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THE MINISTRY OF INFORMATION AND COMMUNICATIONS
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THE SOCIALIST REPUBLIC OF VIETNAM
Independence - Freedom - Happiness
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No. 22/2020/TT-BTTTT
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Hanoi, September 07, 2020
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CIRCULAR
TECHNICAL REQUIREMENTS APPLICABLE
TO DIGITAL SIGNATURE SOFTWARE AND DIGITAL SIGNATURE CHECKING SOFTWARE
Pursuant to the Law
on E-Transactions dated November 29, 2005;
Pursuant to the
Government’s Decree No. 130/2018/ND-CP dated September 27, 2018 on guidelines
for the Law on E-Transactions regarding digital signatures and digital
signature authentication;
Pursuant to the
Government’s Decree No. 17/2017/ND-CP dated February 17, 2017 defining the
functions, tasks, powers and organizational structure of the Ministry of
Information and Communications;
At the request of
the Director of the National Electronic Authentication Centre,
The Minister of
Information and Communications hereby promulgates a Circular on technical
requirements applicable to digital signature software and digital signature
checking software.
Chapter
I
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Article
1. Scope
1. This Circular
provides for technical requirements applicable to digital signature software
and digital signature checking software.
2. Technical
requirements applicable to digital signature software and digital signature
checking software for digital signatures on electronic documents of regulatory
agencies are not governed by this Circular.
Article
2. Regulated entities
1. This Circular
applies to organizations and individuals that opt to use digital signature software
and digital signature checking software to make e-transactions; certification
authorities; organizations and individuals that develop digital signature
applications and use digital signatures.
2. This Circular does
not apply to specialized certification authorities of the Government.
Article
3. Definitions
1. “digital
certificate for organization” means a form of electronic certificate issued by
a certification authority in order to provide identity for the public key of an
organization to certify that such organization is the signer of the digital
signature by using corresponding private key.
2. “digital
certificate for individual” means a form of electronic certificate issued by a
certification authority in order to provide identity for the public key of an
individual to certify that such individual is the signer of the digital
signature by using corresponding private key.
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4. “private key for
individual” means a key corresponding to the digital certificate for an
individual.
5. “digital signature
software” means independent software or a software module or a solution that
performs the function of attaching digital signatures to data messages.
6. “digital signature
checking software” means independent software or a software module or a
solution that performs the function of checking validity of digital signatures
attached to digital signature data messages.
7. “trusted path on a
digital certificate” means a web address on a digital certificate showing the
certification authority which issued that digital certificate.
Chapter
II
TECHNICAL
REQUIREMENTS APPLICABLE TO DIGITAL SIGNATURE SOFTWARE AND DIGITAL SIGNATURE
CHECKING SOFTWARE
Section
1- Digital signature software
Article
4. General requirements
Technical standards
for digital signatures attached to data messages in the List of technical
standards for digital signatures attached to data messages promulgated together
with this Circular shall be complied with.
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1. Attaching digital
signatures:
a) If the singer of
digital messages attached to data messages is an individual, such signer is
allowed to use the individual private key to attach digital signatures to data
messages;
b) If the singer of
digital messages attached to data messages is an organization, such signer is
allowed to use the private key for organization to attach digital signatures to
data messages.
2. Checking validity
of digital certificates:
a) Digital
certificates of persons attaching digital signatures to data messages are
checked via the trusted path on such digital certificates and also checked by
the national certification authority.
b) The checking of
validity of a digital certificate at the digital signature time shall focus on:
- Validity period of
the digital certificate;
- Status of the
digital certificate through the Certificate Revocation List (CRL) published at
the digital signature time or through the Online Certificate Status Protocol
(OCSP) in the case where the certification authority provides OCSP services.
- Cryptographic
algorithms used on the digital certificate;
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c) The digital
certificate remains valid if the following criteria are met:
- The validity period
on the digital certificate remains unexpired at the digital signature time;
- Cryptographic
algorithms used on the digital certificate comply with compulsorily applied
technical regulations and standards for digital signatures and digital
signature authentication which remain effective;
- The digital
certificate remains operational at the digital signature time;
- The digital
certificate is used for intended purposes and within the intended scope.
