WO2001056221B1 - Block encryption method and schemes for data confidentiality and integrity protection - Google Patents

Block encryption method and schemes for data confidentiality and integrity protection

Info

Publication number
WO2001056221B1
WO2001056221B1 PCT/US2001/001534 US0101534W WO0156221B1 WO 2001056221 B1 WO2001056221 B1 WO 2001056221B1 US 0101534 W US0101534 W US 0101534W WO 0156221 B1 WO0156221 B1 WO 0156221B1
Authority
WO
WIPO (PCT)
Prior art keywords
unpredictable
blocks
unpredictable elements
elements
bits
Prior art date
Application number
PCT/US2001/001534
Other languages
French (fr)
Other versions
WO2001056221A3 (en
WO2001056221A2 (en
Inventor
Virgil Dorin Gligor
Pompiliu Donescu
Original Assignee
Vdg Inc
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 Vdg Inc filed Critical Vdg Inc
Priority to AU2001260970A priority Critical patent/AU2001260970A1/en
Priority to EP01934819A priority patent/EP1252738A2/en
Publication of WO2001056221A2 publication Critical patent/WO2001056221A2/en
Publication of WO2001056221A3 publication Critical patent/WO2001056221A3/en
Publication of WO2001056221B1 publication Critical patent/WO2001056221B1/en

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
    • 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
    • H04L9/0643—Hash functions, e.g. MD5, SHA, HMAC or f9 MAC
    • 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
    • H04L9/065—Encryption by serially and continuously modifying data stream elements, e.g. stream cipher systems, RC4, SEAL or A5/3
    • H04L9/0656—Pseudorandom key sequence combined element-for-element with data sequence, e.g. one-time-pad [OTP] or Vernam's cipher
    • 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
    • H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
    • H04L9/3236—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials using cryptographic hash functions
    • H04L9/3242—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials using cryptographic hash functions involving keyed hash functions, e.g. message authentication codes [MACs], CBC-MAC or HMAC
    • 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
    • H04L2209/125—Parallelization or pipelining, e.g. for accelerating processing of cryptographic operations
    • 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
    • H04L2209/20—Manipulating the length of blocks of bits, e.g. padding or block truncation

Abstract

A block encryption method and schemes (modes or operation) that provide both data confidentiality and integrity with a single cryptographic primitive and a single processing pass over the input plaintext string by using a non-cryptographic Manipulation Detection Code function for secure data communication over insecure channels and for secure data storage in insecure media. The present invention allows, in a further aspect, software and hardware implementations, and use in high-performance and low-power applications, and low-power, low-cost hardware devices. The block encryption method and schemes of this invention allow, in yet a further aspect, encryption and decryption in parallel or pipelined manners in addition to sequential operation. In a yet further aspect, the block encryption method and schemes of this invention are suitable for real-time applications.

