Expired50% confidenceFactTime unknown
The CO value in Tencent's slider CAPTCHA is the core encrypted ciphertext, generated by local JS, with a length of approximately 1,600–1,700 characters.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
Valid until: 9/30/2026(expired)
Sources
Related Claims
UnverifiedThe core encryption logic of Tencent's slider CAPTCHA is located in the tdcgs file, and the CO value encryption call chain is: o.getTCDData() → URL decode → obtain the CO ciphertext value.70% similarUnverifiedWeb Crypto API提供AES-GCM、RSA-OAEP、ECDH等标准密码学原语，运算在浏览器底层执行，不暴露密钥给JavaScript运行时66% similarUnverifiedJD.com's H5ST encryption parameter value exceeds 1,000 characters and has a complex structure.65% similarUnverifiedCryptoJS can be identified by the C.lib.WordArray data structure, the C.enc.Hex codec, and the namespace C.63% similarUnverifiedIn Tencent's slider CAPTCHA request flow, the EKS value is extracted from the TDC.js file and used as the encryption key.63% similar
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