Paging device including password accessed stored cryptographic keys

Claim 1

A paging device adapted to operate in a paging system which receives a message from a message source and which transmits said message to said paging-device, an improvement comprising the combination of: message receiving means in said paging device for receiving said transmitted message; memory storage means in said paging device for holding a plurality of pairs of associated values, each pair including a short password and a long cryptographic key, each short password being short relative to the associated long cryptographic key; manual entry means in said paging device for enabling manual entry and storage in said storage means of said pairs of short passwords and long cryptographic keys, each particular message received by said receiving means being encrypted in accordance with one of said long cryptographic keys, input means operable upon receipt of a particular message for obtaining from a user of said paging device said short password associated with the long cryptographic key used to encrypt said particular message; logic means for selecting the long cryptographic key associated with said short password; and transformation logic for applying said long cryptographic key to said message to transform said message to an alternate version of said message, and presenting said alternate version of said message for display.