A Highly Efficient Correlation Power Analysis on PRINT Cipher

PRINT cipher is a lightweight block ciphers dedicated to integrated circuit (IC) printing, proposed by Lars Knudsen et al. at CHES 2010. Interestingly, PRINT cipher discards the key schedule part and keeps all its round keys identical. This unconventional design guarantees its modest space requirement. In this paper, however, we will show how to make use of its identical round key to mount a terrifically efficient DPA attack on PRINT cipher. On an round-based implementation of PRINTcipher-48, our attack is able to retrieve the complete secret key with merely 32 traces.