This Java code demonstrates the core steps of the JPEG compression algorithm. It implements the Discrete Cosine Transform (DCT), quantization, zigzag scan, and a simplified entropy encoding. These are fundamental processes for compressing digital images, reducing file size by transforming and encoding image data.
This example provides an educational look at the key stages of JPEG compression.
Continue reading Implementing JPEG Algorithm in JavaRun-Length Encoding (RLE) is a basic form of data compression where consecutive characters (runs) are replaced with a single character followed by the count of repetitions. This simple technique is useful for compressing repetitive data.
This Java program demonstrates how to apply RLE to a line of text input by the user.
Continue reading Implementing Run Length Encoding in JavaA transposition cipher is a method of encryption where the positions of characters are shifted according to a certain system, without changing the actual characters themselves. It rearranges the characters in a message to create ciphertext, and the same method in reverse restores the original message.
This post walks you through how a transposition cipher works using a Java program. This particular example arranges characters into a matrix and reads them column-wise (for encryption) or row-wise (for decryption).
This simple C++ implementation of a substitution cipher—specifically the Caesar cipher—demonstrates how basic cryptographic techniques can be used with file handling.
The Caesar cipher is one of the oldest and simplest substitution cipher techniques. It works by shifting the letters in a message by a fixed number of positions in the alphabet. Unlike transposition ciphers, which rearrange character positions, substitution ciphers replace characters with others based on a defined scheme.
This blog post demonstrates a C++ implementation that reads a message from a file, performs Caesar cipher encryption or decryption, and writes the result to another file.
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