Internship - ARIA

Subject

ARIA implementation in C: the intern will have to propose a C implementation of the ARIA algorithm. The internship will be performed as part of the Security Architects for the Crypto-Library Team. Depending on the profile of the applicant, the way forward will either focus on optimization / protection of the implementation / comparison with other languages.

What is ARIA? Aria is a Korean block-cipher algorithm. The algorithm uses a substitution–permutation network structure based on AES. The interface is the same as AES: 128-bit block size with key size of 128, 192, or 256 bits. The number of rounds is 12, 14, or 16, depending on the key size. ARIA uses two 8×8-bit S-boxes and their inverses in alternate rounds; one of these is the Rijndael S-box.

The key schedule processes the key using a 3-round 256-bit Feistel cipher, with the binary expansion of 1/π as a source of "nothing up my sleeve numbers".

Tasks

Required

• Read and understand ARIA specifications and present a summary of it.
• Write a proof of concept (POC) in C.
• Integrate this POC in our framework.

Optional way to continue from this point:

• Adding protection against attacks
• Optimize implementation.

Practical details

The internship will take place in Toulouse, in NXP premises (134 Avenue du Général Eisenhower, 31100 Toulouse). Reach out to baudouin.duthoit_1@nxp.com if interested.

Required skills

Mandatory skills

• Block Cipher knowledge
• C language proficiency
• Fluent English

Optional skills

• Side-Channel Attacks knowledge – for protection against such attacks
• Fault Attack knowledge – for protection against such attacks
• Assembly (ARM, RISC V) – for implementation comparison
• Rust – for implementation comparison

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