Title:
デジタルカメラ
Document Type and Number:
Japanese Patent JP4251680
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a digital camera in which the proving strength of photographed picture data can be improved. SOLUTION: When a shutter button is pressed, a CPU 4 obtains a time from a timer, and stores it in an RAM 3, and obtains photographic picture data from a CCD 1, and houses the data in the RAM 3, and compresses the housed picture data. Also, the CPU 4 extracts a sequence number from an EEPROM 5, and records a sequence number obtained by adding 1 to the sequence number in the EEPROM 5. The sequence number and the time data are added to the leading of the compressed picture data. A message digest using a message digest algorithm is calculated for the prepared picture information. A secret key is read from the EEPROM 5, and the message digest is enciphered. The obtained signature is added to the tail of the previous picture information so that a group of photographic information can be obtained, and recorded in an outside memory 8.
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Inventors:
Yoichi Kanai
Masuyoshi Taniuchida
Mieko Numazawa
Masuyoshi Taniuchida
Mieko Numazawa
Application Number:
JP3542198A
Publication Date:
April 08, 2009
Filing Date:
February 02, 1998
Export Citation:
Assignee:
株式会社リコー
International Classes:
G09C1/00; H04N5/765; G06F12/14; G06F21/10; G06F21/64; H04L9/32; H04N5/225; H04N5/232; H04N5/781; H04N5/915
Domestic Patent References:
| JP750827A | ||||
| JP1028116A | ||||
| JP103257A | ||||
| JP9261218A | ||||
| JP738555A |
Attorney, Agent or Firm:
Akinaka Takano