PRESENT Locks in Security

Wednesday, February 22, 2012 @ 02:02 PM gHale

An increasing number of everyday devices such as car keys, smart phones and even medical implants need protection from hackers.

Right now the encryption method PRESENT is the smallest, or one of the smallest, cipher for such cost and energy constrained applications.

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PRESENT is a lightweight block cipher designed for hardware constrained applications such as RFID tags and Smart Cards. This cipher is an example of SPN ciphers. The block size is 64 bits, key size can be either 80 or 128 bits and the number of rounds is 31. The S-Box used in PRESENT is a 4-bit to 4-bit S-Box which invokes both in the substitution layer and in the key scheduling routine. This project entails an encryption-only implementation of PRESENT cipher with key size equal to 80 bits.

PRESENT is the result of a collaboration between the Ruhr-Universität Bochum (Germany), Orange Labs France and the Technical University of Denmark.

Because the cipher combines low costs with a particularly high level of security it is becoming an international standard now. The International Organization for Standardization (ISO) adopted the cipher as a standard ISO/IEC 29192.

“For several years there has been a growing demand by industry for building blocks, which aren’t only offering excellent security, but are cost efficient. PRESENT is the first cipher which was developed especially for this purpose. It provides security at costs of less than one cent”, said Prof. Christof Paar (Chair for Embedded Security).

PRESENT, which won the German IT-Security Award in 2010, will see use in logistics, in vehicles and machines and in medical technologies within the next years.

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