3. Storage and
cancellation of the following pieces of information attached to digital
signature data messages:
a) Digital
certificates corresponding to private keys which signers use to sign data
messages at the digital signature time;
b) List of
certification authorities’ digital certificates revoked at the signature time
that correspond to digital signatures attached to outgoing data messages;
c) Validation
etiquettes of certification authorities issuing digital certificates that
correspond to the digital signatures attached to outgoing data messages;
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4. Change (addition or
reduction) of digital signatures of certification authorities.
5. Notification (in
alphabetical letters/symbols) of checking whether a digital signature is valid
or not.
Section
2-Digital signature checking software
Article
6. General requirements
Technical standards for
digital signatures attached to data messages in the List of technical standards
for digital signatures attached to data messages promulgated together with this
Circular shall be complied with.
Article
7. Functional requirements
1. Checking of
validity of digital signatures affixed to data messages:
a) Digital signatures
affixed to data messages are verified according to the principle: a digital
signature is generated from a private key corresponding to the public key on
the digital certificate;
b) Digital
certificates of persons attaching digital signatures to data messages are
checked via the trusted path on such digital certificates and also checked by
the national certification authority.
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- Validity period of
the digital certificates;
- Status of the
digital certificates through the Certificate Revocation List (CRL) published at
the time of attaching the digital signature or through the Online Certificate
Status Protocol (OCSP) in the case where the certification authority provides
OCSP services.
- Cryptographic
algorithms used on the digital certificates;
- Purpose and scope of
the digital certificates.
d) A digital certificate
remains valid if the following criteria are met:
- The validity
period on the digital certificate remains unexpired at the digital signature
time;
- Cryptographic
algorithms used on the digital certificate comply with compulsorily applied
technical regulations and standards for digital signatures and digital
signature authentication which remain effective;
- The digital
certificate remains operational at the digital signature time;
- The digital
certificate is used for intended purposes and within the intended scope.
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- Decrypt the digital
signature on each data message to obtain information about the hash value;
- Use the secure hash
algorithm that generated the hash value on the digital signature to generate a
hash value for the data message;
- Compare the two hash
values to check if whether they match, thereby checking the integrity of the
digital signature data message.
e) A digital signature
on the data message is considered valid if:
- Information about
the signer has been checked and verified;
- The signer’s digital
certificate remains valid at the signature time;
- Digital signature on
the data message matches the private key corresponding to the public key on the
digital certificate and integrity of the data message is ensured.
2. Storage and
cancellation of the following pieces of information attached to digital
signature data messages:
a) Digital
certificates corresponding to digital signatures attached to incoming digital
signature data messages;
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c) Validation
etiquettes of certification authorities issuing digital certificates that
correspond to digital signatures attached to incoming data messages;
d) Results of checking
of digital certificate status appropriate for digital signatures attached to
incoming data messages.
3. Change (addition or
reduction) of digital signatures of certification authorities.
4. Notification (in
alphabetical letters/symbols) of checking whether a digital signature is valid
or not.
Chapter III
IMPLEMENTATION
CLAUSE
Article 8. Implementation
1. The National
Electronic Authentication Centre shall provide guidelines for the
implementation of this Circular.
2. Public
certification authorities and specialized certification authorities of
organizations shall publish technical specifications (documents and tool sets),
digital certificates related to certification authorities and standards for
digital signatures on websites of the certification authorities.
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Article
9. Grandfather clause
Organizations and
individuals using digital signature software and digital signature checking
software before the effective date of this Circular shall keep using them until
they are changed, upgraded or replaced shall comply with the regulations laid
down in this Circular.
Article
10. Effect
1. This Circular comes
into force from November 01, 2020.
2. Chief of Office,
National Electronic Authentication Centre, heads of agencies and units
affiliated to the Ministry of Information and Communications, Directors of
Departments of Information and Communications of provinces and
central-affiliated cities, and relevant organizations and individuals are
responsible for the implementation of this Circular.
3. Difficulties that
arise during the implementation of this Circular should be promptly reported to
the Ministry of Information and Communications (the National Electronic
Authentication Centre) for consideration and resolution./.
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APPENDIX
LIST OF TECHNICAL STANDARDS
FOR DIGITAL SIGNATURES ATTACHED TO DATA MESSAGES
(Enclosed with the Circular No. 22/2020/TT-BTTTT dated September 07, 2020 of
the Minister of Information and Communications)
No.
