Blowfish has a 64-bit block size and a variable key length from 32 bits up to 448 bits.

For example, 64-bit block ciphers like DES can be used to generate a keystream in output feedback ( OFB ) mode.

CAST-128 is a 12-or 16-round Feistel network with a 64-bit block size and a key size of between 40 to 128 bits ( but only in 8-bit increments ).

In UFS2, Kirk McKusick and Poul-Henning Kamp extended the FreeBSD FFS and UFS layers to add 64-bit block pointers ( allowing volumes to grow up to 8 zettabytes ), variable-sized blocks ( similar to extents ), extended flag fields, additional ' birthtime ' stamps, extended attribute support and POSIX1. e ACLs.

SMB2 uses 32 or 64-bit wide storage fields, and 128 bits in the case of file-handles, thereby removing previous constraints on block sizes, which improves performance with large file transfers over fast networks.

Another variant, described in ( US Patent 3, 796, 830 ; Nov 1971 ), uses a 64-bit key operating on a 32-bit block, using one addition mod 4 and a singular 4-bit S-box.

The 64-bit data block is considered as a series of eight 8-bit bytes, and if the ICB corresponding to a particular byte is zero, the left and right 4-bit halves ( nibbles ) are swapped.

GOST has a 64-bit block size and a key length of 256 bits.

TEA operates on two 32-bit unsigned integers ( could be derived from a 64-bit data block ) and uses a 128-bit key.

Like TEA, XTEA is a 64-bit block Feistel network with a 128-bit key and a suggested 64 rounds.

Little is publicly known about Red Pike, except that it is a block cipher with a 64-bit block size and 64-bit key length.

:: 64-bit block ciphers

:: 64-bit block ciphers

: 64-bit block ciphers ( 128 bit block ciphers are preferable if possible )

There have been several different revisions of FEAL, though all are Feistel ciphers, and make use of the same basic round function and operate on a 64-bit block.

KASUMI is a block cipher with 128-bit key and 64-bit input and output.

CAST-256 uses the same elements as CAST-128, including S-boxes, but is adapted for a block size of 128 bits — twice the size of its 64-bit predecessor.

The design is classed as a " legacy-level " algorithm, with a 64-bit block size ( in common with older ciphers such as DES and IDEA ) and a 128-bit key.

SHARK has a 64-bit block size and a 128-bit key size.

The first SAFER cipher was SAFER K-64, published by Massey in 1993, with a 64-bit block size.

The encryption is fairly weak, using a 35-bit initialization vector and encrypting the voice stream with 64-bit encryption.

Alpha, originally known as Alpha AXP, is a 64-bit reduced instruction set computer ( RISC ) instruction set architecture ( ISA ) developed by Digital Equipment Corporation ( DEC ), designed to replace the 32-bit VAX complex instruction set computer ( CISC ) ISA and its implementations.

The Alpha was designed as 64-bit from the start and there is no 32-bit version.

The program counter is a 64-bit register which contains a longword-aligned virtual byte address, that is, the low two bits of the program counter are always zero.

The floating-point control register ( FPCR ) is a 64-bit register defined by the architecture intended for use by Alpha implementations with IEEE 754-compliant floating-point hardware.

On a typical computer system, a ' double precision ' ( 64-bit ) binary floating-point number has a coefficient of 53 bits ( one of which is implied ), an exponent of 11 bits, and one sign bit.

* Windows XP 64-bit Edition, is a version for Intel's Itanium line of processors ; maintains 32-bit compatibility solely through a software emulator.

It is designed to use the expanded 64-bit memory address space provided by the x86-64 architecture.

Windows XP Professional x64 Edition is not to be confused with Windows XP 64-bit Edition, as the latter was designed for Intel Itanium processors.

The biggest advantage of the 64-bit version is breaking the 4 gigabyte memory barrier, which 32-bit computers cannot fully access.

The state variable S may be a 32-or 64-bit unsigned integer ; in that case, S0 can be 0, and G ( S, n ) can be just S mod n. The best choice of F is a complex issue and depends on the nature of the data.

Itanium ( ) is a family of 64-bit Intel microprocessors that implement the Intel Itanium architecture ( formerly called IA-64 ).

Several optional extensions are also available, including MIPS-3D which is a simple set of floating-point SIMD instructions dedicated to common 3D tasks, MDMX ( MaDMaX ) which is a more extensive integer SIMD instruction set using the 64-bit floating-point registers, MIPS16e which adds compression to the instruction stream to make programs take up less room, and MIPS MT, which adds multithreading capability.

The MIPS64 architecture is a high performance 64-bit instruction set architecture that is widely used in networking infrastructure equipment through MIPS licensees such as Cavium Networks and NetLogic Microsystems.

< tt > MMIX </ tt > ( pronounced em-mix ) is a 64-bit RISC architecture designed by Donald Knuth, with significant contributions by John L. Hennessy ( who contributed to the design of the MIPS architecture ) and Richard L. Sites ( who was an architect of the Alpha architecture ).

< tt > MMIX </ tt > is a 64-bit RISC computer, with 256 64-bit general-purpose registers and 32 64-bit special-purpose registers.

< tt > MMIX </ tt > is a big-endian machine with 32-bit instructions and a 64-bit virtual address space.

* MKS Toolkit, originally created for MS-DOS, is a software package produced and maintained by MKS Inc. that provides a Unix-like environment for scripting, connectivity and porting Unix and Linux software to both 32-and 64-bit Microsoft Windows systems.

Although most x86 processors used in new personal computers and servers have 64-bit capabilities, to avoid compatibility problems with older computers or systems, the term x86-64 ( or x64 ) is often used to denote 64-bit software, with the term x86 implying only 32-bit.

AMD chose a different direction, designing the less radical x86-64, a 64-bit extension to the existing x86 architecture, which Microsoft then supported, forcing Intel to introduce the same extension in its own x86-based processors.

The most common cases refer to how bytes are ordered within a single 16 -, 32 -, or 64-bit word, and endianness is then the same as byte order .< ref > For hardware, the Jargon File also reports the less common expression byte sex.

Later, he worked on targeting Windows NT to Digital's 64-bit Alpha architecture ( itself based on the Prism design ), then on Windows 2000.

To address technical workstation, supercomputer, and engineering / scientific markets, IBM Austin ( the home of the RS / 6000s ) then started developing a time-to-market single-chip version of the Power2 ( P2SC ) in parallel with the development of a sophisticated 64-bit PowerPC processor with the POWER2 extensions and twin sophisticated MAF floating point units ( the POWER3 / 630 ).

It was first employed in Windows XP 64-bit Edition ( for the Itanium ), but then reused for the “ x64 Editions ” of Windows XP and Windows Server 2003.

Although originally limited to 32-bit addressing ( and therefore about 4 GB drives ), FFS belatedly got some third-party 64-bit patches and then real ( but non-Commodore ) updates to allow it to circumvent these limitations.

Memory is normally organized within the RAM chips in a row / column format, with a controller on the chip reading requested data from the chip in parallel across the rows, then assembling the results into 32-or 64-bit words for processing by the CPU.

For instance, an application might ask the kernel for the " file system " and be handed a 32-bit key representing a program id, and then use that key to send a message to the file system asking it to open the file " my addresses ", which would result in a 64-bit key being handed back.