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Method for decrypting German Enigma ciphers
In cryptography, the clock was a method devised by Polish mathematician-cryptologist Jerzy Różycki, at the Polish General Staff's Cipher Bureau, to facilitate
Clock_(cryptography)
Where a clock does not run at same rate as reference clock
need high quality random numbers, especially for cryptography. There are several similar ways clock drift can be used to build random number generators
Clock_drift
Topics referred to by the same term
operation. Clock (cryptography), a method to facilitate decrypting German Enigma ciphers Clock (Apple), a bundled iPhone app Windows Clock, a bundled
Clock_(disambiguation)
Single-use value in secure communications
In cryptography, a nonce is an arbitrary number that can be used just once in a cryptographic communication. It is often a random or pseudo-random number
Cryptographic_nonce
Algorithm
Symmetric-key algorithms are algorithms for cryptography that use the same cryptographic keys for both the encryption of plaintext and the decryption of
Symmetric-key_algorithm
Clifford Cocks • Clipper chip • Clock (cryptography) • Clock drift • CMVP • COCONUT98 • Codebook • Code (cryptography) • Code talker • Codress message
Index of cryptography articles
Index_of_cryptography_articles
Networking protocol for clock synchronization
attack can be used to alter clocks on client computers and allow a number of attacks based on bypassing of cryptographic key expiration. Some of the services
Network_Time_Protocol
Computer authentication protocol
Kerberos builds on symmetric-key cryptography and requires a trusted third party, and optionally may use public-key cryptography during certain phases of authentication
Kerberos_(protocol)
Set of cryptographic hash functions
SHA-2 (Secure Hash Algorithm 2) is a set of cryptographic hash functions designed by the United States National Security Agency (NSA) and first published
SHA-2
Software that uses cryptography
Encryption software is software that uses cryptography to prevent unauthorized access to digital information. Cryptography is used to protect digital information
Encryption_software
German cipher machine during World War II
letter is encrypted with a different cryptographic key, making it highly resistant to conventional cryptographic attacks based on patterns the keys leave
Enigma_machine
Type of authentication protocol
impractical to implement a true nonce, a strong cryptographically secure pseudorandom number generator and cryptographic hash function can generate challenges that
Challenge–response authentication
Challenge–response_authentication
Cryptographic attack
In cryptography, a timing attack is a side-channel attack in which the attacker attempts to compromise a cryptosystem by analyzing the time taken to execute
Timing_attack
Subfield of computer science and mathematics
computation, quantum computation, automata theory, information theory, cryptography, program semantics and verification, algorithmic game theory, machine
Theoretical_computer_science
Polish decryption device
procedure, which seemed reasonably secure to the Germans, was nonetheless a cryptographic malpractice, since the first insights into Enigma encryption could be
Bomba_(cryptography)
Stream cipher
"Conditional Estimators: An Effective Attack on A5/1". Selected Areas in Cryptography 2005: 1–19. Barkan, Elad; Eli Biham; Nathan Keller (2003). "Instant Ciphertext-Only
A5/1
Type of symmetric key cipher
seed value using digital shift registers. The seed value serves as the cryptographic key for decrypting the ciphertext stream. Stream ciphers represent a
Stream_cipher
British designation for intelligence from decrypted enemy communications
chief engineer Harold Keen. After the war, interrogation of German cryptographic personnel led to the conclusion that German cryptanalysts understood
Ultra_(cryptography)
Standard for the encryption of electronic data
Agency (NSA) for top secret information when used in an NSA approved cryptographic module. The Advanced Encryption Standard (AES) is defined in these standards:
Advanced_Encryption_Standard
Function that derives secret keys from a secret value
In cryptography, a key derivation function (KDF) is a cryptographic algorithm that derives one or more secret keys from a secret value such as a master
Key_derivation_function
Computation modulo a fixed integer
familiar setting exhibiting modular arithmetic is the hour hand on a 12-hour clock. If the hour hand points to 7 now, then 8 hours later it will point to 3
Modular_arithmetic
Type of substitution cipher
letters can be assigned to the grid. The Pigpen cipher offers little cryptographic security. It differentiates itself from other simple monoalphabetic
