Chaumian credentials are about forty years old and still work well, provided your Issuer is willing to bear the cost of running the blind signature protocol for each credential it issues — and that the Resource doesn’t mind verifying a signature for each “show”. Protocols like PrivacyPass implement this using protocols like blind RSA signatures, so presumably these operations cost isn’t prohibitive for real-world applications. However, PrivacyPass also includes some speed optimizations for cases where the Issuer and Resource are the same entity, and these make a big difference.1
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The conflict has spread across the Middle East following US and Israeli strikes on Iran, which killed the country's supreme leader, Ayatollah Ali Khamenei. Iran has responded by launching attacks on Israel and US-allied states in the Gulf.