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V2EX  ›  问与答

如何反哈希值或者知道如何生成随机数类似的公式

  •  
  •   xianlin · 2016-08-02 10:29:43 +08:00 · 2086 次点击
    这是一个创建于 2835 天前的主题,其中的信息可能已经有所发展或是发生改变。

    也不知道这个是不是哈希得来的,希望兄弟们可以帮忙看看,出出主意。

    https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-07/1002_0953_20160802100400_0c37f9.jpg
    

    以上是一个图片链连, 1002_0953_20160802100400_0c37f9.jpg

    1002 —— 0953 是不变的,代表摄像头吧

    20160802100400 代表 YYYYMMDDHHMMSS

    0c37f9 是个随机生成的 6 位字符串或者哈希值,

    现在如果我能够了解这个值是如何得来的,就可以直接去 AWS 下载图片了,兄弟们有没有高见?可以把时间戳和摄像头哈希成 6 位的字符么?我用的哈希都是比这个 6 位数长的,不好意思,对这个不熟。

    API 文档在 这里

    以下是 API 的输出,可以看到所以图片的链接都是有个随机数在后面的。

     "odata.metadata": "http://datamall2.mytransport.sg/ltaodataservice/$metadata#CameraImageSet",
        "value": [
            {
                "CameraID": "1001",
                "Latitude": 1.29531332,
                "Longitude": 103.871146,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/1001_1008_20160802101200_9d8b5b.jpg"
            },
            {
                "CameraID": "1002",
                "Latitude": 1.319541067,
                "Longitude": 103.8785627,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/1002_0953_20160802101200_36a753.jpg"
            },
            {
                "CameraID": "1003",
                "Latitude": 1.323957439,
                "Longitude": 103.8728576,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/1003_0953_20160802101000_93254d.jpg"
            },
            {
                "CameraID": "1004",
                "Latitude": 1.319535712,
                "Longitude": 103.8750668,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/1004_0953_20160802101201_b172d8.jpg"
            },
            {
                "CameraID": "1005",
                "Latitude": 1.363519886,
                "Longitude": 103.905394,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/1005_1008_20160802101201_9c9636.jpg"
            },
            {
                "CameraID": "1006",
                "Latitude": 1.357098686,
                "Longitude": 103.902042,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/1006_1003_20160802101001_74ae66.jpg"
            },
            {
                "CameraID": "1501",
                "Latitude": 1.27414394350065,
                "Longitude": 103.851316802547,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/1501_1003_20160802101201_09c088.jpg"
            },
            {
                "CameraID": "1502",
                "Latitude": 1.27135090682664,
                "Longitude": 103.861828440597,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/1502_1003_20160802101201_504789.jpg"
            },
            {
                "CameraID": "1503",
                "Latitude": 1.27066408655104,
                "Longitude": 103.856977943394,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/1503_1003_20160802101200_52cdb2.jpg"
            },
            {
                "CameraID": "1504",
                "Latitude": 1.29409891409364,
                "Longitude": 103.876056196568,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/1504_0938_20160802101201_37aa6b.jpg"
            },
            {
                "CameraID": "1505",
                "Latitude": 1.2752977149006,
                "Longitude": 103.866390381759,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/1505_1008_20160802101201_8d709f.jpg"
            },
            {
                "CameraID": "1701",
                "Latitude": 1.323604823,
                "Longitude": 103.8587802,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/1701_1006_20160802101300_46a943.jpg"
            },
            {
                "CameraID": "1702",
                "Latitude": 1.34355015,
                "Longitude": 103.8601984,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/1702_1009_20160802101300_66674d.jpg"
            },
            {
                "CameraID": "1703",
                "Latitude": 1.32814722194857,
                "Longitude": 103.862203282048,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/1703_1010_20160802101201_b2799f.jpg"
            },
            {
                "CameraID": "1704",
                "Latitude": 1.28569398886979,
                "Longitude": 103.837524510188,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/1704_1011_20160802101300_43bee7.jpg"
            },
            {
                "CameraID": "1705",
                "Latitude": 1.375925022,
                "Longitude": 103.8587986,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/1705_1011_20160802101300_0221c2.jpg"
            },
            {
                "CameraID": "1706",
                "Latitude": 1.38861,
                "Longitude": 103.85806,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/1706_1010_20160802101300_53ef7e.jpg"
            },
            {
                "CameraID": "1707",
                "Latitude": 1.28036584335876,
                "Longitude": 103.830451146503,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/1707_1010_20160802101300_96145f.jpg"
            },
            {
                "CameraID": "1709",
                "Latitude": 1.31384231654635,
                "Longitude": 103.845603032574,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/1709_1012_20160802101300_236a5c.jpg"
            },
            {
                "CameraID": "1711",
                "Latitude": 1.35296,
                "Longitude": 103.85719,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/1711_1011_20160802101300_6509c5.jpg"
            },
            {
                "CameraID": "2701",
                "Latitude": 1.447023728,
                "Longitude": 103.7716543,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/2701_1009_20160802101300_17b27a.jpg"
            },
            {
                "CameraID": "2702",
                "Latitude": 1.445554109,
                "Longitude": 103.7683397,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/2702_1012_20160802101300_cebe1b.jpg"
            },
            {
                "CameraID": "2703",
                "Latitude": 1.35047790791386,
                "Longitude": 103.791033581325,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/2703_1010_20160802101201_0645b0.jpg"
            },
            {
                "CameraID": "2704",
                "Latitude": 1.429588536,
                "Longitude": 103.769311,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/2704_1008_20160802101202_c013c4.jpg"