Pigpen_cipher
Earliest civilian block ciphers
In cryptography, Lucifer was the name given to several of the earliest civilian block ciphers, developed by Horst Feistel and his colleagues at IBM. Lucifer
Lucifer_(cipher)
Piece of multi-factor authentication
primary architectures for software tokens: shared secret and public-key cryptography. For a shared secret, an administrator will typically generate a configuration
Software_token
Family of elliptic curves used in cryptography
finite fields is widely used in elliptic curve cryptography. Applications of Edwards curves to cryptography were developed by Daniel J. Bernstein and Tanja
Edwards_curve
2012 64-bit mainframe microprocessor by IBM
of order execution and one dedicated co-processor for compression and cryptography. The instruction pipeline has 15 to 17 stages; the instruction queue
IBM_zEC12
Any attack based on information gained from the implementation of a computer system
information. These attacks differ from those targeting flaws in the design of cryptographic protocols or algorithms (notwithstanding the fact that cryptanalysis
Side-channel_attack
Stream cipher algorithm
In cryptography, DICING is a stream cypher algorithm developed by Li An-Ping. It has been submitted to the eSTREAM project of the eCRYPT network. DICING
DICING
Form of pseudorandom number generator
In cryptography, an alternating step generator (ASG) is a cryptographic pseudorandom number generator used in stream ciphers, based on three linear-feedback
Alternating_step_generator
Techniques to protect against brute-force attack
In cryptography, key stretching techniques are used to make a possibly weak key, typically a password or passphrase, more secure against a brute-force
Key_stretching
Side-channel attack in cryptography
In cryptography, electromagnetic attacks are side-channel attacks performed by measuring the electromagnetic radiation emitted from a device and performing
Electromagnetic_attack
Block cipher
In cryptography, Twofish is a symmetric key block cipher with a block size of 128 bits and key sizes up to 256 bits. It was one of the five finalists of
Twofish
Transient-key cryptography is a form of public-key cryptography wherein keypairs are generated and assigned to brief intervals of time instead of to individuals
Transient-key_cryptography
128-bit number used to identify information in computer systems
13-bit or 14-bit "uniquifying" clock sequence extends the timestamp in order to handle cases where the processor clock does not advance fast enough, or
Universally_unique_identifier
English physicist and inventor (1802–1875)
electro-magnetic clock in the library of the Royal Society, and propounded a plan for distributing the correct time from a standard clock to a number of
Charles_Wheatstone
Topics referred to by the same term
Pinwheel may refer to: Pinwheel (toy), a spinning children's toy Pinwheel (cryptography), a device for producing a short pseudo-random sequence of bits Pinwheel
Pinwheel
Password that can only be used once
pseudorandomness or randomness to generate a shared key or seed, and cryptographic hash functions, which can be used to derive a value but are hard to
One-time_password
problems in the areas of Bioinformatics, Biomedical engineering and cryptography. It is an open source project licensed under the GPL. List of volunteer
Java Heterogeneous Distributed Computing
Java_Heterogeneous_Distributed_Computing
Algorithm used to generate cryptographic keys
A key generator (or keygen) in cryptography is a protocol or algorithm used to generate a sequence with pseudo-random characteristics for use as an encryption
Key_generator
Secure communication method
distribution (QKD) is a secure communication method that implements a cryptographic protocol based on the laws of quantum mechanics, specifically quantum
Quantum_key_distribution
Engineering discipline specializing in the design of computer hardware
used to implement the logic. Computer engineers work in coding, applied cryptography, and information protection to develop new methods for protecting various
Computer_engineering
Application for storing and managing passwords
Password Safe was released as a free utility, due to export restrictions on cryptography from the United States, only U.S. and Canadian citizens and permanent
Password_manager
Computer instruction for returning hardware-generated random numbers
with security and cryptographic standards such as NIST SP 800-90A, FIPS 140-2, and ANSI X9.82. After a request from Intel, Cryptography Research Inc. released
RDRAND
Topics referred to by the same term
