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Topic: Key schedule


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In the News (Tue 25 Jun 19)

  
  Key (cryptography) - Wikipedia, the free encyclopedia
Keys are also used in other cryptographic algorithms, such as digital signature schemes and keyed-hash functions (also known as MACs), often used for authentication.
A newer class of "public key" cryptographic algorithms was discovered in the 1970s which use a pair of keys, one to encrypt and one to decrypt.
When a password (or passphrase) is used as an encryption key, well-designed cryptosystems first run it through a key-derivation algorithm which adds salt and reduces or expands it to the key length desired, for example by reducing a long phrase into a 128-bit value suitable for use in a block cipher.
en.wikipedia.org /wiki/Key_(cryptography)   (854 words)

  
 Key West attractions, hotels, fishing charters, diving, things to do, real estate Key West, Florida
Whether you are searching for a tropical getaway in downtown Key West that is close to it all, a cottage on the beach or the convenience of a condo where your boat is tied to the dock, the Key West real estate agents and mortgage companies can help.
Key West's Historic Seaport and other venues are transformed into a pirates stronghold with sea battles, a thieves market, sunset pirate sails, a living history encampment and nonstop entertainment.
Key West celebrates New Year's Eve with a wench drop at Schooner Wharf Bar, the conch shell drop at Sloppy Joe's Bar and the red high heel drop with drag queen Sushi at Bourbon Street Pub.
www.keywest.com   (1140 words)

  
 An observation on the Key Schedule of Twofish - Mirza, Murphy (ResearchIndex)   (Site not responding. Last check: 2007-11-06)
An observation on the Key Schedule of Twofish - Mirza, Murphy (ResearchIndex)
An observation on the Key Schedule of Twofish (1999)
37.5%: An observation on the Key Schedule of Twofish - Mirza, Murphy (1999)
citeseer.ist.psu.edu /264797.html   (479 words)

  
 Cryptanalysis of ICE
These keys can be found by setting up a series of linear (under XOR) equations expressing the fact that the schedule of key 1 is the reverse of the schedule of key 2, then solving the equations.
However, since the keyed permutation acts to simply swap bits between the left and right halves of a 32-bit value, the attacker can use inputs whose leftmost 16 bits are the same as the rightmost 16 bits.
ICE avoids this weakness in its extended variants by extending the key schedule with insertions in the middle of the schedule.
www.ussrback.com /crypto/ice/cryptanalysis.html   (769 words)

  
 Recursive key schedule cryptographic system - Patent 4776011
First, the working table memory is loaded with initial, predetermined key schedule data and, thereafter, the exclusive OR logic means is caused to exclusive OR a code word in predetermined groups of bits with an entry in the master table memory which is selected by reference to the count in one of the counters.
The exclusive OR means 24, the key schedule array memory 26, the asymmetric bit shuffler 28, the look-up table means 30, and the counters 36, 38 and 40 are all under the control of a CPU 42 which is connected to them.
Thus, the operating key schedule array 14 is regenerated simply using the code word 10 and the initial key schedule array which was retained by the recipient of the encrypted text.
www.freepatentsonline.com /4776011.html   (4823 words)

  
 Eksblowfish Algorithm
The salt is a 128-bit value that modifies the key schedule so that the same key need not always produce the same result, as motivated by Section 3.
Finally, the key argument is a secret encryption key, which can be a user-chosen password of up to 56 bytes (including a terminating zero byte when the key is an ASCII string).
The key is viewed as being cyclic; when the process reaches the end of the key, it starts reusing bits from the beginning to XOR with subkeys.
www.usenix.org /events/usenix99/full_papers/provos/provos_html/node4.html   (787 words)

  
 [No title]   (Site not responding. Last check: 2007-11-06)
A key is passed to a perl function as an 8-byte string.
There is a certain amount of overhead in creating these key schedules (which are 128 bytes or 256 bytes depending on implementation and architecture) so they can be created and cached for later if desired.
CBC mode is used to generate an 8-byte cryptographic checksum using key schedule SCHEDULE and initialisation vector IV.
search.cpan.org /src/MICB/Des-perl-a1/Des.pod   (849 words)

  
 search.cpan.org: Des - Des extension module for Perl   (Site not responding. Last check: 2007-11-06)
A key is passed to a perl function as an 8-byte string.
Before keys can be used to encrypt or decrypt data, the key needs to be transformed into a key schedule using the function set_key.
The DES key KEY (which must be a string of exactly 8 bytes) is turned into a key schedule which is returned.
search.cpan.org /~MICB/Des-perl/Des.pod   (838 words)

  
 ! Aware to man pages: kerberos(3)
It then cre- ates a key schedule from it and saves the original key to be used as an initialization vector.
The private session key, pointed to by key and the key schedule, schedule, are used to encrypt the data and some header information using pcbc_encrypt.
The private session key, pointed to by key, and the key schedule, schedule, are used to decrypt and verify the received message.
www.rocketaware.com /man/man3/kerberos.3.htm   (1781 words)

