US Patent 8713672 Method and apparatus for token-based context caching

According to one embodiment, an apparatus may receive a token that indicates a change that occurs during a session. The session may facilitate access to a resource. The token may indicate a risk token should be computed. The apparatus may determine, from the token, a first set of attributes. The first set of attributes may include attributes required to compute the risk token. The apparatus may determine that a cache contains a set of cached attributes. The apparatus may examine an attribute in the set of cached attributes, and determine the attribute in the set of cached attributes is not in the first set of attributes. The apparatus may then remove the attribute in the set of cached attributes from the cache.