The name that the system knows you as. For example, "jdoe".
A password, usually selected by the user, that is needed to gain access to the system. For example, "SEc1_rt".
A packet of information output by a system when it wishes to authenticate a user. In OPIE, this is a three-item group consisting of a hash identifier, a sequence number, and a seed. This information is needed by the OPIE calculator to generate a proper response. For example, "otp-md5 95 wi14321".
A packet of information generated from a challenge that is used by a system to authenticate a user. In OPIE, this is a group of six words that is generated by the calculator given the challenge and the secret password. For example, "PUP SOFT ROSE BIAS FLAG END".
A piece of information that is used in conjunction with the secret password and sequence number to compute the response. Its purpose is to allow the same secret password to be used for multiple sequences, by changing the seed, or for authentication to multiple machines by using different seeds.
A counter used to keep track of key iterations. In OPIE, each time a successful response is received by the system, the sequence number is decremented. For example, "95".
A piece of text that identifies the actual algorithm that needs to be used to generate a proper response. In OPIE, the only two valid hash identifiers are "otp-md4", which selects MD4 hashing, and "otp-md5", which selects MD5.