Data processing apparatus having a real memory region with a cor

Details Data processing apparatus having a real memory region with a cor Data processing apparatus having a real memory region with a cor

1991-08-29

1994-08-02

Dixon, Joseph L.

Cryptography

Key management

Having particular key generator

380 4, 364DIG2, 3649475, 235382, 235431, G06F 1206, G06F 1214

Patent

active

053353340

ABSTRACT:
A region comprising a plurality of real pages in a part of a real storage unit is provided with a first key storage unit having a plurality of key storage entries each corresponding to one of the plurality of real pages, while a second region comprising a plurality of real pages in the second part of the real storage unit is provided with a second key storage unit having a single key storage entry. When a real address designated by an instruction to be executed belongs to the first region, an entry corresponding to this address is accessed by a storage protection control circuit. When this address belongs to the second region, the second key storage unit is accessed irrespective of the address. Further, a key within the accessed key information is compared with a key on a program status word (PSW) allocated to a program to determine whether the execution of the instruction is permitted.

REFERENCES:
patent: 4589064 (1986-05-01), Chiba et al.
patent: 4658356 (1987-04-01), Shiozaki et al.
patent: 4849927 (1989-07-01), Vos
patent: 4868736 (1989-09-01), Walker
patent: 4954982 (1990-09-01), Tateishi et al.
patent: 5163096 (1992-11-01), Clark et al.

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