SG11201803741PA - Key sequence generation for cryptographic operations - Google Patents

Key sequence generation for cryptographic operations

Info

Publication number
SG11201803741PA
SG11201803741PA SG11201803741PA SG11201803741PA SG11201803741PA SG 11201803741P A SG11201803741P A SG 11201803741PA SG 11201803741P A SG11201803741P A SG 11201803741PA SG 11201803741P A SG11201803741P A SG 11201803741PA SG 11201803741P A SG11201803741P A SG 11201803741PA
Authority
SG
Singapore
Prior art keywords
sub
keys
key
main key
international
Prior art date
Application number
SG11201803741PA
Inventor
Karine Villegas
Brecht Wyseur
Original Assignee
Nagravision Sa
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
Priority to GBGB1519612.4A priority Critical patent/GB201519612D0/en
Application filed by Nagravision Sa filed Critical Nagravision Sa
Priority to PCT/EP2016/076436 priority patent/WO2017076911A1/en
Publication of SG11201803741PA publication Critical patent/SG11201803741PA/en

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00Cryptographic mechanisms or cryptographic arrangements for secret or secure communication
    • H04L9/06Cryptographic mechanisms or cryptographic arrangements for secret or secure communication 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
    • H04L9/0618Block ciphers, i.e. encrypting groups of characters of a plain text message using fixed encryption transformation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2209/00Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
    • H04L2209/24Key scheduling, i.e. generating round keys or sub-keys for block encryption

Abstract

WO 17 /07 69 11 Al (12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (10) International Publication Number (43) International Publication Date WO 2017/076911 Al 11 May 2017 (11.05.2017) WIPO I PCT 111111111111110111011111111111010111110011111111111111111110111011111111111110111111 (51) International Patent Classification: H04L 9/06 (2006.01) (21) International Application Number: PCT/EP2016/076436 (22) International Filing Date: 2 November 2016 (02.11.2016) (25) Filing Language: English (26) Publication Language: English (30) Priority Data: 1519612.4 6 November 2015 (06.11.2015) GB (71) Applicant: NAGRAVISION SA [CH/CH]; 22-24 Route de Geneve, 1033 Cheseaux-sur-Lausanne (CH). (72) Inventors: VILLEGAS, Karine; c/o Nagravision SA, 22- 24 Route de Geneve, 1033 Cheseaux-sur-Lausanne (CH). WYSEUR, Brecht; c/o Nagravision SA, 22-24 Route de Geneve, 1033 Cheseaux-sur-Lausanne (CH). (74) Agent: KORENBERG, Alexander Tal; Kilburn & Strode LLP, 20 Red Lion Street, London WC1R 4PJ (GB). (81) Designated States (unless otherwise indicated, for every kind of national protection available): AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JP, KE, KG, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (84) Designated States (unless otherwise indicated, for every kind of regional protection available): ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG). Published: with international search report (Art. 21(3)) (54) Title: KEY SEQUENCE GENERATION FOR CRYPTOGRAPHIC OPERATIONS Fig. 5 (57) : Methods, system and devices are provided that generate a sequence of sub-keys for cryptographic operations from a main key. The main key is operated on only once to generate the sub-keys of the sequence, with a transformation comprising one or more one-way functions. The respective bit values of the sub-keys of the sequence are set using respective bit values of the one or more one-way functions. Advantageously, deriving sub-key bits from respective output bits of one or more one-way functions re- moves or at least reduces correlations between the main key and the sub-keys, as well as between sub-keys, making it harder or even impossible to recover the main key or other sub-keys from a single sub-key, for example as found using a side-channel attack. At the same time, by using the main key only once (rather than using the main key each time a sub-key is generated), the vulnerability of the main key to a side-channel attack is reduced, because the opportunities for recovering physical information that could lead to the discovery of the main key are reduced. Specific embodiments use parallel or chained execution of sub-functions to generate respect- ive sub-keys. Other specific embodiments generate all sub-keys from a single one-way function in one go.
SG11201803741PA 2015-11-06 2016-11-02 Key sequence generation for cryptographic operations SG11201803741PA (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GBGB1519612.4A GB201519612D0 (en) 2015-11-06 2015-11-06 Key sequence generation for cryptographic operations
PCT/EP2016/076436 WO2017076911A1 (en) 2015-11-06 2016-11-02 Key sequence generation for cryptographic operations

Publications (1)

Publication Number Publication Date
SG11201803741PA true SG11201803741PA (en) 2018-06-28

Family

ID=55132394

Family Applications (1)

Application Number Title Priority Date Filing Date
SG11201803741PA SG11201803741PA (en) 2015-11-06 2016-11-02 Key sequence generation for cryptographic operations

Country Status (9)

Country Link
US (1) US10742394B2 (en)
EP (1) EP3371928A1 (en)
KR (1) KR20180081559A (en)
CN (1) CN108476132A (en)
BR (1) BR112018009137A8 (en)
GB (1) GB201519612D0 (en)
MX (1) MX2018005700A (en)
SG (1) SG11201803741PA (en)
WO (1) WO2017076911A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109067528B (en) * 2018-08-31 2020-05-12 阿里巴巴集团控股有限公司 Password operation method, work key creation method, password service platform and equipment
CN110572251B (en) * 2019-08-13 2020-09-22 武汉大学 Template attack method and device template attack resistance evaluation method

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5892829A (en) 1997-01-08 1999-04-06 Bell Communications Research, Inc. Method and apparatus for generating secure hash functions
US6185679B1 (en) 1998-02-23 2001-02-06 International Business Machines Corporation Method and apparatus for a symmetric block cipher using multiple stages with type-1 and type-3 feistel networks
EP1997265B1 (en) * 2006-03-10 2020-08-05 Irdeto B.V. Integrity of a data processing system using white-box for digital content protection
CN1878059A (en) * 2006-07-07 2006-12-13 北京财富投资有限公司 Grouping encryption and decryption algorithm
US8130946B2 (en) * 2007-03-20 2012-03-06 Michael De Mare Iterative symmetric key ciphers with keyed S-boxes using modular exponentiation
US20080304664A1 (en) * 2007-06-07 2008-12-11 Shanmugathasan Suthaharan System and a method for securing information
US20090245510A1 (en) * 2008-03-25 2009-10-01 Mathieu Ciet Block cipher with security intrinsic aspects
EP2197144A1 (en) 2008-12-15 2010-06-16 Thomson Licensing Methods and devices for a chained encryption mode
CN101895389B (en) * 2010-07-16 2012-06-06 黑龙江大学 Methods for encrypting and decrypting combined coding based file by adopting proportion calculation

Also Published As

Publication number Publication date
CN108476132A (en) 2018-08-31
US10742394B2 (en) 2020-08-11
EP3371928A1 (en) 2018-09-12
GB201519612D0 (en) 2015-12-23
KR20180081559A (en) 2018-07-16
BR112018009137A8 (en) 2019-02-26
MX2018005700A (en) 2018-12-11
US20180316490A1 (en) 2018-11-01
BR112018009137A2 (en) 2018-11-06
WO2017076911A1 (en) 2017-05-11

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