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Deposit – (Purse) (cf. Bank Deposit) The sending, by the Purse, of (a number of) ecash Coins to the ecash Account. These may be Coins which have been received as Payment (i.e.
'Deposit Payment') or Coins stored on the Purse-holder's hard disk and not spent(i.e. 'Deposit Cash'). The Purse software also renews any expired Coins by Depositing them at the Mint and making an equivalent Withdrawal.

Digital Signature – A technique using Public Key Cryptography that allows one party (the signer) to attach a digital signature to a (digital) message. The signature can only be created by the signer, and all other parties in the system can verify that the message was indeed signed by the signer. Digital signatures are mainly used to provide Authentication.

Disable Account – Although some clients can access this function via the Abandon Trial routine, the bank is usually directly responsible for the ecash Account status recorded at the Mint. It can be changed using the various Mint Management interfaces.

Email Address – If you wish to change email addresses you should inform your Issuer (whose policy may require that the Account ID is also changed accordingly). Merchants are assigned a more complete corporate description as ID. An Account ID such as 'J.R. Smith (Engineering) Ltd.' is a clearer identifier than the accompanying email address (e.g. [email protected]) and helps to ensure that customers send their Payments to clearly identified Merchants.

Encryption – Process by which information is encoded , so that it can only be read by the holder of the appropriate decryption key. Encryption is used to provide confidentiality of messages.

Error Codes – Error codes comprise an explanatory message and (in some clients) a numerical reference. The online help page refers the browser to an explanatory text for each message. Error codes are also listed in the Purse User manual.
(Purse) Event Log – The log which records the message exchanges and protocol execution of the ecash client. This log is useful when an error appears to have occurred and can be accessed from the ecash software in most instances.
(Mint) Event Log – Log which records the activity of the Mint, unsuccessful attempts to contact it and aborted protocols. It also maintains a list of completed transactions.
Expired Coins – Coins which have passed their pre-determined expiration date are detected by the Purse software. They are automatically exchanged for fresh coins during the next
Withdrawal or Deposit transaction (or manually when the 'Refresh Coins' function is used).

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Payment – The process of sending a Payment instrument from the Purse to the Merchant, and acknowledgment of the Payment by returning a message to the Purse.
Payment Description – A descriptive string chosen by the Purse-holder and coupled to a Payment. The Payment Description is shown to the Payee (and appears in the Transaction Logs of both parties) and may be used to identify the Payer (if desired) or to provide a text to accompany the Payment.

Payment Request – A message requesting Payment of a specified amount which is sent by a Merchant Purse-holder. The Payment Request includes details of the Account to which Payment should be sent and, in the message field, may include specifications of the goods or services which will be supplied in exchange. The recipient needs only click on one button to agree to Payment and the rest of the process can be handled automatically.
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