A Sindhu*
Lightweight cryptography has been an important area of cryptographic research in recent years. In this project, a high throughput and flexible hardware implementations of the SPECK light weight block cipher is presented. In the SPECK block cipher, to reduce critical path delay, a tree structure for implementation of Sklansky adder which is an efficient parallel prefix adder operation is used. Simon cipher supports the variable key sizes (128, 144,192, and 256) bits and block sizes (64, 96, and 128) bits is also implemented by using the parallel prefix adder structure reduce the critical path delay.
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