(5 ILCS 175/5-105)
"Asymmetric cryptosystem" means a computer-based system capable of
using a key pair consisting of a private key for creating a digital signature
and a public key to verify the
"Certificate" means a record that at a minimum: (a) identifies the
issuing it; (b) names or otherwise identifies its subscriber or a device or
electronic agent under the
control of the subscriber; (c) contains a public key that corresponds to a
private key under the control
of the subscriber; (d) specifies its operational period; and (e) is digitally
signed by the certification
authority issuing it.
"Certification authority" means a person who authorizes and causes the
issuance of a
"Certification practice statement" is a statement published by a
that specifies the policies or practices that the certification authority
employs in issuing, managing,
suspending, and revoking certificates and providing access to them.
"Correspond", with reference to keys, means to belong to the same key
"Digital signature" means a type of electronic signature created by
electronic record using a message digest function and encrypting the resulting
transformation with an
asymmetric cryptosystem using the signer's private key such that any person
having the initial
untransformed electronic record, the encrypted transformation, and the signer's
key can accurately determine whether the transformation was created using
the private key that
corresponds to the signer's public key and whether the initial electronic
record has been altered
since the transformation was made. A digital signature is a security
"Electronic" includes electrical, digital, magnetic, optical,
electromagnetic, or any other
form of technology that entails capabilities similar to these technologies.
"Electronic record" means a record generated, communicated, received, or
electronic means for use in an information system or for transmission from one
information system to
"Electronic signature" means a signature in electronic form attached to
associated with an electronic record.
"Information" includes data, text, images, sound, codes, computer
software, databases, and the like.
"Key pair" means, in an asymmetric cryptosystem, 2 mathematically
referred to as a private key and a public key, having the properties that (i)
one key (the private key) can
encrypt a message that only the other key (the public key) can decrypt, and
(ii) even knowing one key
(the public key), it is computationally unfeasible to discover the other key
(the private key).
"Message digest function" means an algorithm that maps or translates
of bits comprising an electronic record into another, generally smaller, set of
bits (the message digest)
without requiring the use of any secret information such as a key, such that
an electronic record
yields the same message digest every time the algorithm is executed using such
record as input and
it is computationally unfeasible that any 2 electronic records can be found
or deliberately generated
that would produce the same message digest using the algorithm unless the 2
records are precisely
"Operational period of a certificate" begins on the date and time the
issued by a certification authority (or on a later date and time certain if
stated in the certificate) and ends
on the date and time it expires as noted in the certificate or is earlier
revoked, but does not include any
period during which a certificate is suspended.
"Person" means an individual, corporation, business trust, estate,
limited partnership, limited liability partnership, limited liability company,
association, joint venture,
government, governmental subdivision, agency, or instrumentality, or any other
legal or commercial
"Private key" means the key of a key pair used to create a digital signature.
"Public key" means the key of a key pair used to verify a digital signature.
"Record" means information that is inscribed, stored, or otherwise fixed on a
medium or that is stored in an electronic or other medium and is retrievable in
"Repository" means a system for storing and retrieving certificates or other
relevant to certificates, including information relating to the status of a
"Revoke a certificate" means to permanently end the operational period of a
certificate from a specified time forward.
"Rule of law" means any statute, ordinance, common law rule,
court decision, or other rule of law enacted, established or promulgated by the
State of Illinois, or any
agency, commission, department, court, other authority or political subdivision
of the State of Illinois.
"Security procedure" means a methodology or procedure used for the purpose of
verifying that an electronic record is that of a specific person or (2)
detecting error or alteration in
the communication, content, or storage of an electronic record since a specific
point in time. A security
procedure may require the use of algorithms or codes, identifying words or
answer back or acknowledgment procedures, or similar security devices.
"Signature device" means unique information, such as codes, algorithms,
numbers, private keys, or personal identification numbers (PINs), or a uniquely
configured physical device, that
is required, alone or in
conjunction with other information or devices, in order to create an electronic
signature attributable to a
"Signed" or "signature" includes any symbol executed or adopted, or any
procedure employed or adopted, using electronic means or otherwise, by or on
behalf of a person with
intent to authenticate a record.
"State agency" means and includes all officers, boards, commissions,
agencies created by the Illinois Constitution, whether in the executive,
judicial branch, all officers,
departments, boards, commissions, agencies, institutions, authorities,
universities, bodies politic and
corporate of the State; and administrative units or corporate outgrowths of the
State government which
are created by or pursuant to statute, other than units of local government and
their officers, school
districts and boards of election commissioners; all administrative units and
corporate outgrowths of the
above and as may be created by executive order of the Governor.
"Subscriber" means a person who is the subject named or otherwise identified
certificate, who controls a private key that corresponds to the public key
listed in that certificate, and
who is the person to whom digitally signed messages verified by reference to
such certificate are to be
"Suspend a certificate" means to temporarily suspend the operational period
certificate for a specified time period or from a specified time forward.
"Trustworthy manner" means through the use of computer hardware,
procedures that, in the context in which they are used: (a) can be shown to be
reasonably resistant to
penetration, compromise, and misuse; (b) provide a reasonable level of
reliability and correct operation;
(c) are reasonably suited to performing their intended functions or serving
their intended purposes; (d)
comply with applicable agreements between the parties, if any; and (e) adhere
to generally accepted
"Valid certificate" means a certificate that a certification
authority has issued and
that the subscriber listed in the certificate has accepted.
"Verify a digital signature" means to use the public key listed in a
along with the appropriate message digest function and asymmetric cryptosystem,
to evaluate a digitally
signed electronic record, such that the result of the process concludes that
the digital signature was
created using the private key corresponding to the public key listed in the
certificate and the
electronic record has not been altered since its digital signature was created.
(Source: P.A. 90-759, eff. 7-1-99.)