Type of standard
Standard code
Full name of standard
Form of application
1
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1.1
Character set and
encoding
ASCII
American Standard
Code for Information Interchange
Recommended
1.2
Coded Vietnamese
character set
TCVN
6909:2001
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Compulsory
1.3
Character set
demonstration
UTF-8
8-bit Universal
Character Set (UCS)/ Unicode Transformation Format
Recommended
1.4
Data message format
language
XML v1.0
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Extensible Markup
Language version 1.0
(5th Edition)
Compulsory application
of one of the two standards
XML v1.1
(2nd Edition)
Extensible Markup
Language version 1.1
1.5
XML Schema
Definition
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XML Schema version
1.1
Recommended
1.6
XML metadata
interchange specification
XML v2.4.2
XML Metadata
Interchange version 2.4.2
Recommended
2
Standards for digital signatures and checking of digital
signatures
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Standards for
digital signatures on private key management devices, digital signature
software, creation of digital signatures, digital certificates and digital
signature checking software.
2.1.1
Encryption
algorithms
TCVN 7816:2007
Cryptographic
technique - Cryptographic algorithms - Data Encryption Algorithm AES
Recommended
NIST 800-67
Recommendation for
the Triple Data Encryption Algorithm (TDEA) Block Cipher
Recommended
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RSA Cryptography
Standard
(Version 2.1 or
later)
Application and use
of the RSAES-OAEP scheme for encryption
A minimum of
2048-bit keys
Recommended
ECC
Elliptic Curve
Crytography
Recommended
2.1.2
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TCVN 7635:2007
Cryptography
technique - Digital signature
- Application of one
of the three standards.
- For TCVN 7635:2007
and
+ Version 2.1
+ Application of
+ A minimum of 2048-bit
keys
- For the standard
ECDSA: a minimum of 256-bit keys
PKCS#1
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ANSI X9.62-2005
Public Key
Cryptography for the Financial Services Industry: The Elliptic Curve Digital
Signature Algorithm (ECDSA)
2.1.3
Secure hash function
FIPS PUB 180-4
Secure Hash
Algorithms
Application of one
of the
SHA-224,
SHA-256,
SHA-384,
SHA-512,
SHA-512/224,
SHA-512/256,
SHA3-224,
SHA3-256,
SHA3-384,
SHA3-512, SHAKE128, SHAKE256
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SHA-3 Standard:
Permutation-Based Hash and Extendable-Output Functions
2.1.4
Secure XML message
exchange
XML Encryption
Syntax and Processing
XML Encryption
Syntax and Processing
Compulsory
XML Signature Syntax
and Processing
XML Signature Syntax
and Processing
Compulsory
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XML public key
management
XKMS v2.0
XML Key Management
Specification version 2.0
Compulsory
2.1.6
Cryptographic
message syntax for signing and encrypting
PKCS#7 v1.5 (RFC
2315)
Cryptographic
message syntax for file-based signing and encrypting version 1.5
Compulsory
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Standards for
digital signatures on the system of equipment for management of private keys
and digital certificates and remote digital signature creation
2.2.1
Policy and security
requirements for digital signature servers
ETSI TS 119 431-1
Electronic
Signatures and Infrastructures (ESI); Policy and security requirements for
trust service providers; Part 1: TSP service components operating a remote
QSCD/SCDev
Application of the 2
part standard;
Version V1.1.1
(12/2018)
ETSI TS 119 431-2
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2.2.2
Protocol for
creation of digital signatures
ETSI TS 119 432
Electronic
Signatures and Infrastructures (ESI); Protocols for remote digital signature
creation
Version V1.1.1
(03/2019)
2.2.3
Signature
application on a digital signature server
EN 419241-1:2018
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2.2.4
Requirements for
digital signature module
EN 419241-2:2019
Trustworthy Systems
Supporting Server Signing - Part 2: Protection Profile for QSCD for Server
Signing
2.2.5
Security
requirements for
EN 419221-5:2018
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3
Standards for checking digital certificate status
3.1
Protocol for
transmission and receipt of digital signatures and the Certificate Revocation
List
RFC 2585
Internet X.509
Public Key Infrastructure - Operational Protocols: FTP and HTTP
Application of
either one or both of FTP and HTTP protocols
3.2
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RFC 2560
X.509 Internet
Public Key Infrastructure - On-line Certificate status protocol