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GB2386523B - Symmetric key cryptosystem - Google Patents

Symmetric key cryptosystem

Info

Publication number
GB2386523B
GB2386523B GB0206094A GB0206094A GB2386523B GB 2386523 B GB2386523 B GB 2386523B GB 0206094 A GB0206094 A GB 0206094A GB 0206094 A GB0206094 A GB 0206094A GB 2386523 B GB2386523 B GB 2386523B
Authority
GB
United Kingdom
Prior art keywords
key
data
algorithm
confidentiality
message
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
GB0206094A
Other versions
GB0206094D0 (en
GB2386523A (en
Inventor
Samual James Golightly
Stuart James Kennedy
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ETERNITY LICENSING Ltd
Original Assignee
ETERNITY LICENSING Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ETERNITY LICENSING Ltd filed Critical ETERNITY LICENSING Ltd
Priority to GB0206094A priority Critical patent/GB2386523B/en
Publication of GB0206094D0 publication Critical patent/GB0206094D0/en
Publication of GB2386523A publication Critical patent/GB2386523A/en
Application granted granted Critical
Publication of GB2386523B publication Critical patent/GB2386523B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/06—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols the encryption apparatus using shift registers or memories for block-wise or stream coding, e.g. DES systems or RC4; Hash functions; Pseudorandom sequence generators
    • H04L9/0618—Block ciphers, i.e. encrypting groups of characters of a plain text message using fixed encryption transformation
    • H04L9/0637—Modes of operation, e.g. cipher block chaining [CBC], electronic codebook [ECB] or Galois/counter mode [GCM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
    • H04L2209/08—Randomization, e.g. dummy operations or using noise
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
    • H04L2209/12—Details relating to cryptographic hardware or logic circuitry

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Storage Device Security (AREA)

Abstract

A symmetric (shared key) key encryption system which encodes message data using an algorithm, a secret key(1) and a random initial message(5) and a matching decryption system which decodes encrypted data using an algorithm and the same secret key(1). The system uses an irreversible function and a random initial message(5) to obscure the key(1) from cryptographic analysis, resulting in a system with a high level of data confidentiality at the same time as low resource utilisation and high speed operation. Confidentiality is further enhanced by the essentially linear relationship between key length and the product of resource utilisation and processing time per unit message data, allowing the system architect to select a longer key length without disproportionate increase in complexity or power consumption or decrease in speed.
GB0206094A 2002-03-15 2002-03-15 Symmetric key cryptosystem Expired - Fee Related GB2386523B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0206094A GB2386523B (en) 2002-03-15 2002-03-15 Symmetric key cryptosystem

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0206094A GB2386523B (en) 2002-03-15 2002-03-15 Symmetric key cryptosystem

Publications (3)

Publication Number Publication Date
GB0206094D0 GB0206094D0 (en) 2002-04-24
GB2386523A GB2386523A (en) 2003-09-17
GB2386523B true GB2386523B (en) 2005-02-23

Family

ID=9933012

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0206094A Expired - Fee Related GB2386523B (en) 2002-03-15 2002-03-15 Symmetric key cryptosystem

Country Status (1)

Country Link
GB (1) GB2386523B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200708027A (en) * 2005-04-29 2007-02-16 Sean O'neil Process of and apparatus for hashing
EP2553622B1 (en) 2010-03-31 2020-10-21 British Telecommunications public limited company Secure data recorder

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
http://www.cs.tau.ac.il/ïah/Notes/N2.pdf, "Encryption and Randomness", Secure Communication and Commerce with Cryptography, Chapter 4, Amir Herzberg, 11/12/2001 *
http://www.item.uni-bremen.de/research/papers/paper.pdf/Andreas.Schubert/icecs99/icecs99.pdf, "Efficient VLSI implementatern symmertric block ciphers", Schubert and Anheier, 23/12/1999 *

Also Published As

Publication number Publication date
GB0206094D0 (en) 2002-04-24
GB2386523A (en) 2003-09-17

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20090315