After cutting off payments to Wikileaks, MasterCard Inc., Visa Inc. and PayPal Inc. have found themselves under assault.

MasterCard said its SecureCode payment verification system experienced disruptions temporarily Wednesday as part of an attack that also took out its main website by overwhelming it with high traffic. PayPal Inc. said it has been fighting a similar attack, though its website remained up. Visa said its website was inaccessible Wednesday afternoon due to high traffic.

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