            },
            {
                "CameraID": "2705",
                "Latitude": 1.36728572,
                "Longitude": 103.7794698,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/2705_1010_20160802101201_b45a63.jpg"
            },
            {
                "CameraID": "3702",
                "Latitude": 1.33831,
                "Longitude": 103.98032,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/3702_1010_20160802101202_70004b.jpg"
            },
            {
                "CameraID": "3704",
                "Latitude": 1.2958550156561,
                "Longitude": 103.880314665981,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/3704_1010_20160802101201_ddf222.jpg"
            },
            {
                "CameraID": "3705",
                "Latitude": 1.32743,
                "Longitude": 103.97383,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/3705_1010_20160802101202_940482.jpg"
            },
            {
                "CameraID": "3793",
                "Latitude": 1.309330837,
                "Longitude": 103.9350504,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/3793_1010_20160802101201_0495a2.jpg"
            },
            {
                "CameraID": "3795",
                "Latitude": 1.30145145166066,
                "Longitude": 103.910596320237,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/3795_1010_20160802101202_9389b3.jpg"
            },
            {
                "CameraID": "3796",
                "Latitude": 1.297512569,
                "Longitude": 103.8983019,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/3796_1010_20160802101201_0671e8.jpg"
            },
            {
                "CameraID": "3797",
                "Latitude": 1.29565733262976,
                "Longitude": 103.885283049309,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/3797_1011_20160802101202_a8da2c.jpg"
            },
            {
                "CameraID": "3798",
                "Latitude": 1.29158484,
                "Longitude": 103.8615987,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/3798_1010_20160802101201_c0e278.jpg"
            },
            {
                "CameraID": "4701",
                "Latitude": 1.2871,
                "Longitude": 103.79633,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/4701_1008_20160802101202_5f569e.jpg"
            },
            {
                "CameraID": "4702",
                "Latitude": 1.27237,
                "Longitude": 103.8324,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/4702_1010_20160802101201_525f4c.jpg"
            },
            {
                "CameraID": "4703",
                "Latitude": 1.348697862,
                "Longitude": 103.6350413,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/4703_1009_20160802101300_245a7e.jpg"
            },
            {
                "CameraID": "4704",
                "Latitude": 1.27877,
                "Longitude": 103.82375,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/4704_1009_20160802101201_5c9ee1.jpg"
            },
            {
                "CameraID": "4705",
                "Latitude": 1.32618,
                "Longitude": 103.73028,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/4705_1010_20160802101202_2c2111.jpg"
            },
            {
                "CameraID": "4706",
                "Latitude": 1.29792,
                "Longitude": 103.78205,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/4706_1010_20160802101202_17ab81.jpg"
            },
            {
                "CameraID": "4707",
                "Latitude": 1.33344648135658,
                "Longitude": 103.652700847056,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/4707_1009_20160802101203_c6fd1e.jpg"
            },
            {
                "CameraID": "4708",
                "Latitude": 1.29939,
                "Longitude": 103.7799,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/4708_1010_20160802101202_f1882b.jpg"
            },
            {
                "CameraID": "4710",
                "Latitude": 1.32153,
                "Longitude": 103.75273,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/4710_1012_20160802101300_2d8028.jpg"
            },
            {
                "CameraID": "4712",
                "Latitude": 1.341244001,
                "Longitude": 103.6439134,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/4712_1010_20160802101202_afb948.jpg"
            },
            {
                "CameraID": "4713",
                "Latitude": 1.347645829,
                "Longitude": 103.6366955,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/4713_1011_20160802101300_8bb9c7.jpg"
            },
            {
                "CameraID": "4714",
                "Latitude": 1.31023,
                "Longitude": 103.76438,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/4714_1009_20160802101203_690d16.jpg"
            },
            {
                "CameraID": "4716",
                "Latitude": 1.32227,
                "Longitude": 103.67453,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/4716_1010_20160802101203_0d7160.jpg"
            },
            {
                "CameraID": "4798",
                "Latitude": 1.25999999687243,
                "Longitude": 103.823611110166,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/4798_1011_20160802101204_f7538b.jpg"
            },
            {
                "CameraID": "4799",
                "Latitude": 1.26027777363278,
                "Longitude": 103.823888890049,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/4799_1010_20160802101204_db2424.jpg"
            },
            {
                "CameraID": "5794",
                "Latitude": 1.3309693,
                "Longitude": 103.9168616,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/5794_1010_20160802101204_7725e4.jpg"
            },
            {
                "CameraID": "5795",
                "Latitude": 1.326024822,
                "Longitude": 103.905625,
                "ImageLink": "https://s3-ap-southeast-1.amazonaws.com/mtpdm/2016-08-02/10-15/5795_1010_20160802101204_a61365.jpg"
            }
    
    2 条回复    2016-08-04 00:52:41 +08:00
    aprikyblue
        1
    aprikyblue  
       2016-08-02 10:42:31 +08:00 via Android
    ... 你确认这是哈希而不是随机字符串?
    xianlin
        2
    xianlin  
    OP
       2016-08-04 00:52:41 +08:00
    不确定啊,如果是随机的串那就更不好办了,无解了吧。
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