Cryptography is the practice and study of techniques for secure communication and data protection in the presence of adversaries. It involves the use of mathematical algorithms and principles to transform plaintext (ordinary, readable data) into ciphertext (encrypted, unintelligible data) and vice versa. The primary objectives of cryptography are confidentiality, integrity, authentication, and non-repudiation. Operating systems […]

Protection in operating systems refers to the mechanisms put in place to control access to resources and prevent unauthorized manipulation of data. It encompasses features such as user authentication, access control lists, encryption, and privilege levels. On the other hand, Security involves the overall measures taken to defend against external threats, including malware, viruses, and

Disk scheduling algorithms are used by operating systems to determine the order in which disk I/O requests are serviced by the disk drive. These algorithms aim to minimize disk access time and maximize disk throughput by optimizing the movement of the disk’s read/write head. Several disk scheduling algorithms have been developed over the years, each

Disk management in an operating system involves various activities related to the management and organization of disk storage devices. These activities ensure efficient utilization of disk space, reliable storage of data, and optimal performance. Disk management in an operating system is a complex process that begins with partitioning, which divides the hard drive into several

CPU scheduling is the process by which the operating system selects the next process to be executed on the CPU. The objective is to achieve high throughput, low latency, and fair allocation of resources among competing processes. This involves managing various scheduling algorithms and policies tailored to meet specific system requirements and workload characteristics. In

Deadlock in operating systems occurs when two or more processes are unable to proceed with their execution because each is waiting for the other to release a resource, resulting in a circular wait situation. In other words, processes are stuck indefinitely, and none can make progress, leading to a system-wide halt. Example: Consider two processes:

Input/Output refers to the communication between a computer and the external world, enabling the exchange of data. It encompasses a wide array of devices, including keyboards, mice, displays, storage devices, and network interfaces. The OS acts as a mediator, managing the flow of information between the applications and the hardware, ensuring efficient and orderly data

In an operating system, a thread is the smallest unit of execution within a process. A process can have multiple threads, and each thread shares the same resources, such as memory space and open files, with other threads in the same process. Threads within a process can execute concurrently, providing a way to achieve parallelism

Interrupts are signals or events that divert the attention of the central processing unit (CPU) from its current task to handle a specific event. These events can range from hardware-related issues, such as a keypress or mouse movement, to software-generated signals like system calls or program errors. Interrupts allow the operating system to promptly respond

A File system is responsible for organizing data into files and directories, allowing users and applications to locate, access, and manipulate information efficiently. It acts as a bridge between the user and the physical storage media, providing a logical structure for data storage. In the below PDF we discuss about File System  in detail in simple