We would like to cordially invite you to submit your original works to the Second International Workshop on Lightweight Cryptography for Security & Privacy workshop (LightSec 2013). LightSec 2013 will be held in TUSSIDE, Gebze in 6-7 May 2013. Please visit the workshop website for detailed information about LightSec 2013 : http://www.light-sec.org/2013/ The main goal of this workshop is to promote and initiate novel research on the cryptographic solutions to the security & privacy issues for applications that can be termed as lightweight security, due to the associated constraints on metrics such as available power, energy, computing ability, area, execution time, and memory requirements. It is likely that a post-conference proceedings volume will be published in Springer’s Lecture Notes in Computer Science. It will be announced on the workshop website as soon as it is finalized. Important Dates Deadline for Paper Submission: January 25, 2013 Notification of Acceptance: March 8, 2013 Workshop Date: May 6-7, 2013.