Claims

- 64 -
AMENDED CLAIMS
[received by the International Bureau on 1 1 December 2001 ( 11.12.01); new claims 65-82 added; remaining claims unchanged (6 pages)]
65. An encryption method for providing both data confidentiality and integrity for a message, comprising the steps of: receiving an input plaintext string comprising a message; generating a plurality of equal-sized blocks of 1 bits in length from the input plaintext string; creating an MDC block of I bits in length that includes the result of applying a non-cryptographic Manipulation Detection Code (MDC) function to the plurality of the equal-sized blocks; making one and only one processing pass with a single cryptographic primitive over each of said equal-sized blocks and the MDC block to create a plurality of hidden ciphertext blocks each of I bits in length; and performing a randomization function over said plurality of hidden ciphertext blocks to create a plurality of output ciphertext blocks each of I bits in length.
66. The method as defined in claim 65, wherein said making one and only one processing pass step comprises processing each of said equal-sized blocks and the MDC block by an encryption scheme that is confidentiality-secure against chosen-plaintext attacks, wherein each of said equal-sized blocks and the MDC block is processed by a block cipher using a first secret key to obtain said plurality of hidden ciphertext blocks; and wherein said performing a randomization function step comprises combining each of said hidden ciphertext blocks with a corresponding element of a sequence of unpredictable elements to create a set of output blocks of the ciphertext, wherein a hidden ciphertext block identified by an index i is combined with the element of the sequence identified by index i by an operation that has an inverse.
67. The method as defined in claim 65, wherein said generating a plurality of equal-sized blocks of I bits in length from the input plaintext string further comprises the steps of: padding the input plaintext string as necessary such that its length is a multiple of I bits; and partitioning the padded input plaintext string into a plurality of equal-size blocks of I bits in length. -65 -
68. The method as defined in claim 67, wherein said padding of the input plaintext string is a standard padding method.
69. The method as defined in claim 66, wherein the result of the combination of any two different unpredictable elements of the sequence of unpredictable elements by the inverse operation of the operation to create a set of output blocks of the ciphertext is unpredictable; and wherein said unpredictable elements selected as said two unpredictable elements are any two different elements of the same sequence of unpredictable elements used for the encryption of said plaintext string; and wherein said unpredictable elements selected as said two unpredictable elements are any two different elements of a plurality of sequences of unpredictable elements used for encryption of a plurality of plaintext strings with the same secret key K.
70. The method as defined in claim 2, wherein the result of the combination of any two different unpredictable elements of the sequence of unpredictable elements by the inverse operation of the operation to create a set of output blocks of the ciphertext is unpredictable; and wherein said unpredictable elements selected as said two unpredictable elements are any two different elements of the same sequence of unpredictable elements used for the encryption of said plaintext string; and wherein said unpredictable elements selected as said two unpredictable elements are any two different elements of a plurality of sequences of unpredictable elements used for encryption of a plurality of plaintext strings with the same secret key K.
71 . A program product for an encryption method for providing both data confidentiality and integrity for a message, including machine-readable code for causing a machine to perform the following method steps: receiving an input plaintext string comprising a message; generating a plurality of equal-sized blocks of I bits in length from the input plaintext string; -66 - creating an MDC block of I bits in length that includes the result of applying a non-cryptographic Manipulation Detection Code (MDC) function to the plurality of the equal-sized blocks; making one and only one processing pass with a single cryptographic primitive over each of said equal-sized blocks and the MDC block to create a plurality of hidden ciphertext blocks each of I bits in length; and performing a randomization function over said plurality of hidden ciphertext blocks to create a plurality of output ciphertext blocks each of I bits in length.
72. The program product defined in claim 71 , wherein the program code for causing the performance of the step of making one and only one processing pass step comprises processing each of said equal-sized blocks and the MDC block by an encryption scheme that is confidentiality-secure against chosen-plaintext attacks, wherein each of said equal-sized blocks and the MDC block is processed by a block cipher using a first secret key to obtain said plurality of hidden ciphertext blocks; and wherein the program code for causing the performing a randomization function step comprises combining each of said hidden ciphertext blocks with a corresponding element of a sequence of unpredictable elements to create a set of output blocks of the ciphertext, wherein a hidden ciphertext block identified by an index i is combined with the element of the sequence identified by index i by an operation that has an inverse.
73. The program product defined in claim 71 , wherein the program code for performing said step of generating a plurality of equal-sized blocks of I bits in length from the input plaintext string further comprises code for performing the steps of: padding the input plaintext string as necessary such that its length is a multiple of I bits; and partitioning the padded input plaintext string into a plurality of equal-size blocks of I bits in length.
74. The program product defined in claim 73, wherein the program code for performing said step of padding of the input plaintext string comprises code for performing a standard padding method.
75. The program product defined in claim 72, -67-
