G - Physics – 07 – F
Patent
G - Physics
07
F
G07F 7/08 (2006.01) G07F 7/10 (2006.01)
Patent
CA 2256009
A value transfer system of at least one VCD (=Value Carrying Device) (1) and at least one VAD (=Value Accepting Device) (2), the VAD (2) having a memory (53) for storing at least an aggregate value (28) of previous accepted values and means for transferring a claiming message (13), the VCD (1) having a memory (52) for storing at least a balance value (7) and means for transferring a proving message (14), wherein the VAD (2) includes into the claiming message (13) a transaction value (20), a previous aggregate value (21) and a corresponding previously computed proving cryptogram (22), the VCD (1) computes and includes into the electronic message (14) a transaction proving cryptogram (35), computed on the basis of the previous aggregate value (21), the corresponding previously computed proving cryptogram (22) and the transaction value (20), and the VCD (1) computes the at least one transaction proving cryptogram (35) only if it has established the correctness of the received previous aggregate value (21) by using said corresponding previously computed cryptogram (22) and after it has reduced the balance value (7) with the transaction value (20).
L'invention concerne un système de transfert de valeurs d'au moins un dispositif porteur de valeurs (1) ou "VCD" (Value Carrying Device) et d'au moins un dispositif preneur de valeurs (2) ou "VAD" (Value Accepting Device). Le VAD (2) possède une mémoire (53) destinée à stocker au moins le montant total (28) de valeurs précédemment reçues et un dispositif de transfert de message de réclamation (13). Le VCD (1) comporte une mémoire (52) destinée à stocker au moins une valeur de solde (7) et un dispositif de transfert de message de vérification (14). Le VAD (2) inclut dans le message de réclamation (13) une valeur de transaction (20), un montant total antérieur (21) et un cryptogramme de vérification correspondant, préalablement calculé (22). Le VCD (1) calcule et inclut dans le message électronique (14) un cryptogramme de vérification de transaction (35) calculé sur la base du montant total antérieur (21), le cryptogramme de vérification correspondant, préalablement calculé (22) et la valeur de transaction (20). Le VCD (1) calcule ensuite au moins le cryptogramme de vérification de transaction (35) uniquement s'il a établi l'exactitude du montant total précédemment reçu (21) à l'aide du cryptogramme correspondant, préalablement calculé (22) et après avoir réduit la valeur du solde (7) de la valeur de transaction (20).
de Jong Eduard Karel
Stanford Christopher John
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
de Jong Eduard Karel
Stanford Christopher John
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