  
 On The Twofish Key Schedule - Schneier, Kelsey, Whiting, Wagner, Hall, Ferguson (ResearchIndex)
Abstract: Twofish is a new block cipher with a 128 bit block, and a key length of 128, 192, or 256 bits, which has been submitted as an AES candidate.
40.4%: On the Twofish Key Schedule - Schneier, Kelsey, Whiting, Wagner..
Schneier, J. Kelsey, D. Whiting, D. Wagner, C. Hall, and N. Ferguson, "On the Twofish Key Schedule," Proceedings of the 1998 SAC Conference, Springer-Verlag, 1998, pp.
citeseer.ist.psu.edu /348293.html   (448 words)

  
 RC6 Hardware Implementation Specification
Key Schedule is an important process in the CRYPTON algorithm, and has to work in synchronization with both encryption and decryption.
The Key Schedule will be responsible for scheduling the keys properly for each mode encryption or decryption.
Key Schedule will take in 256-bit user key, and schedule the keys for all rounds of encryption and decryption The key scheduling mechanisms for encryption will be different from the decryption.
mason.gmu.edu /~kgaj/ECE590/spec/nguyen.html   (934 words)

  
 Chapter 3. The Advanced Encryption Standard
It consists of a key for each round, which is the same size as the data block size.
The expanded key is usually represented by the array W, which is a linear array of 32 bit words.
The number of rounds is dependent on the block size of both the key and the block that you are encrypting.
www.crhc.uiuc.edu /~grier/crypto/html/ch03.html   (643 words)

  
 ! Aware to man pages: des_crypt(3)
The key schedule is an expanded form of the key; it is used to speed the encryption process.
The new key is placed in the des_cblock that was passed (by reference) to the routine.
The data being read from fd is assumed to have come from des_enc_write and is decrypted using sched for the key schedule and iv for the initial vector.
www.rocketaware.com /man/man3/des_crypt.3.htm   (1637 words)

  
 des(3) - Plan 9 from User Space
The Digital Encryption Standard (DES) is a shared key or symmetric encryption using either a 56 bit key for single DES or three 56 bit keys for triple des.
It takes a key schedule, a pointer to the block, and a flag indicating encrypting (0) or decrypting (1).
The key schedule is created from the key using des_key_setup.
swtch.com /plan9port/man/man3/des.html   (358 words)

  
 美国专利申请公开说明书 20040208318 - Apparatus and method for providing user-generated key schedule in a ...   (Site not responding. Last check: 2007-11-06)
The cryptographic instruction is received by a computing device as part of an instruction flow executing on the computing device.
The cryptographic instruction prescribes one of the cryptographic operations, and also prescribes that a user-generated key schedule be employed when executing the one of the cryptographic operations.
The execution logic employs the user-generated key schedule to execute the one of the cryptographic operations.
cxp.paterra.com /uspregrant20040208318cn.html   (169 words)

  
 Newman Library : Services : Key Fine Schedule   (Site not responding. Last check: 2007-11-06)
Generally, if a key is returned late there is a fine of $.02 (two cents) per minute.
Should a key be returned after the service desk is closed, fines will accrue at the rate stated above (regardless of whether or not the library is open) until that key is checked-in at the opening of the service desk on the next regularly scheduled business day or until physically returned.
If a key is lost, the person borrowing the key is responsible for the replacement of the key and accompanying lock, (currently $100.00), services fee ($10.00), and overdue fines.
newman.baruch.cuny.edu /SERVICES/key_fines.htm   (287 words)

  
 deseretnews.com | Strength of schedule key factor in NCAA selection
Teams that Bowlsby cites as upgrading their schedules, such as Alabama and Gonzaga, don't appear to be in trouble this year.
An easier schedule might have produced 17 or 18 wins — enough, possibly, to guarantee a spot in the field.
The Terrapins entered the ACC tourney with a 16-11 mark, a 7-9 conference record and the eighth-toughest schedule in the nation.
deseretnews.com /dn/view/0,1249,600118357,00.html   (659 words)

  
 [No title]
It uses a variable size key, but typically, 128 bit (16 byte) keys are a considered good for strong encryption.
Blowfish consists of a key setup phase and the actual encryption or decryption phase.
It encrypts or decrypts the first 64 bits of in using the key key, putting the result in out.
www.ibiblio.org /gferg/ldp/man/man3/blowfish.3ssl.html   (586 words)

  
 SSLeay 0.9.0b docs
key_len is the length of the key in bytes.
EVP_BytesToKey() is used to generate a key and an ivec for a specified cipher from a key string and a salt.
The newly generated key and ivec are returned in key and iv.
www.columbia.edu /~ariel/ssleay/evp_symmciphers.html   (1805 words)

  
 SSLeay 0.9.0b docs
It uses a variable size key; 16 bytes is usually considered a good length.
It can be regenerated from the Blowfish key so it only needs to be kept when encryption or decryption is about to occur.
len is the number of bytes of key to be used as the key.
www.umich.edu /~x509/ssleay/blowfish.html   (768 words)

