Barclays Execution Services Limited

George French

Jeremy Goldstone

David Taylor

This disclosure relates to a computer-implemented method, a data processing apparatus, a computer program, and a computer-readable storage medium for processing encrypted data. There is provided a computer-implemented method for processing a first ciphertext, C, wherein the first ciphertext is data encrypted with a plurality of keys, k. . . k, the method comprising: receiving a first key, k, wherein the first key is one of the plurality of keys; receiving the first ciphertext, C; and performing an exclusive OR operation on the first ciphertext, C, and the first key, k, to produce a second ciphertext, C, such that the second ciphertext, C, is the data encrypted with the plurality of keys k. . . k, and not with the first key, k.

Method for processing encrypted data

This disclosure relates to a computer-implemented method, a data processing apparatus, a computer program, and a computer-readable storage medium for processing encrypted data. There is provided a computer-implemented method for processing encrypted data, comprising receiving a swap key, wherein the swap key is the product of an exclusive OR operation performed on a first key and a second key; receiving a first ciphertext, wherein the first ciphertext is encrypted with the first key and not encrypted with the second key; and performing an exclusive OR operation on the swap key and the first ciphertext to produce second ciphertext, such that the second ciphertext is encrypted with the second key and not encrypted with the first key.

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London, United Kingdom

George French