wherein the result of the combination of any two different unpredictable elements of the sequence of unpredictable elements by the inverse operation of the operation to create a set of output blocks of the ciphertext is unpredictable; and wherein said unpredictable elements selected as said two unpredictable elements are any two different elements of the same sequence of unpredictable elements used for the encryption of said plaintext string; and wherein said unpredictable elements selected as said two unpredictable elements are any two different elements of a plurality of sequences of unpredictable elements used for encryption of a plurality of plaintext strings with the same secret key K.
76. The program product defined in claim 48, wherein the result of the combination of any two different unpredictable elements of the sequence of unpredictable elements by the inverse operation of the operation to create a set of output blocks of the ciphertext is unpredictable; and wherein said unpredictable elements selected as said two unpredictable elements are any two different elements of the same sequence of unpredictable elements used for the encryption of said plaintext string; and wherein said unpredictable elements selected as said two unpredictable elements are any two different elements of a plurality of sequences of unpredictable elements used for encryption of a plurality of plaintext strings with the same secret key K.
77. An encryption system for providing both data confidentiality and integrity for a message, comprising: a first component for receiving an input plaintext string comprising a message; a second component for generating a plurality of equal-sized blocks of I bits in length from the input plaintext string; a third component for creating an MDC block of I bits in length that includes the result of applying a non-cryptographic Manipulation Detection Code (MDC) function to the plurality of the equal-sized blocks; a fourth component for making one and only one processing pass with a single cryptographic primitive over each of said equal-sized blocks and the MDC block to create a plurality of hidden ciphertext blocks each of I bits in length; and a fifth component for performing a randomization function over said plurality of hidden ciphertext blocks to create a plurality of output ciphertext blocks each of I bits in length.
78. The system as defined in claim 77, wherein said fourth component for making one and only one processing pass comprises a component for processing each of said equal-size blocks and the MDC block by an encryption scheme that is confidentiality-secure against chosen-plaintext attacks, wherein each of said equal-sized blocks and the MDC block is processed by a block cipher using a first secret key to obtain said plurality of hidden ciphertext blocks; and wherein fifth component for performing a randomization function comprises a component for combining each of said hidden ciphertext blocks with a corresponding element of a sequence of unpredictable elements to create a set of output blocks of the ciphertext, wherein a hidden ciphertext block identified by an index i is combined with the element of the sequence identified by index i by an operation that has an inverse.
79. The system as defined in claim 77, wherein said second component for generating a plurality of equal-sized blocks of I bits in length from the input plaintext string further comprises components for padding the input plaintext string as necessary such that its length is a multiple of I bits; and partitioning the padded input plaintext string into a plurality of equal-size blocks of I bits in length.
80. The system as defined in claim 79, wherein the said component for padding of the input plaintext string comprises a component for a standard padding method.
81 . The system as defined in claim 78, wherein the result of the combination of any two different unpredictable elements of the sequence of unpredictable elements by the inverse operation of the operation to create a set of output blocks of the ciphertext is unpredictable; and -G9 -
wherein said unpredictable elements selected as said two unpredictable elements are any two different elements of the same sequence of unpredictable elements used for the encryption of said plaintext string; and wherein said unpredictable elements selected as said two unpredictable elements are any two different elements of a plurality of sequences of unpredictable elements used for encryption of a plurality of plaintext strings with the same secret key K.
82. The system as defined in claim 53, wherein the result of the combination of any two different unpredictable elements of the sequence of unpredictable elements by the inverse operation of the operation to create a set of output blocks of the ciphertext is unpredictable; and wherein said unpredictable elements selected as said two unpredictable elements are any two different elements of the same sequence of unpredictable elements used for the encryption of said plaintext string; and wherein said unpredictable elements selected as said two unpredictable elements are any two different elements of a plurality of sequences of unpredictable elements used for encryption of a plurality of plaintext strings with the same secret key K.
PCT/US2001/001534 2000-01-31 2001-01-18 Block encryption method and schemes for data confidentiality and integrity protection WO2001056221A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2001260970A AU2001260970A1 (en) 2000-01-31 2001-01-18 Block encryption method and schemes for data confidentiality and integrity protection
EP01934819A EP1252738A2 (en) 2000-01-31 2001-01-18 Block encryption method and schemes for data confidentiality and integrity protection

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US17914700P 2000-01-31 2000-01-31
US60/179,147 2000-01-31

Publications (3)

Publication Number Publication Date
WO2001056221A2 WO2001056221A2 (en) 2001-08-02
WO2001056221A3 WO2001056221A3 (en) 2002-02-07
WO2001056221B1 true WO2001056221B1 (en) 2002-02-28

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Country Status (4)

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US (2) US6973187B2 (en)
EP (1) EP1252738A2 (en)
AU (1) AU2001260970A1 (en)
WO (1) WO2001056221A2 (en)

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