  
 SSLeay 0.9.0b docs
It can be regenerated from the IDEA key so it only needs to be kept when encryption is about to occur.
Please note that there is no quick way to generate the decryption key schedule other than generating the encryption key schedule and then converting it.
Encryption or decryption is performed depending on the key schedule.
www.columbia.edu /~ariel/ssleay/idea.html   (1009 words)

  
 A Key-schedule Weakness in SAFER K-64 - Knudsen (ResearchIndex)   (Site not responding. Last check: 2007-11-06)
In this paper we analyse SAFER K-64 and show a weakness in the key schedule.
It has the effect that for almost every key K, there exists at least one different key K, such that for many plaintexts the outputs after 6 rounds of encryption are equal.
Also, the same types of keys encrypt even more pairs of plaintexts different in one byte to ciphertexts different only in the same byte.
citeseer.lcs.mit.edu /knudsen95keyschedule.html   (500 words)

  
 SCHEDULE 5.9 - Key System Assets
LUL shall be entitled to designate the property, rights and liabilities of Infraco under any Key Sub-Contract as a Primary Asset at any time during the Contract Period by serving a notice on Infraco specifying the relevant property, rights or liabilities.
Any Primary Assets and/or Key System Assets which are not so transferred shall cease to be designated as Primary Assets and Key System Assets or Key System Assets, as the case may be, forty (40) days after the Expiry Date, or on the Contract Disposal Date, as the case may be.
Key System Assets shall cease to be designated Key System Assets on the date specified in such notice.
www.londontransport.co.uk /tfl/about/tube-plans/ppp/3_2_468_1.asp   (2788 words)

  
 Tentative Schedule of Key Events   (Site not responding. Last check: 2007-11-06)
A tentative 38 day schedule of key events for the 1999 General Session is available below.
Many of these key events can be changed literally during the day on which they were tentatively scheduled to occur and without notice.
It is generally followed fairly closely, but the volume and complexity of legislation requires flexibility with respect to many of these key events.
legisweb.state.wy.us /99sessin/schedmem.htm   (106 words)

  
 PAA: Boston University - Medical News Inc.   (Site not responding. Last check: 2007-11-06)
A recent survey shows that 715 hospitals operate at 90 percent occupancy during peak periods — a trend that has filled institutions to the saturation point and forced emergency rooms to routinely close their doors to new ambulance traffic.
The key to controlling occupancy, says Dr. Eugene Litvak, is taking control of the variability in elective surgeries.
Asked if some hospitals were likely to cater to surgeons and their schedules for elective surgery — big sources of revenue for any hospital — Litvak replied “Maybe.
www.parnold.com /articles/buman/bumanmedicalnewsinc.htm   (666 words)

  
 SAFER   (Site not responding. Last check: 2007-11-06)
There was some demand for a version with a larger 128-bit key, and the following year Massey published such a variant incorporating new key schedule designed by the Singapore Ministry for Home affairs: SAFER K-128.
Another variant with a reduced key size was published, SAFER SK-40, to comply with 40-bit export restrictions.
Massey, J. L., "Announcement of a Strengthened Key Schedule for the Cipher SAFER", September 9, 1995.
www.worldhistory.com /wiki/S/SAFER.htm   (651 words)

  
 The Britannica Stream Cipher
That means we need a different key for every "message," and so probably implies at least a message key in addition to the data, which thus expands the ciphertext.
(The key determines the initial fill and some of the feedback parameters.) It is easy enough to combine the (variable) message sequence number with the (fixed) key to produce a different set of cryptovariables for each message.
The plaintext is loaded into the main register, which is stepped a number of times selected by the key register, and the result is the ciphertext; then the key register is stepped enough to diffuse the bits around some.
www.ciphersbyritter.com /NEWS5/BRITSTRM.HTM   (7206 words)

  
 Schedule Wizard Free Download by Author Direct Shareware: (automate, automation, schedule, scheduler, scheduling, ...   (Site not responding. Last check: 2007-11-06)
Schedule Wizard provides a friendly interface to let you to schedule a variety of timed events.
Many scheduling options are available, including alarms and advance warnings for upcoming events.
You can easily view scheduled events by date, category, or specific selections and can also printed them in a variety of reports.
www.fileboost.net /directory/business/organizers/schedule_wizard/003853/review.html   (195 words)

  
 SSLeay 0.9.0b docs
The des_cblock pointed to by input is encrypted into the block pointed to by output (which may be the same as input) using the key represented by ks.
DESX is defined as key1 xor (des (key2 xor input)), where the des encryption is done with a third key key3.
It should be initialized to a known (but randomly generated) state before this function is called on the first part of a piece of data.
www.umich.edu /~x509/ssleay/des-std.html   (1002 words)

  
 Key to Schedule
FLO This symbol designates a course or +2 which offers a "Foreign Language Option." In these courses, the instructor has identified materials in selected languages that will be available upon request to those students wishing to substitute or add course work in a foreign language.
Consult the complete listing at the back of this schedule for the specific languages available.
X An "X" in the course identifier indicates that the course should not be entered on the preregistration card.
web.grinnell.edu /Registrar/SCHEDULE_KEY.html   (243 words)

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