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Security Testing and Evaluation Labs
Security Evaluation Laboratory (SEL)
IBM: Cryptographic Security Chip for PC Clients, Manufactured by Atmel (AT90SP0801)
The IBM Cryptographic Security Chip for PC Clients
Manufactured by Atmel (AT90SP0801) resides on a
daughter card on the system motherboard of an IBM
Personal Computer (PC) or is surface mounted in an
IBM ThinkPad. The IBM Cryptographic Security Chip
performs RSA digital signature, RSA data decryption,
and authentication. It is packaged in a 20 pin SOIC
package or a 28 pin TSSOP package and includes EEPROM
memory that can be loaded with RSA public/private
key pairs. Communication with the main processor is
via an SM bus. There are eleven simple commands
accepted by the chip. The IBM Cryptographic Security
Chip is used in a number of standard, off-the-shelf
IBM PC Client configurations. The chip and its
firmware and configuration are independent of the
characteristics of the host PC.
The IBM Cryptographic Security Chip performs RSA
signature and decryption. There are two types of key
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