An OpenID Connect (OIDC) ID Token is a signed JSON Web Token (JWT) that tells an application—called the client or relying party—who authenticated and provides claims about that authentication. It is secure only when the client validates the signature and required claims against its trusted provider and configuration; decoding a JWT is not proof that it is valid.
What an ID Token means in OpenID Connect
The OpenID Foundation defines an ID Token as “a security token that contains Claims about the Authentication of an End-User by an Authorization Server when using a Client, and potentially other requested Claims.” In plain language, it is an authentication assertion issued by an identity provider for the application that requested sign-in.
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The token is represented as a JWT and carries claims—statements about the authentication or the user. The ID Token is intended for the OIDC client, not as a general-purpose credential to pass to any service.
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What the main claims establish
iss(issuer): identifies the identity provider that issued the token.sub(subject): identifies the user within that issuer. The identifier is locally unique to the issuer and is not reassigned there.aud(audience): identifies the client or clients the token is intended for. The client must confirm that its own identifier is included.exp(expiration): specifies when the token expires. A client should reject an expired token.nonce(when used): ties the returned ID Token to the authentication request that included the nonce.
NIST’s SP 800-63C, Digital Identity Guidelines: Federation and Assertions, also characterizes an OIDC ID Token as a signed JWT assertion and discusses issuer, subject, audience, and expiration claims.
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- The chip type: T5577 ID chip.Standard 125Khz ID RFID Card, Please note it can't be read before you program the chip.（CAN NOT WORK WITH ONITY SYSTEM and Proxmark3 RDV4）
- Compatible: It doesn't have pre-programmed id number, so need to write the id on it before you read. It's rewritable, and it can write in 125khz id format and H-ID WG 125khz format, can be customised to 26-bit Prox format. Compatible with T5567 T5577 EM4305.Works perfectly with HID systems and Flipper Zero. These however DO NOT work with the Keysy rfid duplicator
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How a client checks that an ID Token is valid
A client must validate the token rather than simply decode its payload. Decoding reveals the claims but does not establish that the token was issued by the expected provider, remains valid, or was meant for this client. OIDC libraries should perform the complete validation rules for the selected flow; the checks below describe the core idea.
- Use trusted provider configuration. Obtain the issuer metadata and signing keys through the identity provider configuration the client trusts. Do not choose a key or issuer based on untrusted token input.
- Verify the signature. Check it with an allowed algorithm and a verification key belonging to the expected issuer.
- Check issuer and audience. Require
issto match the configured issuer andaudto include this client’s identifier. Where the specification requires it, also checkazp(authorized party). - Enforce time limits. Reject a token whose
exphas passed and validate applicable time claims. Allow clock skew only deliberately and within the implementation’s policy. - Match the nonce when one was sent. Compare the token’s
nonceclaim with the value in the authentication request. OpenID Connect Core says clients “MUST verify” that the values match when the claim is present. - Fail closed. Treat a failed check as an authentication failure. Do not accept a decoded payload as proof of identity.
These are central checks, not a replacement for the complete requirements of the OIDC flow. The OpenID Connect Core 1.0 specification incorporating errata set 2 defines the protocol requirements. NIST describes signature validation as checking that the assertion’s signature is valid and corresponds to a verification key belonging to the sending identity provider.
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- Note: These are 125kHz key fobs (tags). If you want to add them to your lock system, please ensure that your system uses the same frequency of unencrypted 125kHz. Not compatible with other frequencies like 13.56MHz. For example, they don't work for Tuya or TTLock smart locks. Not work for encrypted systems.
- Compatible with other universal 125kHz tags like EM4100/4102. Not compatible with encrypted tags like HID, Indala, Cobra, APCiK, Paradox, Kaba, Isonas, etc.
- Read only. Not rewritable. You cannot re-program them. Each key fob is already pre-programmed with a unique ID number. The 10-digit number is engraved on the tag casing.
- Suitable for 125kHz RFID proximity access control system and ID management system. For example, add it to your RFID door lock if applicable.
- Approx. Size: 1.4*1.1*0.2 inch. Casing Material: ABS Plastic. Package includes 100 PCS.
ID Token versus access token
The important difference is the recipient and purpose, not whether the token happens to be formatted as a JWT.
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|---|---|---|
| ID Token | OIDC client | Reports authentication and carries identity-related claims. |
| Access token | Protected resource or API | Authorizes access to that resource. |
Both token types may be JWTs, but their audiences and validation rules differ. A resource server should validate an access token for its own use; an application should validate an ID Token under OIDC rules. The JWT Profile for OAuth 2.0 Access Tokens (RFC 9068) is for resource servers validating access tokens, and does not replace client-side ID Token validation.
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Why JWT format alone does not make a token secure
A JWT is a format, not a guarantee of authenticity or suitability. A token can be well-formed but have an invalid signature, come from an unexpected issuer, be expired, or be intended for a different client. The IETF’s JSON Web Token Best Current Practices (RFC 8725) documents attacks involving JWT deployments and emphasizes audience validation, including to prevent a token intended for one relying party from being accepted by another.
OIDC ID Tokens are signed; depending on the deployment, they may also be encrypted. Signing supports integrity and issuer authenticity, while encryption provides confidentiality. Neither makes correct validation optional.
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- 125KHz RFID key fob (key tag). These are 125KHZ ID cards. They are not IC card or NFC cards. Read only. Not rewritable. You can NOT use a card writer to re-program them. If you want to add these tags to your lock as new key cards, please make sure that your lock uses the same frequency of unencrypted 125kHz. Not work for other frequencies like 13.56MHz. For example, they don't work for Tuya or TTLock smart locks. Not work for encrypted systems.
- Compatible with other universal 125KHz tags like EM4100/4102. Not compatible with encrypted tags like HID, Indala, Cobra, APCiK, Paradox, Kaba, Isonas, etc.
- Suitable for 125KHz RFID proximity access control system and ID management system. For example, add it to your RFID door lock if applicable.
- Each key fob is pre-programmed with a unique ID number. The 10-digit number is engraved on the tag casing.
- Approx. Fob Size: 1.58*1.26*0.18 inch. Casing Material: ABS Plastic. Color: Black. Package includes 100 PCS.
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- Standard 125Khz ID RFID keyfob, support 125khz proximity ID cards token tag duplication. Frequency : 125kHz; Sensing Distance: 2.5 to 10 cm (1 to 4 inch); Data Storage Life: 10 Years
- Note: These are blank key tags without pre-programmed card numbers. You cannot directly add them to RFID locks or use a card reader to read them. Before using, please write data(card numbers) into them by a 125kHz RFID card writer first.
- Product Size: 40*30*4mm(1.57*1.18*0.16 inch). High-Quality Copper Coil inside. Casing Material: ABS Plastic. Waterproof and heat-resistant.
- Chip: ATMEL T5577 (compatible with other universal 125kHz tags). Frequency: 125kHz; It's rewritable, and it can write in 125khz id format and H-ID WG 125khz format, can be customised to 26-bit Prox format. Compatible with T5567 T5577 EM4305.
- Applications: Hotel key chain, Access control systems, time attendance system, ticketing, packing card. This T5577 proximity key card can copy duplicate em4100 TK4100 ID Card Keychains tags.
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