military use, a superiority in elevation over an opposing force Advantage (cryptography), a measure of the effectiveness of an enemy's code-breaking effort Advantage
Advantage
Data proving ownership of a public key
In cryptography, a public-key certificate, also known as a digital certificate or identity certificate, is an electronic document used to prove the valid
Public_key_certificate
Central computer component that executes instructions
Cray-1, were associated almost exclusively with scientific research and cryptography applications. However, as multimedia has largely shifted to digital media
Central_processing_unit
Form of side channel attack
channel attack in which the attacker studies the power consumption of a cryptographic hardware device. These attacks rely on basic physical properties of
Power_analysis
Device used to gain access to restricted resource
without the use of a clock, either from a one-time pad or cryptographic algorithm. Challenge–response token Using public key cryptography, it is possible to
Security_token
Information held in the state of a quantum system
quantum mechanics, computer science, information theory, philosophy and cryptography among other fields. Its study is also relevant to disciplines such as
Quantum_information
Network attack in which valid data transmission is repeated or delayed
the time on his clock together with a MAC. When Alice wants to send Bob a message, she includes her best estimate of the time on his clock in her message
Replay_attack
Microprocessor core model by ARM
one cycle longer compared to the A77, which ensures that the A78 hits a clock frequency target of around 3 GHz. The A78 is a 6 instruction per cycle design
ARM_Cortex-A78
Theories, models and concepts that go back to the quantum hypothesis of Max Planck
quantum cryptography, which will theoretically allow guaranteed secure transmission of information. An inherent advantage yielded by quantum cryptography when
Applications of quantum mechanics
Applications_of_quantum_mechanics
Microprocessor core model
Cortex-A77 added a second AES unit in order to improve the throughput of cryptography operations. Larger ROB, Up to 160-entry, up from 128, Add New L0 MOP
ARM_Cortex-A77
Cipher machines used by the German Army during World War II
mathematician Bill Tutte. He applied a technique that he had been taught in his cryptographic training, of writing out the key by hand and looking for repetitions
Lorenz_cipher
Array of logic gates that are reprogrammable
used for clock generation and management as well as for high-speed serializer and deserializer (SERDES) transmit clocks and receiver clock recovery.
Field-programmable_gate_array
Stream cipher
(mod\ 2^{32})\\[]c_{i}=c_{i-58}+c_{i-19}\ (mod\ 2^{32})\end{aligned}}} The clock control is based on the carry bits. If all carry bits agree we step all
Pike_(cipher)
application TLS 1.3 compliance table". Required components for NSA Suite B Cryptography (RFC 6460) are: Advanced Encryption Standard (AES) with key sizes of
Comparison of TLS implementations
Comparison_of_TLS_implementations
CPU released in 2018
A64, A32, T32 Extensions ARMv8.1-A, ARMv8.2-A, ARMv8.3-A, ARMv8.4-A, Cryptography, RAS Products, models, variants Product code name Enyo Variant Arm Neoverse
ARM_Cortex-A76
Cryptographic device
sequence of numbers are crucial to the success of the implementation: in cryptography and gambling machines. The major use for hardware random number generators
Hardware random number generator
Hardware_random_number_generator
Cryptanalytic attacks using a system of multivariate equations
cryptanalysis by which a set of algebraic equations can be used to solve a cryptographic Boolean function that has a low degree or a high degree of non linearity
Algebraic_attack
invented by Charles James Mason (1791–1856). Anglo-Saxon times: type of candle clock invented by Alfred the Great (849–899). c. 1657: Anchor escapement probably
List of English inventions and discoveries
List_of_English_inventions_and_discoveries
2025 mobile operating system
successfully. TLS 1.3 in iOS 26 uses a key exchange based on quantum-secure cryptography, and it is enabled by default since it has already been adopted by the
IOS_26
2014 film by Morten Tyldum
boarding school, befriends Christopher Morcom, who sparks his interest in cryptography. Turing develops romantic feelings, but Christopher dies of bovine tuberculosis
The_Imitation_Game
Set of cryptographic hash functions
MD5-like structure of SHA-1 and SHA-2. SHA-3 is a subset of the broader cryptographic primitive family Keccak (/ˈkɛtʃæk/ or /ˈkɛtʃɑːk/), designed by Guido
SHA-3
Computing concept
randomness collected by an operating system or application for use in cryptography or other uses that require random data. This randomness is often collected
