CA2076252A1 - Cryptographic protocol for secure communications - Google Patents

Cryptographic protocol for secure communications

Info

Publication number
CA2076252A1
CA2076252A1 CA2076252A CA2076252A CA2076252A1 CA 2076252 A1 CA2076252 A1 CA 2076252A1 CA 2076252 A CA2076252 A CA 2076252A CA 2076252 A CA2076252 A CA 2076252A CA 2076252 A1 CA2076252 A1 CA 2076252A1
Authority
CA
Canada
Prior art keywords
bob
alice
sends
decrypts
challenge
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.)
Granted
Application number
CA2076252A
Other languages
French (fr)
Other versions
CA2076252C (en
Inventor
Steven Michael Bellovin
Michael Merritt
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.)
AT&T Corp
Original Assignee
American Telephone and Telegraph Co 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 American Telephone and Telegraph Co Inc filed Critical American Telephone and Telegraph Co Inc
Publication of CA2076252A1 publication Critical patent/CA2076252A1/en
Application granted granted Critical
Publication of CA2076252C publication Critical patent/CA2076252C/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
    • H04L9/0838—Key agreement, i.e. key establishment technique in which a shared key is derived by parties as a function of information contributed by, or associated with, each of these
    • H04L9/0841—Key agreement, i.e. key establishment technique in which a shared key is derived by parties as a function of information contributed by, or associated with, each of these involving Diffie-Hellman or related key agreement protocols
    • H04L9/0844—Key agreement, i.e. key establishment technique in which a shared key is derived by parties as a function of information contributed by, or associated with, each of these involving Diffie-Hellman or related key agreement protocols with user authentication or key authentication, e.g. ElGamal, MTI, MQV-Menezes-Qu-Vanstone protocol or Diffie-Hellman protocols using implicitly-certified keys

Abstract

A cryptographic communication system. The system, which employs a novel combination of public and private key cryptography, allows two parties, who share only a relatively insecure password, to bootstrap a computationally securecryptographic system over an insecure network. The system is secure against active and passive attacks, and has the property that the password is protected againstoff-line "dictionary" attacks. If Alice and Bob are two parties who share the password P
one embodiment of the system involves the following steps: (1) Alice generates arandom public key E, encrypts it with P and sends P(E) to Bob; (2) Bob decrypts to get E, encrypts a random secret key R with E and sends E(R) to Alice; (3) Alice decrypts to get R, generates a random challenge CA and sends R (CA) to Bob; (4) Bob decrypts to get CA, generates a random challenge CB and sends R (CA ,CB) to Alice; (5) Alice decrypts to get (CA ,CB), compares the first against the challenge and sends R(CB) to Bob if they are equal; (6) Bob decrypts and compares with theearlier challenge; and (7) Alice and Bob can use R as a shared secret key to protect the session.
CA002076252A 1991-10-02 1992-08-17 Cryptographic protocol for secure communications Expired - Lifetime CA2076252C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US770,064 1991-10-02
US07/770,064 US5241599A (en) 1991-10-02 1991-10-02 Cryptographic protocol for secure communications

Publications (2)

Publication Number Publication Date
CA2076252A1 true CA2076252A1 (en) 1993-04-03
CA2076252C CA2076252C (en) 1998-08-25

Family

ID=25087362

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002076252A Expired - Lifetime CA2076252C (en) 1991-10-02 1992-08-17 Cryptographic protocol for secure communications

Country Status (7)

Country Link
US (1) US5241599A (en)
EP (2) EP1104959B1 (en)
JP (1) JP2599871B2 (en)
AU (1) AU648433B2 (en)
CA (1) CA2076252C (en)
DE (2) DE69232369T2 (en)
NO (1) NO923740L (en)

Families Citing this family (233)

* Cited by examiner, † Cited by third party
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