1. Implemented the encoder and decoder of common 2D barcodes by C programming, including Aztec Code, PDF417 Code, Data Matrix Code, Maxi Code and Chinese Information Code.2. Designed and Finished a new PDF417 barcode image decoding algorithm that obviously enhances the decoding performance of barcode scanners.

1. Analyzed the principles of Random Number Generators, including Intel RNG and Linux RNG.2. Analyzed different aspects of cryptography, including Classical Ciphers (Substitution Ciphers and Transposition Ciphers), Symmetric-Key Algorithms (AES Algorithm), Public-Key Cryptography (Knapsack Problem and RSA Algorithm) and Message Authentication Code (Hash Function).