Entropy_(computing)
Central processing unit designed by Centaur Technology and sold by VIA Technologies
"Montgomery multiplier" supporting key sizes up to 32K for public-key cryptography. C7 Esther as an evolutionary step after C3 Nehemiah, in which VIA /
VIA_C7
ARM Cortex-M based Microcontrollers by STMicroelectronics
Ethernet MAC, camera interface, USB 2.0 OTG FS. The STM32F21x models add a cryptographic processor for DES / TDES / AES, and a hash processor for SHA-1 and MD5
STM32
Measurement standards laboratory in the United States
in it...The National Security Agency (NSA) participates in the NIST cryptography process because of its recognized expertise. NIST is also required by
National Institute of Standards and Technology
National_Institute_of_Standards_and_Technology
ARM- and RISC-V-architecture microcontroller by the Raspberry Pi Foundation
code in boot ROM allows for checking blocks in the flash memory for cryptographic signatures using a public key stored in the OTP memory. It also includes
RP2350
Family of x86 central processing units for personal computers
2018-10-15. "Evaluation of VIA C3 "Nehemiah" Random Number Generator" (PDF). Cryptography Research, Inc. Archived from the original (PDF) on 2006-12-31. Retrieved
VIA_C3
Class of attack on cryptographic systems
The security of cryptographic systems depends on some secret data that is known to authorized persons but unknown and unpredictable to others. To achieve
Random number generator attack
Random_number_generator_attack
Stream cipher
products with cryptographic security features". The cipher is based on a combination of four linear-feedback shift registers with irregular clocking and a non-linear
A5/2
Encrypted sculpture by American artist Jim Sanborn
with a retiring CIA employee named Edward Scheidt to come up with the cryptographic systems used on the sculpture. Edward Scheidt stated that the difficulty
Kryptos
Suite of IETF specifications
System (DNS) in Internet Protocol (IP) networks. The protocol provides cryptographic authentication of data, authenticated denial of existence, and data
Domain Name System Security Extensions
Domain_Name_System_Security_Extensions
Graphics chip used in the Nintendo Wii
internal flash storage. Starlet also manages security functions, including cryptography, ensuring the console remains secure even if the main Broadway processor
Hollywood_(graphics_chip)
Line of mainframe computers
instruction set as the z10 EC but with higher manufacturing yields (3.5 GHz clock speed, one core per chip disabled) and lower cost processor packaging due
IBM_System_z10
Family of stream ciphers
variable sizes and instant re-keying. All VEST ciphers release output on every clock cycle. All the VEST variants are covered by European Patent Number EP 1820295(B1)
VEST
Windows database that stores users' passwords
Windows 2000 SP4, Active Directory authenticates remote users. SAM uses cryptographic measures to prevent unauthenticated users accessing the system. The
Security_Account_Manager
Instructions for the x86 microprocessors
AVX is not sufficient) Cryptography BSAFE C toolkits uses AVX and AVX2 where appropriate to accelerate various cryptographic algorithms. OpenSSL uses
Advanced_Vector_Extensions
Local computer bus for attaching hardware devices
processor's address space. It is a parallel bus, synchronous to a single bus clock. Attached devices can take either the form of an integrated circuit fitted
Peripheral Component Interconnect
Peripheral_Component_Interconnect
2022 operating system version
for JavaScript in Safari. Built-in apps cannot be moved from the cryptographically verified Signed System Volume to another location where they could
MacOS_Ventura
Stream cipher
In cryptography, Mutual Irregular Clocking KEYstream generator (MICKEY) is a stream cipher algorithm developed by Steve Babbage and Matthew Dodd. The
MICKEY
American annual computer science prize
Retrieved March 4, 2024. Diffie, W.; Hellman, M. (1976). "New directions in cryptography" (PDF). IEEE Transactions on Information Theory. 22 (6): 644–654. Bibcode:1976ITIT
Turing_Award
Physics phenomenon
down-conversion to develop entanglement swapping and demonstrate quantum cryptography with entangled photons. In 2022, the Nobel Prize in Physics was awarded
Quantum_entanglement
Overview of and topical guide to algorithms
science, mathematics, operations research, artificial intelligence, cryptography, data compression, computer graphics, bioinformatics, and many other
Outline_of_algorithms
2010 64-bit mainframe microprocessor by IBM
There's also an additional shared L1 cache used for compression and cryptography operations. Each core has six RISC-like execution units, including two
