CSSASBU
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CafeCS
PublicCafé CS is a weekly webinar series organized by the Scientific Association of Computer Science at Shahid Beheshti University. Each one-hour session features talks by computer enthusiasts, students, and professionals who share insights on diverse computer science topics—from foundational concepts to emerging technologies.CSSASBU
PublicPardazeh-18-0-Enigma
PublicPardazeh-18-8-ASCIIShift
PublicASCII (American Standard Code for Information Interchange) is a character encoding standard that represents text in computers using numeric codes. It assigns a unique number (ranging from 0 to 127) to each character, such as letters, digits, and symbols. For example, the letter "A" is represented by the number 65 in ASCII.Pardazeh-18-7-hex2ASCII
PublicHexadecimal is a number system based on 16 digits, using the numbers 0-9 and the letters A-F. Each digit represents a value from 0 to 15. It is commonly used in computing because it's more compact than binary and easier for humans to read, often representing data like colors, memory addresses, or machine code. For example, "A3" is equal to 163.- Alternate Data Streams (ADS) in NTFS allow multiple data streams to be associated with a single file. In addition to the main data stream, files can store extra data under different names. This feature is often used for metadata but can also be exploited to hide information or malware within a file.
Pardazeh-18-5-226
Public- Visual cryptography is a unique encryption technique where a secret image is divided into multiple transparent shares. Individually, these shares appear as random patterns and reveal nothing about the original image. However, when stacked together, they reconstruct the hidden image without requiring any computational tools.
Pardazeh-18-3-Stego
PublicImage steganography is the technique of embedding concealed information within digital images, typically by modifying less noticeable components, such as the least significant bits of pixel values. This ensures the image retains its original appearance while securely encoding hidden data.Pardazeh-18-2-SSC
PublicA simple substitution cipher is an encryption method where each letter in the plaintext is consistently replaced with a different letter. For example, if ‘A’ becomes ‘D’, all 'A’s in the message will be encoded as 'D’s. While easy to use, it can be cracked through frequency analysis, making it a popular puzzle in cryptography.Pardazeh-18-1-NewCaesar
PublicThe Caesar Cipher is one of the simplest encryption techniques. It's a type of substitution cipher where each letter in the plaintext is shifted a certain number of places down or up the alphabet.