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D
Data Encryption Standard (DES)
Debit advice
Debit card
Debit transfer system
Decipherment
Default
Defaulter pays
Deferred net settlement system
Delivery
Delivery-versus-payment system
Denial of service
Depository
Deterrent measures
Digital signature
Direct debit
Domestic settlement
Denial of service  

Temporary refusal to access resources or data as a result of an act of malicious intent.