IBM_z196
Computer science topic
necessary to retain all the existing bits, and is frequently used in digital cryptography.[clarification needed] Rotate through carry is a variant of the rotate
Bitwise_operation
of the NPL design. Diffie, W.; Hellman, M. (1976). "New directions in cryptography" (PDF). IEEE Transactions on Information Theory. 22 (6): 644–654. Bibcode:1976ITIT
List of pioneers in computer science
List_of_pioneers_in_computer_science
Type of shift register in computing
The repeating sequence of states of an LFSR allows it to be used as a clock divider or as a counter when a non-binary sequence is acceptable, as is
Linear-feedback shift register
Linear-feedback_shift_register
Most advanced technology available
Plough Wedge Weapon Gun Social Accounting Calculation Abacus Calendar Cryptography Lock and key Money Banknote Coin Musical instrument Phonograph Toy Game
High_tech
Type of digital adder
the 512-bit to 2048-bit number sizes that are required in public-key cryptography, carry look-ahead is not of much help. The idea of delaying carry resolution
Carry-save_adder
are considered precursors to the modern Internet. 1970s: Public-key cryptography is invented and developed by James H. Ellis, Clifford Cocks, Malcolm
Timeline of historic inventions
Timeline_of_historic_inventions
Secure speech system
values (one coarse, and one fine), giving thirty-six levels in all. A cryptographic key, consisting of a series of random values from the same set of six
SIGSALY
System for dealing with email spam
paper "Pricing via Processing or Combatting Junk Mail". Hashcash is a cryptographic hash-based proof-of-work algorithm that requires a selectable amount
Hashcash
Blockchain and cryptocurrency
nodes' local clocks, to be sure that the block proposals gossiped in the previous steps have been observed.[citation needed] A new cryptographic sortition
Algorand
Family of microcontrollers
as: Extended performance features, such as DMA, "Event System", and cryptography support Extensive peripheral set with ADCs Application-specific AVR megaAVRs
AVR_microcontrollers
Microprocessor core model by ARM
A64, A32, and T32 (at the EL0 only) Extensions ARMv8.1-A, ARMv8.2-A, cryptography, RAS, ARMv8.3-A LDAPR instructions, ARMv8.4-A dot product Products, models
ARM_Cortex-X1
Form of computer data storage
RAM servers to keep all runtime state, including session metadata and cryptographic material, in volatile memory. This is intended to improve security relative
Random-access_memory
Supercomputer by Cray Research
1992 film Sneakers, whose story is centered around extremely high-level cryptography, two lead characters have an important discussion while sitting on a
Cray_Y-MP
Form of pseudorandom number generator
based on a linear-feedback shift register (LFSR) are studied for use in cryptography.[who?] In difference to the shrinking generator, which uses a second
Self-shrinking_generator
CLOCK CRYPTOGRAPHY
CLOCK CRYPTOGRAPHY
Boy/Male
Basque, Biblical, French, German, Hebrew
A Flock; Herd
Boy/Male
Indian
Latch, Door lock
Girl/Female
Arabic, Muslim
Clock
Biblical
a flock
Surname or Lastname
English
English : see Cleek.Possibly an Americanized spelling of German Klick, Jewish Glick, or German and Jewish Glück (see Gluck).
Surname or Lastname
German and Dutch
German and Dutch : from Middle High German bloch, Middle Dutch blok ‘block of wood’, ‘stocks’. The surname probably originated as a nickname for a large, lumpish man, or perhaps as a nickname for a persistent lawbreaker who found himself often in the stocks.English : possibly a metonymic occupational name for someone who blocks, as in shoemaking and bookbinding, from Middle English blok ‘block’.Jewish (Ashkenazic) : Americanized spelling of Bloch (see Vlach).Adriaen Coertsz Block was a Dutch-born merchant-explorer who traded along the CT coast and Long Island shortly after Hudson’s voyage to the region in 1609. Block Island, between the north fork of Long Island and RI, which he used as a base of operations, is named after him.
Boy/Male
British, English, Irish
Woods; Fortified Place; Bright; Radiant
Girl/Female
Muslim
Clock
Boy/Male
Hebrew
Of God's flock.
Surname or Lastname
Americanized spelling of German Krock.English
Americanized spelling of German Krock.English : perhaps a metonymic occupational name for a potter, from Middle English crock ‘pot’.
Boy/Male
Hebrew
Of God's flock.
Surname or Lastname
English
English : topographic name for someone who lived on a small plot of land, from Middle English plocke ‘small piece of ground’.Americanized spelling of German Ploch.Variant of German Block.
Boy/Male
Indian, Malayalam
Clock
Boy/Male
Gaelic
Little cloak.
