membphis commented on PR #13699:
URL: https://github.com/apache/apisix/pull/13699#issuecomment-5029480220

   [P2] GCP token cache key can alias different credentials and TTL policies
   
   The new cache key uses `ngx.crc32_long(service_account_json) .. "#" .. 
name`. Because it relies on a 32-bit CRC and omits `expire_early_secs` and 
`max_ttl`, separate configurations can alias: different credentials may reuse 
the wrong cached access token after a collision, while identical credentials 
and names with different TTL policies can bypass the latter policy.
   
   Please use a collision-resistant digest of the resolved credentials and all 
fields that affect cache reuse, without logging plaintext secrets, and add 
coverage for same-name configurations with different TTL policies.


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