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  2. /dev/random - Wikipedia

    en.wikipedia.org/wiki/Dev/random

    Non-random data is harmless, because only a privileged user can issue the ioctl needed to increase the entropy estimate. [ dubious – discuss ] The current amount of entropy and the size of the Linux kernel entropy pool, both measured in bits, are available in /proc/sys/kernel/random/ and can be displayed by the command cat /proc/sys/kernel ...

  3. List of file signatures - Wikipedia

    en.wikipedia.org/wiki/List_of_file_signatures

    AmiBack Amiga Backup data file 49 4E 44 58: INDX: 0 idx AmiBack Amiga Backup index file 62 70 6C 69 73 74: bplist: 0 plist Binary Property List file 42 5A 68: BZh: 0 bz2 Compressed file using Bzip2 algorithm 47 49 46 38 37 61 47 49 46 38 39 61: GIF87a GIF89a: 0 gif Image file encoded in the Graphics Interchange Format (GIF) [9] 49 49 2A 00 ...

  4. Entropy (computing) - Wikipedia

    en.wikipedia.org/wiki/Entropy_(computing)

    In computing, entropy is the randomness collected by an operating system or application for use in cryptography or other uses that require random data. This randomness is often collected from hardware sources (variance in fan noise or HDD), either pre-existing ones such as mouse movements or specially provided randomness generators.

  5. Hardware random number generator - Wikipedia

    en.wikipedia.org/wiki/Hardware_random_number...

    A USB-pluggable hardware true random number generator. In computing, a hardware random number generator (HRNG), true random number generator (TRNG), non-deterministic random bit generator (NRBG), [1] or physical random number generator [2] [3] is a device that generates random numbers from a physical process capable of producing entropy (in other words, the device always has access to a ...

  6. dd (Unix) - Wikipedia

    en.wikipedia.org/wiki/Dd_(Unix)

    dd is a command-line utility for Unix, Plan 9, Inferno, and Unix-like operating systems and beyond, the primary purpose of which is to convert and copy files. [1] On Unix, device drivers for hardware (such as hard disk drives) and special device files (such as /dev/zero and /dev/random) appear in the file system just like normal files; dd can also read and/or write from/to these files ...

  7. Apache Avro - Wikipedia

    en.wikipedia.org/wiki/Apache_Avro

    An Avro Object Container File consists of: [5] A file header, followed by; one or more file data blocks. A file header consists of: Four bytes, ASCII 'O', 'b', 'j', followed by the Avro version number which is 1 (0x01) (Binary values 0x4F 0x62 0x6A 0x01). File metadata, including the schema definition.

  8. File:9-demicube t0 D6.svg - Wikipedia

    en.wikipedia.org/wiki/File:9-demicube_t0_D6.svg

    Original file (SVG file, nominally 1,600 × 1,600 pixels, file size: 18 KB) This is a file from the Wikimedia Commons . Information from its description page there is shown below.

  9. x86 instruction listings - Wikipedia

    en.wikipedia.org/wiki/X86_instruction_listings

    Using a data size of 16 bits will cause only the bottom 16 bits of the 32-bit general-purpose registers to be modified – the top 16 bits are left unchanged.) The default OperandSize and AddressSize to use for each instruction is given by the D bit of the segment descriptor of the current code segment - D=0 makes both 16-bit, D=1 makes both 32 ...