Surname or Lastname
English
English : from a Middle English personal name Clac, which is from Old English Clacc or the Old Norse cognate Klakkr. As a personal name this is from a word meaning ‘lump’ and may have been used as a nickname for a large or thickset man. Reaney suggests that it could also be from clacker ‘chatterer’.
Surname or Lastname
English
English : metonymic occupational name for a locksmith, from Middle English, Old English loc ‘lock’, ‘fastening’.English : topographic name for someone who lived near an enclosure, a place that could be locked, Middle English loke, Old English loca (a derivative of loc as in 1). Middle English loke also came to be used to denote a barrier, in particular a barrier on a river which could be opened and closed at will, and, by extension, a bridge. The surname may thus also have been a metonymic occupational name for a lock-keeper.English, Dutch, and German : nickname for a person with fine hair, or curly hair, from Middle English loc, Middle High German lock(e) ‘lock (of hair)’, ‘curl’.Americanized spelling of German Loch.
Girl/Female
Arabic
Lock; Awesome
Surname or Lastname
English
English : of uncertain origin; possibly a nickname for someone with thick curly hair, from Old French floc ‘stable of wool’. Alternatively, it may be a metonymic occupational name for a shepherd, from Old English flocc ‘herd’, ‘company’.German : unexplained.German (Flöck) : variant of Flück (see Fluck), or from a pet form of a personal name formed with Old Saxon flÅd ‘flood’.
Boy/Male
Biblical Hebrew
A flock.
Girl/Female
German, Hebrew, Irish
Flock of Sheep
CLOCK CRYPTOGRAPHY
CLOCK CRYPTOGRAPHY
Girl/Female
Greek
The mystic goddess of an ancient Greek brotherhood.
Surname or Lastname
English
English : patronymic from Rawling.
Boy/Male
Bengali, Indian
Excellence; Well-being; Superior; Best; Eminent
Biblical
drunkenness; his gift; his wages
Male
Spanish
Spanish form of Latin Augustinus, AGUSTÃN means "venerable."
Boy/Male
Tamil
Karna
Girl/Female
Hindu, Indian
Forwarding the Generation; A Nice Girl
Girl/Female
American, British, English
Swift
Girl/Female
Bengali, Christian, Indian, Kannada
Light; Powerful
Male
Greek
(Ήφαιστος) Greek name said to be pre-Hellenic and of unknown origin, but possibly from the word hepta, HEPHAISTOS means "seven." In mythology, this is the name of the lame god of artisans, craftsmen, metallurgy and fire. His Roman name is Vulcan. It was from the forge of this god that Promêtheus stole fire to give to man. He is also known by the epithet "both feet crooked."
CLOCK CRYPTOGRAPHY
CLOCK CRYPTOGRAPHY
CLOCK CRYPTOGRAPHY
CLOCK CRYPTOGRAPHY
CLOCK CRYPTOGRAPHY
v. t.
To move with the sound of a click.
n.
A lock of wool or hair.
n.
A click. See 3d Click, 2.
v. t.
To coat with flock, as wall paper; to roughen the surface of (as glass) so as to give an appearance of being covered with fine flock.
n.
To shape on, or stamp with, a block; as, to block a hat.
n.
The striking of a clock.
v. t.
To prevent ingress or access to, or exit from, by fastening the lock or locks of; -- often with up; as, to lock or lock up, a house, jail, room, trunk. etc.
v. t.
A section of a railroad where the block system is used. See Block system, below.
v. t. & i.
To call, as a hen. See Cluck.
v. i.
To give off crock or smut.
v. t.
To lay up in a crock; as, to crock butter.
v. t.
To stop or fasten, as with a wedge, or block; to scotch; as, to chock a wheel or cask.
n.
The act of cocking; also, the turn so given; as, a cock of the eyes; to give a hat a saucy cock.
adv.
Entirely; quite; as, chock home; chock aft.
v. t.
To fasten with a lock, or as with a lock; to make fast; to prevent free movement of; as, to lock a door, a carriage wheel, a river, etc.
v. t.
To cover with, or as with, a cloak; hence, to hide or conceal.
v. t.
To flock to; to crowd.
v. t.
To fasten in or out, or to make secure by means of, or as with, locks; to confine, or to shut in or out -- often with up; as, to lock one's self in a room; to lock up the prisoners; to lock up one's silver; to lock intruders out of the house; to lock money into a vault; to lock a child in one's arms; to lock a secret in one's breast.
n.
The hammer in the lock of a firearm.