Security

Cryptanalysis of the Atmel Cipher in SecureMemory, CryptoMemory and CryptoRF

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Executive Summary

SecureMemory (SM), CryptoMemory (CM) and CryptoRF (CR) are the Atmel chip families with wide applications in practice. They implement a proprietary stream cipher, which the authors call the Atmel cipher, to provide authenticity, confidentiality and integrity. The Atmel chips AT88SC153 and AT88SC1608, called SecureMemory (SM) family, were introduced in 1999. The CryptoMemory (CM) family including the AT88SCxxxxC chips was introduced in early 2002 with more advanced cryptographic features. These two families are ISO/IEC 7816 smart cards that communicate through a contact interface; in late 2003, the CryptoRF (CR) family (ISO/IEC 14443-B smart cards), which is a variant of the CM family with the AT88SCxxxxCRF chips was introduced with a RF interface.

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